CN120121465B - Ultrasonic surface density measurement method, system and equipment - Google Patents
Ultrasonic surface density measurement method, system and equipmentInfo
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- CN120121465B CN120121465B CN202510600435.8A CN202510600435A CN120121465B CN 120121465 B CN120121465 B CN 120121465B CN 202510600435 A CN202510600435 A CN 202510600435A CN 120121465 B CN120121465 B CN 120121465B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/24—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing the transmission of wave or particle radiation through the material
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
本发明提供了一种超声波面密度测量方法、系统及设备，涉及超声波测量领域，该方法利用多个采样点能够精确计算出超声波信号的偏移角，从而在超声波面密度测量设备的使用过程中因待测物体移动导致的采集点偏移进行实时信号补偿，从而显著提高测量精度，提升生产效率。
The present invention provides an ultrasonic surface density measurement method, system and equipment, which relate to the field of ultrasonic measurement. The method uses multiple sampling points to accurately calculate the deviation angle of the ultrasonic signal, thereby performing real-time signal compensation for the sampling point deviation caused by the movement of the object to be measured during the use of the ultrasonic surface density measurement equipment, thereby significantly improving measurement accuracy and enhancing production efficiency.
Description
Technical Field
The invention relates to the field of ultrasonic measurement, in particular to an ultrasonic surface density measurement method, an ultrasonic surface density measurement system and ultrasonic surface density measurement equipment.
Background
In the process of measuring the surface density by utilizing ultrasonic waves, the accuracy of signal acquisition is important for the accurate measurement of the surface density of an object to be measured. However, in the practical application scene, the state of the object to be measured is very complex, taking a pole piece with a stripe coating as an example, and the surface density of the pole piece is in a continuously changing state in the moving process. When the ultrasonic surface density measuring device is used for measuring the ultrasonic surface density measuring device, the ultrasonic surface density measuring device can acquire pole piece data in different states due to the motion of the pole piece and the structural characteristics of the ultrasonic surface density measuring device. Because of the difference of the reflection characteristics of the pole pieces in different states on ultrasonic waves, the point where signals are acquired inevitably shifts, and the shift shows a certain angle change. Such angular offset can severely interfere with measurement accuracy. For example, on a lithium battery pole piece production line, the pole piece continuously moves at a certain speed, and the real surface density of the pole piece cannot be accurately reflected due to the change of the pole piece state and the offset of the acquisition point of the data acquired by the ultrasonic surface density measuring device.
The traditional processing mode often lacks enough attention to the problem of angular offset of the acquisition point caused by the state change and the movement of the pole piece, and even if the problem is realized, the problem is also lacking in an effective solution, so that a larger deviation is generated between the measurement result and the actual surface density of the pole piece. The produced lithium battery pole piece is possibly not in accordance with the quality standard, the performance and the safety of the lithium battery are affected, the quality problem of a series of subsequent production links is also caused, the production cost is greatly increased, and the production efficiency is reduced.
Disclosure of Invention
Accordingly, the present invention is directed to a method, a system, and an apparatus for measuring ultrasonic surface density, which accurately calculate an offset angle of an ultrasonic signal by using a plurality of sampling points, so that the offset of the sampling points caused by the movement of an object to be measured is compensated in real time during the use of the ultrasonic surface density measuring apparatus, thereby remarkably improving the measurement accuracy and the production efficiency.
In a first aspect, an embodiment of the present invention provides an ultrasonic surface density measurement method, where the method is applied to an ultrasonic surface density measurement device, and the method includes:
controlling ultrasonic surface density measuring equipment to emit pulse ultrasonic waves to an object to be measured according to preset emission frequency, and controlling a receiving transducer in the ultrasonic surface density measuring equipment to receive ultrasonic signals passing through the object to be measured in real time;
Collecting a plurality of sampling points in a single period of an ultrasonic signal based on the collection parameters corresponding to the receiving transducer, and determining the sampling point with the largest amplitude in the plurality of sampling points as a first sampling point;
determining a second sampling point adjacent to the first sampling point, and calculating an offset angle of the ultrasonic signal according to the coordinate data of the first sampling point and the second sampling point;
And generating an angle compensation strategy of the object to be measured through the offset angle, and controlling ultrasonic surface density measurement equipment to measure the surface density of the object to be measured based on the angle compensation strategy.
Optionally, controlling the ultrasonic surface density measurement device to emit pulsed ultrasonic waves to the object to be measured according to a preset emission frequency, including:
initializing an ultrasonic amplitude coefficient and a standard sample corresponding to ultrasonic surface density measurement equipment;
Acquiring calibration measurement data of the ultrasonic surface density measurement equipment on a standard sample, and determining an ultrasonic amplitude coefficient of the ultrasonic surface density measurement equipment by using the calibration measurement data;
Based on the ultrasonic amplitude coefficient, controlling ultrasonic surface density measuring equipment to emit pulse ultrasonic waves to an object to be measured according to a preset emission frequency, wherein the waveform of an ultrasonic signal which is received by a receiving transducer in real time and passes through the object to be measured is spindle-shaped.
Optionally, controlling a receiving transducer in the ultrasonic surface density measurement device to receive in real time an ultrasonic signal after passing through the object to be measured includes:
Acquiring a receiving transducer contained in ultrasonic surface density measurement equipment, and determining the acquisition frequency of the receiving transducer;
the analog-digital converter in the receiving transducer is controlled by the acquisition frequency to receive the ultrasonic signal of the ultrasonic wave passing through the object to be detected in real time.
Optionally, collecting a plurality of sampling points in a single period of the ultrasonic signal based on the collection parameters corresponding to the receiving transducer, and determining a sampling point with the largest amplitude among the plurality of sampling points as the first sampling point, including:
Determining a pulse width modulation curve corresponding to ultrasonic surface density measuring equipment by utilizing the acquisition frequency corresponding to the receiving transducer;
acquiring a corresponding pulse width in a pulse width modulation curve, and determining acquisition parameters based on the pulse width;
and determining a cosine curve corresponding to a single period in the ultrasonic signal, acquiring a plurality of sampling points in the cosine curve by utilizing the acquisition parameters, and determining the sampling point with the largest amplitude in the plurality of sampling points as a first sampling point.
Optionally, determining a second sampling point adjacent to the first sampling point, and calculating an offset angle of the ultrasonic signal according to coordinate data of the first sampling point and the second sampling point includes:
According to the propagation direction of the ultrasonic signal, determining the adjacent sampling point of the first sampling point as a second sampling point;
Respectively acquiring sampling point coordinate values corresponding to the first sampling point and the second sampling point by utilizing a coordinate system corresponding to the cosine curve;
Determining sampling point phase angles corresponding to the first sampling point and the second sampling point based on the acquisition parameters;
And calculating the offset angle of the ultrasonic signal through the coordinate value of the sampling point and the phase angle of the sampling point.
Optionally, calculating an offset angle of the ultrasonic signal by using the coordinate value of the sampling point and the phase angle of the sampling point, and calculating the offset angle by using the following formula:
;
Wherein, the Is the offset angle; And The ordinate coordinates of the first sampling point and the second sampling point in the coordinate system are corresponding respectively.
Optionally, generating an angle compensation strategy of the object to be measured through the offset angle, and controlling the ultrasonic surface density measurement device to measure the surface density of the object to be measured based on the angle compensation strategy, including:
determining the amplitude position of the cosine curve based on a coordinate system corresponding to the cosine curve, and determining the phase difference between the first sampling point and the amplitude position;
Generating an angle compensation strategy of an object to be measured by using the offset angle and the phase difference, and generating measurement parameters corresponding to the ultrasonic surface density measurement equipment based on the angle compensation strategy, so that a first sampling point of the ultrasonic surface density measurement equipment coincides with the amplitude position under the current measurement parameters;
and controlling ultrasonic surface density measuring equipment by using the measuring parameters to measure the surface density of the object to be measured.
Optionally, the signal curve corresponding to the ultrasonic signal is:
wherein A is the amplitude corresponding to the ultrasonic signal; Is a bandwidth factor; is the arrival time of the ultrasonic signal; Is the angular frequency; is the phase angle, y is the ordinate of the coordinate system corresponding to the ultrasonic signal, and t is the abscissa of the coordinate system corresponding to the ultrasonic signal.
In a second aspect, the present invention provides an ultrasonic areal density measurement system for use in an ultrasonic areal density measurement apparatus, the system comprising:
The initialization module is used for controlling the ultrasonic surface density measurement equipment to emit pulse ultrasonic waves to the object to be measured according to the preset emission frequency, and controlling the receiving transducer in the ultrasonic surface density measurement equipment to receive the ultrasonic signals passing through the object to be measured in real time;
The sampling point determining module is used for acquiring a plurality of sampling points in a single period of the ultrasonic signal based on the acquisition parameters corresponding to the receiving transducer, and determining the sampling point with the largest amplitude in the plurality of sampling points as a first sampling point;
The offset angle calculation module is used for determining a second sampling point adjacent to the first sampling point and calculating an offset angle of the ultrasonic signal according to coordinate data of the first sampling point and the second sampling point;
The measurement execution module is used for generating an angle compensation strategy of the object to be measured through the offset angle and controlling the ultrasonic surface density measurement equipment to measure the surface density of the object to be measured based on the angle compensation strategy.
In a third aspect, embodiments of the present invention also provide an ultrasonic areal density measurement apparatus comprising a processor and a memory, the memory storing computer executable instructions executable by the processor, the processor executing the computer executable instructions to implement the steps of the ultrasonic areal density measurement method provided in the first aspect.
In a fourth aspect, embodiments of the present invention also provide a storage medium storing computer-executable instructions that, when invoked and executed by a processor, cause the processor to implement the steps of the ultrasonic areal density measurement method provided in the first aspect.
In the process of measuring the surface density of an object to be measured by utilizing ultrasonic surface density measuring equipment, firstly, controlling the ultrasonic surface density measuring equipment to emit pulse ultrasonic waves to the object to be measured according to preset emission frequency, controlling a receiving transducer in the ultrasonic surface density measuring equipment to receive ultrasonic signals passing through the object to be measured in real time, then, acquiring a plurality of sampling points in a single period of the ultrasonic signals based on acquisition parameters corresponding to the receiving transducer, determining the sampling point with the largest amplitude in the plurality of sampling points as a first sampling point, then, determining a second sampling point adjacent to the first sampling point, calculating the offset angle of the ultrasonic signals according to coordinate data of the first sampling point and the second sampling point, finally, generating an angle compensation strategy of the object to be measured through the offset angle, and controlling the ultrasonic surface density measuring equipment to measure the surface density of the object to be measured based on the angle compensation strategy. The method utilizes a plurality of sampling points to accurately calculate the offset angle of the ultrasonic wave signals, so that the offset of the acquisition points caused by the movement of the object to be measured is compensated in real time in the use process of the ultrasonic wave surface density measuring equipment, thereby obviously improving the measuring precision and the production efficiency.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of an ultrasonic surface density measurement method according to an embodiment of the present invention;
FIG. 2 is a flowchart of controlling ultrasonic surface density measurement equipment to emit pulsed ultrasonic waves to an object to be measured according to a preset emission frequency in an ultrasonic surface density measurement method according to an embodiment of the present invention;
FIG. 3 is a flowchart of controlling a receiving transducer in an ultrasonic surface density measurement device to receive an ultrasonic signal of an ultrasonic wave passing through an object to be measured in real time in an ultrasonic surface density measurement method according to an embodiment of the present invention;
fig. 4 is a flowchart of step S102 in an ultrasonic surface density measurement method according to an embodiment of the present invention;
FIG. 5 is a flowchart of step S103 in an ultrasonic surface density measurement method according to an embodiment of the present invention;
FIG. 6 is a flowchart of step S104 in an ultrasonic surface density measurement method according to an embodiment of the present invention;
Fig. 7 is a cosine curve waveform diagram in an ultrasonic surface density measurement method according to an embodiment of the present invention;
FIG. 8 is a flowchart of another ultrasonic surface density measurement method according to an embodiment of the present invention;
FIG. 9 is a graph showing the effect of an angle compensation strategy of an ultrasonic surface density measurement method according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of an ultrasonic surface density measurement system according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of an ultrasonic surface density measurement device according to an embodiment of the present invention.
Icon:
1010-an initialization module, 1020-a sampling point determination module, 1030-an offset angle calculation module and 1040-a measurement execution module;
101-processor, 102-memory, 103-bus, 104-communication interface.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the process of measuring the surface density by utilizing ultrasonic waves, the accuracy of signal acquisition is important for the accurate measurement of the surface density of an object to be measured. However, in the practical application scene, the state of the object to be measured is very complex, taking a pole piece with a stripe coating as an example, and the surface density of the pole piece is in a continuously changing state in the moving process. When the ultrasonic surface density measuring device is used for measuring the ultrasonic surface density measuring device, the ultrasonic surface density measuring device can acquire pole piece data in different states due to the motion of the pole piece and the structural characteristics of the ultrasonic surface density measuring device. Because of the difference of the reflection characteristics of the pole pieces in different states on ultrasonic waves, the point where signals are acquired inevitably shifts, and the shift shows a certain angle change. Such angular offset can severely interfere with measurement accuracy. For example, on a lithium battery pole piece production line, the pole piece continuously moves at a certain speed, and the real surface density of the pole piece cannot be accurately reflected due to the change of the pole piece state and the offset of the acquisition point of the data acquired by the ultrasonic surface density measuring device.
The traditional processing mode often lacks enough attention to the problem of angular offset of the acquisition point caused by the state change and the movement of the pole piece, and even if the problem is realized, the problem is also lacking in an effective solution, so that a larger deviation is generated between the measurement result and the actual surface density of the pole piece. The produced lithium battery pole piece is possibly not in accordance with the quality standard, the performance and the safety of the lithium battery are affected, the quality problem of a series of subsequent production links is also caused, the production cost is greatly increased, and the production efficiency is reduced.
With the continuous development of the lithium battery industry and other industries with strict requirements on the surface density precision, the precision requirements on the ultrasonic surface density measurement technology are also increasingly improved. How to properly solve the problem that the accuracy is affected by the offset of the acquisition point caused by the change and movement of the surface density of the object to be measured is a key technical problem which is urgent to overcome in the technical field of ultrasonic surface density measurement. Based on the above, the invention provides an ultrasonic surface density measurement method, an ultrasonic surface density measurement system and ultrasonic surface density measurement equipment, wherein the method utilizes a plurality of sampling points to accurately calculate the offset angle of ultrasonic signals, so that the offset of the sampling points caused by the movement of an object to be measured is compensated in real time in the use process of the ultrasonic surface density measurement equipment, thereby remarkably improving the measurement precision and the production efficiency.
For the sake of understanding the present embodiment, first, a detailed description will be given of an ultrasonic surface density measurement method disclosed in the present embodiment, where the method is applied to an ultrasonic surface density measurement device, as shown in fig. 1, and the method includes:
step S101, controlling ultrasonic surface density measuring equipment to emit pulse ultrasonic waves to an object to be measured according to preset emission frequency, and controlling a receiving transducer in the ultrasonic surface density measuring equipment to receive ultrasonic signals passing through the object to be measured in real time.
In practical application, the selection of the preset emission frequency needs to comprehensively consider factors such as the material, thickness, structure and the like of the object to be measured. For example, for a denser, thicker object, a higher transmit frequency may be selected to ensure that ultrasound can penetrate the object, while for a less dense, thinner object, a lower transmit frequency may be selected to improve the accuracy of the measurement. Typically, the predetermined transmit frequency may range between tens of kilohertz and several megahertz.
When controlling an ultrasonic surface density measuring device to emit pulsed ultrasonic waves to an object to be measured, it is necessary to ensure that the emitted ultrasonic waves have sufficient energy and stability. This can be achieved by precise control of the power, pulse width etc. parameters of the measuring device. Meanwhile, after the ultrasonic wave is transmitted, the real-time receiving function of the receiving transducer is started in time, so that the ultrasonic wave signal passing through the object to be detected can be accurately received.
A receiving transducer is a device that converts a received ultrasonic signal into an electrical signal that when applied to the piezoelectric material of the transducer causes mechanical vibration of the piezoelectric material, thereby producing a corresponding electrical signal. In the process of receiving ultrasonic signals in real time, it is necessary to ensure that the sensitivity and frequency response range of the receiving transducer are matched with those of the transmitted ultrasonic signals so as to improve the receiving quality of the signals.
Step S102, a plurality of sampling points are acquired in a single period of the ultrasonic signal based on the acquisition parameters corresponding to the receiving transducer, and the sampling point with the largest amplitude in the plurality of sampling points is determined as a first sampling point.
The acquisition parameters corresponding to the receiving transducer comprise sampling frequency, sampling time and the like. In a specific scenario, the sampling frequency should be selected to satisfy the nyquist sampling theorem, i.e. the sampling frequency should be at least twice the highest frequency of the ultrasonic signal, so as to avoid signal aliasing. The setting of the sampling time is determined according to the period of the ultrasonic signal and the measurement accuracy requirement, and generally, enough sampling points can be acquired in one signal period.
And (3) sampling the ultrasonic signal at equal intervals through the receiving transducer according to the set acquisition parameters in a single period of the ultrasonic signal to obtain a plurality of sampling points. The amplitude of the electrical signal at these sampling points reflects the intensity of the ultrasonic wave at different times. And analyzing the acquired multiple sampling points, finding out the sampling point with the largest amplitude, and determining the sampling point as a first sampling point. The sampling point with the greatest amplitude usually corresponds to the peak position of the ultrasonic signal, in particular for the subsequent measurement analysis process.
Step S103, determining a second sampling point adjacent to the first sampling point, and calculating the offset angle of the ultrasonic signal according to the coordinate data of the first sampling point and the second sampling point.
After the first sampling point is determined, a sampling point adjacent to the first sampling point is selected as a second sampling point. The adjacent sampling point may be the immediately preceding or the immediately following sampling point in time, the specific choice depending on the signal processing mode and algorithm design of the measuring device.
Each sampling point corresponds to a time coordinate and an amplitude coordinate, the time coordinate reflects the position of the sampling point in the ultrasonic signal period, and the amplitude coordinate reflects the intensity of the ultrasonic signal at the moment. Coordinate data of the first sampling point and the second sampling point can be obtained through the signal acquisition and processing process of the ultrasonic surface density measurement equipment.
The calculating process of the offset angle is realized by utilizing trigonometric function relation calculation mainly according to the coordinate data corresponding to the first sampling point and the second sampling point. The specific calculation method can adopt an arctangent function and the like, for example, the magnitude of the offset angle is obtained by calculating the ratio of the amplitude difference to the time difference of two sampling points and then taking the arctangent.
Step S104, generating an angle compensation strategy of the object to be measured through the offset angle, and controlling ultrasonic surface density measurement equipment to measure the surface density of the object to be measured based on the angle compensation strategy.
And according to the calculated offset angle, combining the principle and algorithm of ultrasonic surface density measurement to generate a corresponding angle compensation strategy. The angle compensation strategy can be to adjust the transmitting and receiving angles of the measuring device or to correct the measured data so as to eliminate the measuring error caused by the deviation of the ultrasonic wave propagation direction.
And controlling ultrasonic surface density measurement equipment to measure the surface density of the object to be measured based on the generated angle compensation strategy. In the measuring process, parameters of the measuring equipment are adjusted in real time according to an angle compensation strategy, and accuracy of a measuring result is ensured. Meanwhile, after the measurement is finished, the measured data can be further analyzed and processed to obtain an accurate surface density value of the object to be measured, so that the offset of the acquisition point caused by the movement of the object to be measured can be effectively and accurately compensated in the ultrasonic surface density measurement process, and the detection precision is improved.
Optionally, controlling the ultrasonic surface density measurement device to emit pulsed ultrasonic waves to the object to be measured according to a preset emission frequency, as shown in fig. 2, includes:
Step S201, initializing an ultrasonic amplitude coefficient and a standard sample corresponding to ultrasonic surface density measurement equipment;
step S202, obtaining calibration measurement data of the ultrasonic surface density measurement equipment on a standard sample, and determining an ultrasonic amplitude coefficient of the ultrasonic surface density measurement equipment by using the calibration measurement data;
step S203, based on the ultrasonic amplitude coefficient, controlling ultrasonic surface density measuring equipment to emit pulse ultrasonic waves to an object to be measured according to a preset emission frequency, wherein the waveform of an ultrasonic signal which is received by a receiving transducer in real time and passes through the object to be measured is spindle-shaped.
In an actual scene, before the ultrasonic surface density measurement equipment starts to work, related parameters are required to be initialized, so that amplitude coefficients related to the acquired signals are determined, and the ultrasonic surface density measurement equipment can be calibrated, and standard samples can be measured for multiple times and analyzed for data. The ultrasonic surface density measuring device is controlled to emit pulse ultrasonic waves to an object to be measured according to a preset emission frequency, so that ultrasonic signals reflected by the object to be measured can be accurately collected by the ultrasonic surface density measuring device, and cosine waveforms with spindle-shaped changes in amplitude are formed.
Optionally, controlling a receiving transducer in the ultrasonic surface density measurement device to receive in real time an ultrasonic signal after passing through an object to be measured, as shown in fig. 3, includes:
step S301, a receiving transducer contained in ultrasonic surface density measurement equipment is obtained, and the acquisition frequency of the receiving transducer is determined;
In step S302, the analog-digital converter in the receiving transducer is controlled by the acquisition frequency to receive the ultrasonic signal of the ultrasonic wave passing through the object to be measured in real time.
The ultrasonic signal receiving process is realized by means of a receiving transducer contained in ultrasonic surface density measuring equipment, the ultrasonic surface density measuring equipment is assumed to emit pulse ultrasonic waves to an object to be measured according to the emitting frequency of 100khz, the cut-off energy is attenuated when the ultrasonic waves penetrate the object to be measured, a relevant analog-digital converter of the receiving transducer is started by pulse width modulation waves with the sampling frequency of 400khz, and the waveform of the attenuated ultrasonic waves is sampled by the analog-digital converter, so that an ultrasonic signal reflected by the object to be measured is obtained.
Optionally, step S102, which acquires a plurality of sampling points in a single period of the ultrasonic signal based on the acquisition parameters corresponding to the receiving transducer, and determines a sampling point with the largest amplitude among the plurality of sampling points as a first sampling point, includes, as shown in fig. 4:
Step S401, determining a pulse width modulation curve corresponding to ultrasonic surface density measuring equipment by utilizing the acquisition frequency corresponding to the receiving transducer;
step S402, acquiring a corresponding pulse width in a pulse width modulation curve, and determining acquisition parameters based on the pulse width;
Step S403, a cosine curve corresponding to a single period in the ultrasonic signal is determined, a plurality of sampling points are collected in the cosine curve by utilizing the collection parameter, and a sampling point with the largest amplitude in the plurality of sampling points is determined as a first sampling point.
For example, the signal profile of the acquired ultrasound signal is:
wherein A is the amplitude corresponding to the ultrasonic signal; Is a bandwidth factor; is the arrival time of the ultrasonic signal; Is the angular frequency; Is the phase angle, y is the ordinate of the coordinate system corresponding to the ultrasonic signal, t is the abscissa of the coordinate system corresponding to the ultrasonic signal, and the curve form is shown in fig. 7. The actual time interval within a period is short, the attenuation can be approximately considered to be smaller, and the ultrasonic curve which can be approximately considered to be attenuated at the moment is 。
The pulse width modulation curve corresponding to the ultrasonic surface density measuring device is determined by using the acquisition frequency corresponding to the receiving transducer, and the PWM curve in fig. 9 can be referred to specifically. And then acquiring the corresponding pulse width in the pulse width modulation curve and determining acquisition parameters based on the pulse width, wherein the acquisition parameters are used for acquiring four points correspondingly, and particularly as shown by solid points in fig. 9, the four sampling points respectively correspond to high-level pulses of the pulse width modulation curve, and the phase differences of the four sampling points are respectively 90 degrees. The sampling point having the largest amplitude among the plurality of sampling points is then determined as the first sampling point, and for convenience of description, the leftmost solid point in fig. 9 is determined as the first sampling point.
Optionally, the step S103 of determining a second sampling point adjacent to the first sampling point and calculating the offset angle of the ultrasonic signal according to the coordinate data of the first sampling point and the second sampling point, as shown in fig. 5, includes:
Step S501, determining the adjacent sampling point of the first sampling point as a second sampling point according to the propagation direction of the ultrasonic signal;
Step S502, respectively obtaining sampling point coordinate values corresponding to a first sampling point and a second sampling point by utilizing a coordinate system corresponding to a cosine curve;
Step S503, determining phase angles of sampling points corresponding to the first sampling point and the second sampling point based on the acquisition parameters;
Step S504, calculating the offset angle of the ultrasonic signal through the coordinate value of the sampling point and the phase angle of the sampling point.
The propagation direction of the ultrasonic signal can be determined according to the coordinate system in fig. 9, and the point adjacent to the first sampling point out of the four sampling points is determined as the second sampling point. And then, respectively acquiring coordinate values of sampling points corresponding to the first sampling point and the second sampling point by utilizing a coordinate system corresponding to the cosine curve, wherein if the ordinate of the first sampling point and the ordinate of the second sampling point are y 1 and y 2 respectively, then, determining phase angles of the sampling points corresponding to the first sampling point and the second sampling point based on the acquisition parameters.
The amplitude in the curve shown in FIG. 9 isThus, it is,And, depending on the nature of the trigonometric function,Therefore, it is。
From the following componentsIs available in the form of;
From the following componentsIs available in the form of;
Thus (2)。
Therefore, the offset angle of the ultrasonic signal is calculated by the sampling point coordinate value and the sampling point phase angle, and is calculated by the following formula:
;
Wherein, the Is the offset angle; And The ordinate coordinates of the first sampling point and the second sampling point in the coordinate system are corresponding respectively.
Optionally, the step S104 of generating an angle compensation strategy of the object to be measured through the offset angle and controlling the ultrasonic surface density measurement device to perform surface density measurement on the object to be measured based on the angle compensation strategy, as shown in fig. 6, includes:
Step S601, determining the amplitude position of a cosine curve based on a coordinate system corresponding to the cosine curve, and determining the phase difference between a first sampling point and the amplitude position;
Step S602, generating an angle compensation strategy of an object to be measured by using the offset angle and the phase difference, and generating measurement parameters corresponding to the ultrasonic surface density measurement equipment based on the angle compensation strategy, so that a first sampling point of the ultrasonic surface density measurement equipment coincides with an amplitude position under the current measurement parameters;
And step S603, controlling ultrasonic surface density measurement equipment to measure the surface density of the object to be measured by using the measurement parameters.
Obtaining the offset angleAnd then, compensating the acquired signal data according to the angle. For example, if a certain key data point acquired deviates from the ideal position due to offset, according to the calculationThe value adjusts the position of the data point on the waveform accordingly so that it is closer to the ideal position in the no-offset state, specifically, the open point in fig. 9, which is the compensated data point.
And carrying out surface density calculation by utilizing the signal data subjected to angle compensation, substituting the compensated data into a corresponding formula according to the basic principle and algorithm of ultrasonic surface density measurement, and obtaining a more accurate surface density value of the object to be measured.
The above process can refer to the flow chart of another ultrasonic surface density measurement method shown in FIG. 8, specifically, in a period, the time interval is very short, the attenuation can be approximately considered to be relatively small, and the curve is used as a functionTo represent. Corresponding to 4 sampling points, the first 2 sampling points are:, . Here, the 、Is based on the acquired correlation data values of the sampling points,Is the amplitude of the acquisition signal.The acquisition point offset angle caused by the object surface density change or movement needs to be solved.
From these two formulas, the property of trigonometric function and mathematical operation can be used to accurately deriveAngle value. Once obtainedThe acquired signal can be compensated for in a targeted manner depending on the angle. The compensation mode is not simple numerical adjustment, but from the essence of signal acquisition, the influence mechanism of angle offset on the signal is considered, and the signal data which is more similar to the real situation is restored by a mathematical method. Compared with the traditional method, the method is not limited to surface treatment of acquired data, but deep mining of the root cause of the offset and accurate correction are performed. For example, in different industrial application scenarios, the method can work as long as the problem of acquisition point deviation caused by movement of an object to be detected is faced in detection of the surface density of a metal plate or wall thickness measurement of a plastic pipe. By accurately calculating the offset angle and compensating, the measurement accuracy is effectively improved, and the measurement result is more close to the real surface density of the object. The improvement not only solves the difficult problem of precision which puzzles the ultrasonic surface density measurement technology for a long time, but also lays a foundation for the popularization of the technology in wider and more complex application scenes, and promotes the further development and application of the ultrasonic surface density measurement technology in industrial production.
From the ultrasonic surface density measurement method mentioned in the above embodiments, it is known that the method greatly improves the detection accuracy. The offset angle of the acquisition point caused by the change or movement of the surface density of the object to be measured is accurately calculated and compensated, so that the acquired signal data can reflect the actual situation more accurately. The method ensures that the measurement result can be highly close to the real surface density of the object in the ultrasonic surface density measurement process, and effectively avoids errors caused by offset of the acquisition points. The improvement of the precision is of great importance in the manufacturing industry with high precision requirements and in the detection field with strict quality control. The method is favorable for producing products with higher quality, reduces the defective rate, reduces the production cost and improves the economic benefit and market competitiveness of enterprises.
Secondly, the method enhances the adaptability of the ultrasonic surface density measurement technology. In practical application, the surface density change or movement condition of an object to be measured is complex and various, and the traditional signal acquisition method is difficult to deal with. The method can effectively solve the problem of acquisition point offset caused by object surface density change or movement, so that the ultrasonic surface density measurement technology can be stably applied to more different scenes, such as a high-speed production line, a dynamic detection environment and the like. The application range of the ultrasonic surface density measurement technology is widened, and conditions are created for popularization and application in more fields.
In addition, the method can improve detection efficiency. Because the method of the invention can compensate the offset of the acquisition point in real time, repeated check and correction of the measurement data are not needed like the traditional method, and the measurement time is greatly saved. In the occasion of large-scale production detection or high requirement on detection efficiency, the production efficiency can be obviously improved, the production period is reduced, and the utilization rate of equipment is improved.
The method of the invention carries out angle compensation based on a mathematical formula, has clear principle, relatively simple realization process, does not need to carry out large-scale hardware transformation on the existing ultrasonic surface density measuring equipment, and only needs to carry out optimization and upgrading on the software algorithm level. The cost of technology improvement is reduced, the popularization and the application are facilitated on the basis of the existing equipment, and the cost performance and the practicability are high.
Corresponding to the ultrasonic surface density measurement method provided in the foregoing embodiment, an embodiment of the present invention provides an ultrasonic surface density measurement system, where the system is applied to an ultrasonic surface density measurement device, as shown in fig. 10, and the system includes:
The initialization module 1010 is configured to control the ultrasonic surface density measurement device to emit pulsed ultrasonic waves to the object to be measured according to a preset emission frequency, and control a receiving transducer in the ultrasonic surface density measurement device to receive an ultrasonic signal after passing through the object to be measured in real time;
The sampling point determining module 1020 is configured to collect a plurality of sampling points in a single period of the ultrasonic signal based on the collection parameter corresponding to the receiving transducer, and determine a sampling point with the largest amplitude among the plurality of sampling points as a first sampling point;
The offset angle calculation module 1030 is configured to determine a second sampling point adjacent to the first sampling point, and calculate an offset angle of the ultrasonic signal according to coordinate data of the first sampling point and the second sampling point;
the measurement execution module 1040 is configured to generate an angle compensation policy of the object to be measured according to the offset angle, and control the ultrasonic surface density measurement device to perform surface density measurement on the object to be measured based on the angle compensation policy.
According to the ultrasonic surface density measurement system, the offset angle of the ultrasonic signal can be accurately calculated by utilizing the plurality of sampling points, so that the real-time signal compensation is performed on the offset of the sampling points caused by the movement of the object to be measured in the use process of the ultrasonic surface density measurement equipment, the measurement precision is remarkably improved, and the production efficiency is improved.
The ultrasonic surface density measurement system provided by the embodiment of the invention has the same implementation principle and technical effects as those of the ultrasonic surface density measurement method embodiment, and for the sake of brief description, reference may be made to the corresponding content in the ultrasonic surface density measurement method embodiment.
The embodiment also provides an ultrasonic surface density measurement device, and a schematic structural diagram of the ultrasonic surface density measurement device is shown in fig. 11, where the device includes a processor 101 and a memory 102, and the memory 102 is configured to store one or more computer instructions, where the one or more computer instructions are executed by the processor to implement steps of the ultrasonic surface density measurement method.
The ultrasonic surface density measuring device shown in fig. 11 further includes a bus 103 and a communication interface 104, and the processor 101, the communication interface 104, and the memory 102 are connected through the bus 103.
The memory 102 may include a high-speed random access memory (RAM, random Access Memory), and may further include a non-volatile memory (non-volatile memory), such as at least one disk memory. Bus 103 may be an ISA bus, a PCI bus, an EISA bus, or the like. The buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, only one bi-directional arrow is shown in FIG. 11, but not only one bus or type of bus.
The communication interface 104 is configured to connect with at least one user terminal and other network units through a network interface, and send the encapsulated IPv4 message or the IPv4 message to the user terminal through the network interface.
The processor 101 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 101 or instructions in the form of software. The Processor 101 may be a general-purpose Processor, including a central processing unit (Central Processing Unit, CPU), a network Processor (Network Processor, NP), a digital signal Processor (DIGITAL SIGNAL Processor, DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable gate array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, or discrete hardware components. The various methods, steps and logic blocks of the disclosure in the embodiments of the disclosure may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present disclosure may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 102, and the processor 101 reads information in the memory 102, and in combination with its hardware, performs the steps of the method of the previous embodiment.
The embodiment of the invention also provides a storage medium, and a computer program is stored on the storage medium, and the computer program is executed by a processor to execute the steps of the ultrasonic surface density measurement method in the previous embodiment.
In the several embodiments provided in the present application, it should be understood that the disclosed systems, apparatuses, devices, and methods may be implemented in other manners. The system embodiments described above are merely illustrative, e.g., the division of the elements is merely a logical functional division, and there may be additional divisions in actual implementation, and e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, indirect coupling or communication connection of devices or units, electrical, mechanical, or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. The storage medium includes a U disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, an optical disk, or other various media capable of storing program codes.
It should be noted that the foregoing embodiments are merely illustrative embodiments of the present invention, and not restrictive, and the scope of the invention is not limited to the embodiments, and although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that any modification, variation or substitution of some of the technical features of the embodiments described in the foregoing embodiments may be easily contemplated within the scope of the present invention, and the spirit and scope of the technical solutions of the embodiments do not depart from the spirit and scope of the embodiments of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method of ultrasonic areal density measurement, the method being applied to ultrasonic areal density measurement apparatus, the method comprising:
Controlling the ultrasonic surface density measurement equipment to emit pulse ultrasonic waves to an object to be measured according to preset emission frequency, and controlling a receiving transducer in the ultrasonic surface density measurement equipment to receive ultrasonic signals passing through the object to be measured in real time;
Collecting a plurality of sampling points in a single period of the ultrasonic signal based on the collection parameters corresponding to the receiving transducer, and determining the sampling point with the largest amplitude in the plurality of sampling points as a first sampling point;
Determining a second sampling point adjacent to the first sampling point, and calculating the offset angle of the ultrasonic signal according to the coordinate data of the first sampling point and the second sampling point;
Generating an angle compensation strategy of the object to be measured through the offset angle, and controlling the ultrasonic surface density measurement equipment to measure the surface density of the object to be measured based on the angle compensation strategy;
The collecting a plurality of sampling points in a single period of the ultrasonic signal based on the collecting parameters corresponding to the receiving transducer, and determining the sampling point with the largest amplitude in the plurality of sampling points as a first sampling point comprises the following steps:
determining a pulse width modulation curve corresponding to the ultrasonic surface density measurement equipment by utilizing the acquisition frequency corresponding to the receiving transducer;
acquiring a corresponding pulse width in the pulse width modulation curve, and determining the acquisition parameters based on the pulse width;
determining a cosine curve corresponding to a single period in the ultrasonic signal, acquiring a plurality of sampling points in the cosine curve by utilizing the acquisition parameters, and determining a sampling point with the largest amplitude in the plurality of sampling points as a first sampling point;
The generating an angle compensation strategy of the object to be measured through the offset angle, and controlling the ultrasonic surface density measurement device to measure the surface density of the object to be measured based on the angle compensation strategy, includes:
determining an amplitude position of the cosine curve based on a coordinate system corresponding to the cosine curve, and determining a phase difference between the first sampling point and the amplitude position;
Generating an angle compensation strategy of the object to be measured by utilizing the offset angle and the phase difference, and generating a measurement parameter corresponding to the ultrasonic surface density measurement equipment based on the angle compensation strategy, so that the first sampling point of the ultrasonic surface density measurement equipment coincides with the amplitude position under the current measurement parameter;
and controlling the ultrasonic surface density measurement equipment to measure the surface density of the object to be measured by using the measurement parameters.
2. The ultrasonic areal density measurement method according to claim 1, wherein controlling the ultrasonic areal density measurement apparatus to emit pulsed ultrasonic waves to an object to be measured according to a preset emission frequency comprises:
initializing an ultrasonic amplitude coefficient and a standard sample corresponding to the ultrasonic surface density measurement equipment;
acquiring calibration measurement data of the ultrasonic surface density measurement equipment on the standard sample, and determining an ultrasonic amplitude coefficient of the ultrasonic surface density measurement equipment by using the calibration measurement data;
And controlling the ultrasonic surface density measurement equipment to emit pulse ultrasonic waves to an object to be measured according to the preset emission frequency based on the ultrasonic amplitude coefficient, wherein the waveform of the ultrasonic signal of the object to be measured, which is received by the receiving transducer in real time, is spindle-shaped.
3. The ultrasonic areal density measurement method according to claim 1, wherein controlling the receiving transducer in the ultrasonic areal density measurement apparatus to receive in real time an ultrasonic signal after passing through the object to be measured comprises:
Acquiring the receiving transducer contained in the ultrasonic surface density measurement equipment, and determining the acquisition frequency of the receiving transducer;
and controlling an analog-digital converter in the receiving transducer through the acquisition frequency to receive the ultrasonic signal of the ultrasonic wave passing through the object to be detected in real time.
4. The ultrasonic areal density measurement method of claim 1, wherein the determining a second sampling point adjacent to the first sampling point and calculating the offset angle of the ultrasonic signal from the coordinate data of the first sampling point and the second sampling point comprises:
determining adjacent sampling points of the first sampling point in the plurality of sampling points as the second sampling point according to the propagation direction of the ultrasonic signal;
Respectively acquiring sampling point coordinate values corresponding to the first sampling point and the second sampling point by utilizing a coordinate system corresponding to the cosine curve;
Determining sampling point phase angles corresponding to the first sampling point and the second sampling point based on the acquisition parameters;
And calculating the offset angle of the ultrasonic signal through the coordinate value of the sampling point and the phase angle of the sampling point.
5. The ultrasonic areal density measurement method according to claim 4, wherein the calculating the offset angle of the ultrasonic signal by the sampling point coordinate value and the sampling point phase angle is calculated by the following equation:
Wherein, the Is the offset angle; And And the ordinate coordinates of the first sampling point and the second sampling point which correspond to each other in the coordinate system are respectively obtained.
6. The ultrasonic areal density measurement method of claim 2, wherein the signal profile corresponding to the ultrasonic signal is:
wherein A is the amplitude corresponding to the ultrasonic signal; Is a bandwidth factor; is the arrival time of the ultrasonic signal; Is the angular frequency; is a phase angle, y is the ordinate of the coordinate system corresponding to the ultrasonic signal, and t is the abscissa of the coordinate system corresponding to the ultrasonic signal.
7. An ultrasonic areal density measurement system, wherein the system is used in an ultrasonic areal density measurement apparatus, the system comprising:
the initialization module is used for controlling the ultrasonic surface density measurement equipment to emit pulse ultrasonic waves to an object to be measured according to preset emission frequency, and controlling a receiving transducer in the ultrasonic surface density measurement equipment to receive ultrasonic signals passing through the object to be measured in real time;
The sampling point determining module is used for acquiring a plurality of sampling points in a single period of the ultrasonic signal based on the acquisition parameters corresponding to the receiving transducer, and determining the sampling point with the largest amplitude in the plurality of sampling points as a first sampling point;
The offset angle calculation module is used for determining a second sampling point adjacent to the first sampling point and calculating the offset angle of the ultrasonic signal according to the coordinate data of the first sampling point and the second sampling point;
the measurement execution module is used for generating an angle compensation strategy of the object to be measured through the offset angle and controlling the ultrasonic surface density measurement equipment to perform surface density measurement on the object to be measured based on the angle compensation strategy;
The sampling point determining module is further used for determining a pulse width modulation curve corresponding to the ultrasonic surface density measuring device by utilizing the acquisition frequency corresponding to the receiving transducer, acquiring the corresponding pulse width in the pulse width modulation curve, determining the acquisition parameters based on the pulse width, determining a cosine curve corresponding to a single period in the ultrasonic signal, acquiring a plurality of sampling points in the cosine curve by utilizing the acquisition parameters, and determining the sampling point with the largest amplitude in the plurality of sampling points as a first sampling point;
The measurement execution module is further used for determining an amplitude position of the cosine curve based on a coordinate system corresponding to the cosine curve, determining a phase difference between the first sampling point and the amplitude position, generating an angle compensation strategy of the object to be measured by utilizing the offset angle and the phase difference, generating a measurement parameter corresponding to the ultrasonic surface density measurement device based on the angle compensation strategy, enabling the first sampling point of the ultrasonic surface density measurement device to coincide with the amplitude position under the current measurement parameter, and controlling the ultrasonic surface density measurement device to measure the surface density of the object to be measured by utilizing the measurement parameter.
8. An ultrasonic areal density measurement apparatus comprising a processor and a memory, the memory storing computer executable instructions executable by the processor to perform the steps of the ultrasonic areal density measurement method of any one of claims 1 to 6.
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| CN112082901B (en) * | 2019-06-13 | 2022-02-22 | 宁德时代新能源科技股份有限公司 | Surface density measurement compensation system |
| CN115839902A (en) * | 2022-09-02 | 2023-03-24 | 宁德时代新能源科技股份有限公司 | Surface density measurement method, surface density measurement system and computer equipment |
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| CN118392715A (en) * | 2024-06-28 | 2024-07-26 | 南京华视智能科技股份有限公司 | Lithium battery pole piece dry-method coating surface density detection method and detection system |
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