CN118857116B - A method, device, equipment and medium for displacement measurement based on photoelectric reflection - Google Patents
A method, device, equipment and medium for displacement measurement based on photoelectric reflection Download PDFInfo
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- 238000005259 measurement Methods 0.000 title claims abstract description 68
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
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Abstract
The invention relates to a displacement measurement method, a device, equipment and a medium based on photoelectric reflection, belonging to the field of displacement measurement. The method comprises the steps of obtaining a movable measuring medium, uniformly and alternately arranging bright stripes and dark stripes along the horizontal direction, arranging fixed reflective photoelectric switches on one side of the measuring medium in parallel along the horizontal direction, measuring displacement by moving the measuring medium along the horizontal direction, outputting a displacement sinusoidal signal, converting the displacement sinusoidal signal into a displacement digital signal through an analog-digital converter, transmitting the displacement digital signal to a micro-control unit, and identifying the displacement digital signal through the micro-control unit and obtaining the displacement of the measuring medium. The invention realizes the simple, high-efficiency and high-precision displacement measurement, and the device is simple and flexible and is convenient for practical application.
Description
Technical Field
The invention belongs to the technical field of displacement measurement, and particularly relates to a displacement measurement method, device, equipment and medium based on photoelectric reflection.
Background
At present, displacement measurement modes such as laser ranging and the like are commonly applied, but most of the displacement measurement modes have higher cost, strict requirements on measurement medium materials and are influenced by the manufacturing level of a process, various deviations can occur in the manufacturing process of the measurement medium, the displacement measurement precision is reduced, part of the measurement medium is complex in structure and difficult to manufacture, the manpower and material resources consumed in the displacement measurement process can be obviously increased, and meanwhile, the application scene of the measurement medium with complex structure is relatively less.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a displacement measurement method, a device, equipment and a medium based on photoelectric reflection.
The aim of the invention can be achieved by the following technical scheme:
A displacement measurement method based on photoelectric reflection, the implementation of the displacement measurement method comprising the steps of:
S1, acquiring a movable measuring medium, wherein the measuring medium comprises an opaque ruler tape, a metal plate and honeycomb paper, a fixed stripe width is preset, the long side of the measuring medium is taken as the horizontal direction, and light stripes and dark stripes are uniformly and alternately arranged on the measuring medium along the horizontal direction according to the fixed stripe width;
S2, arranging fixed reflective photoelectric switches on one side of the measurement medium in parallel along the horizontal direction, wherein the reflective photoelectric switches comprise a first reflective photoelectric switch and a second reflective photoelectric switch, displacement measurement is carried out by moving the measurement medium along the horizontal direction, light rays emitted by the reflective photoelectric switches sequentially reach the bright stripes and the dark stripes and output displacement sine signals to an analog-digital converter during displacement measurement, a central position is set, the central position is a connecting line midpoint of the first reflective photoelectric switch and the second reflective photoelectric switch, the horizontal movement direction of the measurement medium is regulated, the horizontal movement direction of the measurement medium comprises a positive direction and a negative direction, the direction from the connecting line midpoint to the first reflective photoelectric switch is the positive direction, and the direction from the connecting line midpoint to the second reflective photoelectric switch is the negative direction;
S3, converting the displacement sinusoidal signal into a displacement digital signal through the analog-digital converter and transmitting the displacement digital signal to the micro control unit;
S4, identifying the displacement digital signal through the micro control unit and acquiring the displacement of the measuring medium.
Preferably, the step S4 specifically includes:
S401, testing the measuring medium before leaving the factory and acquiring the complete periodic displacement of the measuring medium;
s402, acquiring the horizontal movement direction of the measurement medium based on the displacement digital signal;
S403, acquiring the displacement of the measuring medium according to a signal period identification algorithm based on the horizontal movement direction of the measuring medium, wherein the displacement of the measuring medium comprises positive displacement of the measuring medium and negative displacement of the measuring medium.
Preferably, the step S401 specifically includes:
S401-1, acquiring displacement digital signal information, wherein the displacement digital signal information comprises a maximum amplitude value of a displacement digital signal, a median amplitude value of the displacement digital signal and a minimum amplitude value of the displacement digital signal;
S401-2, acquiring a complete cycle of a displacement digital signal according to the information of the displacement digital signal, wherein the complete cycle of the displacement digital signal is a signal cycle corresponding to the time when the median amplitude value, the maximum amplitude value, the median amplitude value, the minimum amplitude value and the median amplitude value of the displacement digital signal are sequentially detected;
S401-3, obtaining the whole period displacement of the measuring medium corresponding to the whole period of the displacement digital signal.
Preferably, the step S402 specifically includes:
S402-1, acquiring a signal waveform phase of the displacement digital signal, wherein the signal waveform phase comprises a first signal waveform phase and a second signal waveform phase, the first signal waveform phase is output by the first reflective photoelectric switch, and the second signal waveform phase is output by the second reflective photoelectric switch;
s402-2, judging the signal waveform phase, wherein when the first signal waveform phase is smaller than the second signal waveform phase, the horizontal movement direction of the measuring medium is the positive direction;
When the phase of the first signal waveform is larger than that of the second signal waveform, the horizontal moving direction of the measuring medium is the negative direction.
Preferably, the step S403 specifically includes:
S403-1, when the horizontal movement direction of the measurement medium is the positive direction, acquiring positive direction displacement of the measurement medium according to the positive direction period number, wherein the positive direction period number comprises positive direction integer period number and positive direction decimal period number;
s403-2, when the horizontal movement direction of the measuring medium is the negative direction, acquiring negative direction displacement of the measuring medium according to the number of negative direction periods, wherein the number of negative direction periods comprises the integer number of negative direction periods and the decimal number of negative direction periods.
Preferably, the step S403-1 specifically includes:
Acquiring the positive integer period number, wherein the initial value of the positive integer period number is 0, detecting the displacement digital signal information in real time, and sequentially detecting the median value of the displacement digital signal, the minimum amplitude of the displacement digital signal, the median value of the displacement digital signal, the maximum amplitude of the displacement digital signal and the median value of the displacement digital signal to be a complete positive cycle of the displacement digital signal, wherein the positive integer period number is increased by 1 when one positive cycle of the displacement digital signal is detected;
When the fact that the previous positive cycle of the displacement digital signal is a complete cycle and the next positive cycle of the displacement digital signal is an incomplete cycle is detected, a positive direction termination amplitude of the displacement digital signal is obtained, a positive direction termination phase of the displacement digital signal is calculated according to the positive direction termination amplitude of the displacement digital signal, and a calculation formula is as follows:
,
Wherein, The positive direction termination phase of the displacement digital signal is represented by S sig 1, the positive direction termination amplitude of the displacement digital signal is represented by S max, the maximum amplitude of the displacement digital signal is represented by S min, and the minimum amplitude of the displacement digital signal is represented by S min;
calculating the number of decimal periods in the positive direction according to the positive direction termination phase of the displacement digital signal, wherein the calculation formula is as follows:
,
Wherein, l 1 is the number of positive direction decimal periods, Terminating the phase for the positive direction of the displacement digital signal;
Calculating the positive displacement of the measuring medium according to the positive direction period number, wherein the calculation formula is as follows:
,
Wherein L 1 is the positive displacement of the measuring medium, D is the complete period displacement of the measuring medium, N 1 is the integer period number in the positive direction, and L 1 is the fractional period number in the positive direction.
Preferably, the step S403-2 specifically includes:
acquiring the number of negative direction integer periods, wherein the initial value of the number of negative direction integer periods is 0, detecting the displacement digital signal information in real time, and sequentially detecting the median of the displacement digital signal, the maximum amplitude of the displacement digital signal, the median of the displacement digital signal, the minimum amplitude of the displacement digital signal and the median of the displacement digital signal to be a complete displacement digital signal negative cycle, wherein the number of negative direction integer periods is increased by 1 when one displacement digital signal negative cycle is detected;
When the fact that the previous displacement digital signal negative cycle is a complete cycle and the next displacement digital signal negative cycle is an incomplete cycle is detected, obtaining a displacement digital signal negative direction termination amplitude, and calculating a displacement digital signal negative direction termination phase according to the displacement digital signal negative direction termination amplitude, wherein the calculation formula is as follows:
,
Wherein, The phase is terminated in the negative direction of the displacement digital signal, S sig 2 is the termination amplitude in the negative direction of the displacement digital signal, S max is the maximum amplitude of the displacement digital signal, and S min is the minimum amplitude of the displacement digital signal;
Calculating the number of decimal periods in the negative direction according to the negative direction termination phase of the displacement digital signal, wherein the calculation formula is as follows:
,
Wherein, l 2 is the number of negative direction decimal periods, Terminating the phase for the negative direction of the displacement digital signal;
Calculating the negative direction displacement of the measuring medium according to the number of negative direction periods, wherein a calculation formula is as follows:
,
Wherein L 2 is the negative direction displacement of the measuring medium, D is the complete period displacement of the measuring medium, N 2 is the integer period number of the negative direction, and L 2 is the decimal period number of the negative direction.
The displacement measuring device based on photoelectric reflection is used for executing the displacement measuring method and is characterized by comprising a device setting module, a signal conversion module and a displacement measuring module;
The device setting module is used for obtaining a movable measuring medium, the measuring medium comprises an opaque ruler tape, a metal plate and honeycomb paper, fixed stripe widths are preset, the long sides of the measuring medium are taken as horizontal directions, bright stripes and dark stripes are uniformly and alternately arranged on the measuring medium along the horizontal directions according to the fixed stripe widths, fixed reflective photoelectric switches are arranged on one side of the measuring medium in parallel along the horizontal directions, the reflective photoelectric switches comprise a first reflective photoelectric switch and a second reflective photoelectric switch, displacement measurement is carried out by moving the measuring medium along the horizontal directions, light emitted by the reflective photoelectric switches sequentially reaches the bright stripes and the dark stripes and outputs displacement sine signals to an analog-digital converter during displacement measurement, a central position is set, the central position is a connecting line midpoint of the first reflective photoelectric switch and the second reflective photoelectric switch, the horizontal movement direction of the measuring medium is defined to comprise a positive direction and a negative direction, the connecting line midpoint is a positive direction and a negative direction of the first reflective photoelectric switch, and the connecting line midpoint is a negative direction of the second reflective photoelectric switch;
the signal conversion module is used for converting the displacement sinusoidal signal into a displacement digital signal through the analog-digital converter and transmitting the displacement digital signal to the micro control unit;
the displacement measurement module is used for identifying the displacement digital signal through the micro control unit and acquiring the displacement of the measurement medium.
An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the displacement measurement method described above when executing the program.
A storage medium containing computer executable instructions which, when executed by a computer processor, are for performing the displacement measurement method described above.
The beneficial effects of the invention are as follows:
(1) The displacement measurement is carried out through photoelectric reflection, so that the cost is remarkably reduced, the requirement on the material of the measurement medium is wide, the possibility of deviation in the manufacturing process of the measurement medium is reduced, the precision of the displacement measurement is improved, the measurement medium is simple in structure, and the application scene is relatively more.
(2) Measuring medium is tested before delivery, and the complete period displacement of the measuring medium is obtained, so that a foundation is provided for later displacement measurement, and the workload of later calculation is reduced;
(3) The horizontal moving direction of the measuring medium is obtained through the displacement digital signal, the limit that part of the measuring modes can only carry out unidirectional measurement is broken, and the measuring medium can move freely in positive and negative directions;
(4) The displacement of the measured medium is obtained according to the signal period identification algorithm based on the horizontal movement direction of the measured medium, the calculation is simple and convenient, the displacement measurement precision is high, and the displacement measurement work efficiency can be remarkably improved.
Drawings
The present invention is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
FIG. 1 is a flow chart showing the steps of a displacement measurement method based on photoelectric reflection according to the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the invention for achieving the preset aim, the following detailed description is given below of the specific implementation, structure, characteristics and effects according to the invention with reference to the attached drawings and the preferred embodiment.
The working principle and the using flow of the invention are as follows:
referring to fig. 1, a displacement measurement method based on photoelectric reflection includes:
S1, acquiring a movable measuring medium, wherein the measuring medium comprises, but is not limited to, an opaque tape, a metal plate and honeycomb paper, a fixed stripe width is preset, the long side of the measuring medium is taken as a horizontal direction, and light stripes and dark stripes are uniformly and alternately arranged on the measuring medium along the horizontal direction according to the fixed stripe width;
S2, arranging fixed reflective photoelectric switches on one side of the measurement medium in parallel along the horizontal direction, wherein the reflective photoelectric switches comprise a first reflective photoelectric switch and a second reflective photoelectric switch, displacement measurement is carried out by moving the measurement medium along the horizontal direction, light rays emitted by the reflective photoelectric switches sequentially reach the bright stripes and the dark stripes and output displacement sine signals to an analog-digital converter during displacement measurement, a central position is set, the central position is a connecting line midpoint of the first reflective photoelectric switch and the second reflective photoelectric switch, the horizontal movement direction of the measurement medium is regulated, the horizontal movement direction of the measurement medium comprises a positive direction and a negative direction, the direction from the connecting line midpoint to the first reflective photoelectric switch is the positive direction, and the direction from the connecting line midpoint to the second reflective photoelectric switch is the negative direction;
S3, converting the displacement sinusoidal signal into a displacement digital signal through the analog-digital converter and transmitting the displacement digital signal to the micro control unit;
S4, identifying the displacement digital signal through the micro control unit and acquiring the displacement of the measuring medium.
In this embodiment, the micro control unit recognizes the displacement digital signal and obtains the displacement of the measurement medium, which may be implemented by the following steps:
S401, testing the measuring medium before leaving the factory and obtaining the complete periodic displacement of the measuring medium, providing a basis for later displacement measurement, and reducing later calculation workload, wherein the complete periodic displacement of the measuring medium is the displacement of the measuring medium when a complete displacement digital signal period is detected;
S402, acquiring the horizontal movement direction of the measuring medium based on the displacement digital signal, and breaking the limit that part of the measuring modes can only be measured unidirectionally, so that the measuring medium can move freely in positive and negative directions;
S403, based on the horizontal movement direction of the measuring medium, the displacement of the measuring medium is obtained according to a signal period identification algorithm, the calculation is simple and convenient, the displacement measurement precision is high, the displacement measurement work efficiency can be remarkably improved, and the displacement of the measuring medium comprises the positive displacement of the measuring medium and the negative displacement of the measuring medium.
In this embodiment, the measuring medium is tested before shipment and the complete period displacement of the measuring medium is obtained, which can be implemented specifically by the following steps:
S401-1, acquiring displacement digital signal information, wherein the displacement digital signal information comprises a maximum amplitude value of a displacement digital signal, a median amplitude value of the displacement digital signal and a minimum amplitude value of the displacement digital signal;
S401-2, acquiring a complete cycle of a displacement digital signal according to the information of the displacement digital signal, wherein the complete cycle of the displacement digital signal is a signal cycle corresponding to the time when the median amplitude value, the maximum amplitude value, the median amplitude value, the minimum amplitude value and the median amplitude value of the displacement digital signal are sequentially detected;
S401-3, obtaining the whole period displacement of the measuring medium corresponding to the whole period of the displacement digital signal.
In this embodiment, the obtaining the horizontal movement direction of the measurement medium based on the displacement digital signal may be implemented specifically by:
S402-1, acquiring a signal waveform phase of the displacement digital signal, wherein the signal waveform phase comprises a first signal waveform phase and a second signal waveform phase, the first signal waveform phase is output by the first reflective photoelectric switch, and the second signal waveform phase is output by the second reflective photoelectric switch;
s402-2, judging the signal waveform phase, wherein when the first signal waveform phase is smaller than the second signal waveform phase, the horizontal movement direction of the measuring medium is the positive direction;
When the phase of the first signal waveform is larger than that of the second signal waveform, the horizontal moving direction of the measuring medium is the negative direction.
In this embodiment, the measured medium displacement is obtained according to a signal period recognition algorithm based on the horizontal movement direction of the measured medium, where the measured medium displacement includes a measured medium positive direction displacement and a measured medium negative direction displacement, and the method specifically may be implemented by the following steps:
S403-1, when the horizontal movement direction of the measurement medium is the positive direction, acquiring positive direction displacement of the measurement medium according to the positive direction period number, wherein the positive direction period number comprises positive direction integer period number and positive direction decimal period number;
Acquiring the positive integer period number, wherein the initial value of the positive integer period number is 0, detecting the displacement digital signal information in real time, and sequentially detecting the median value of the displacement digital signal, the minimum amplitude of the displacement digital signal, the median value of the displacement digital signal, the maximum amplitude of the displacement digital signal and the median value of the displacement digital signal to be a complete positive cycle of the displacement digital signal, wherein the positive integer period number is increased by 1 when one positive cycle of the displacement digital signal is detected;
When the fact that the previous positive cycle of the displacement digital signal is a complete cycle and the next positive cycle of the displacement digital signal is an incomplete cycle is detected, a positive direction termination amplitude of the displacement digital signal is obtained, a positive direction termination phase of the displacement digital signal is calculated according to the positive direction termination amplitude of the displacement digital signal, and a calculation formula is as follows:
,
Wherein, The positive direction termination phase of the displacement digital signal is represented by S sig 1, the positive direction termination amplitude of the displacement digital signal is represented by S max, the maximum amplitude of the displacement digital signal is represented by S min, and the minimum amplitude of the displacement digital signal is represented by S min;
calculating the number of decimal periods in the positive direction according to the positive direction termination phase of the displacement digital signal, wherein the calculation formula is as follows:
,
Wherein, l 1 is the number of positive direction decimal periods, Terminating the phase for the positive direction of the displacement digital signal;
Calculating the positive displacement of the measuring medium according to the positive direction period number, wherein the calculation formula is as follows:
,
Wherein L 1 is the positive displacement of the measuring medium, D is the complete periodic displacement of the measuring medium, N 1 is the integer number of positive cycles, and L 1 is the fractional number of positive cycles;
S403-2, when the horizontal movement direction of the measurement medium is the negative direction, acquiring negative direction displacement of the measurement medium according to the number of negative direction periods, wherein the number of negative direction periods comprises the integer number of negative direction periods and the decimal number of negative direction periods;
acquiring the number of negative direction integer periods, wherein the initial value of the number of negative direction integer periods is 0, detecting the displacement digital signal information in real time, and sequentially detecting the median of the displacement digital signal, the maximum amplitude of the displacement digital signal, the median of the displacement digital signal, the minimum amplitude of the displacement digital signal and the median of the displacement digital signal to be a complete displacement digital signal negative cycle, wherein the number of negative direction integer periods is increased by 1 when one displacement digital signal negative cycle is detected;
When the fact that the previous displacement digital signal negative cycle is a complete cycle and the next displacement digital signal negative cycle is an incomplete cycle is detected, obtaining a displacement digital signal negative direction termination amplitude, and calculating a displacement digital signal negative direction termination phase according to the displacement digital signal negative direction termination amplitude, wherein the calculation formula is as follows:
,
Wherein, The phase is terminated in the negative direction of the displacement digital signal, S sig 2 is the termination amplitude in the negative direction of the displacement digital signal, S max is the maximum amplitude of the displacement digital signal, and S min is the minimum amplitude of the displacement digital signal;
Calculating the number of decimal periods in the negative direction according to the negative direction termination phase of the displacement digital signal, wherein the calculation formula is as follows:
,
Wherein, l 2 is the number of negative direction decimal periods, Terminating the phase for the negative direction of the displacement digital signal;
Calculating the negative direction displacement of the measuring medium according to the number of negative direction periods, wherein a calculation formula is as follows:
,
Wherein L 2 is the negative direction displacement of the measuring medium, D is the complete period displacement of the measuring medium, N 2 is the integer period number of the negative direction, and L 2 is the decimal period number of the negative direction.
A displacement measuring device based on photoelectric reflection comprises a device setting module, a signal conversion module and a displacement measuring module;
The device setting module is used for obtaining a movable measuring medium, the measuring medium comprises but is not limited to an opaque ruler tape, a metal plate and honeycomb paper, fixed stripe widths are preset, the long sides of the measuring medium are used as horizontal directions, bright stripes and dark stripes are uniformly and alternately arranged on the measuring medium along the horizontal directions according to the fixed stripe widths, fixed reflective photoelectric switches are arranged on one side of the measuring medium along the horizontal directions in parallel, the reflective photoelectric switches comprise a first reflective photoelectric switch and a second reflective photoelectric switch, displacement measurement is carried out by moving the measuring medium along the horizontal directions, light emitted by the reflective photoelectric switches sequentially reaches the bright stripes and the dark stripes and outputs a displacement sine signal to an analog-digital converter during the displacement measurement, a central position is set, the horizontal movement direction of the measuring medium is defined as a connecting midpoint of the first reflective photoelectric switch and the second reflective photoelectric switch, the horizontal movement direction of the measuring medium comprises a positive direction and a negative direction, and the connecting midpoint of the measuring medium is the positive direction and the negative direction of the reflective photoelectric switch;
the signal conversion module is used for converting the displacement sinusoidal signal into a displacement digital signal through the analog-digital converter and transmitting the displacement digital signal to the micro control unit;
the displacement measurement module is used for identifying the displacement digital signal through the micro control unit and acquiring the displacement of the measurement medium.
The computer storage media of embodiments of the invention may take the form of any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing. Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
The present invention is not limited in any way by the above-described preferred embodiments, but is not limited to the above-described preferred embodiments, and any person skilled in the art will appreciate that the present invention can be embodied in the form of a program for carrying out the method of the present invention, while the above disclosure is directed to equivalent embodiments capable of being altered or modified in a slight manner, any and all concise modifications, equivalent variations and alterations of the above embodiments are still within the scope of the present disclosure, all as may be made without departing from the scope of the present disclosure.
Claims (6)
1. A displacement measurement method based on photoelectric reflection, characterized in that the implementation of the displacement measurement method comprises the following steps:
S1, acquiring a movable measuring medium, wherein the measuring medium comprises an opaque ruler tape, a metal plate and honeycomb paper, a fixed stripe width is preset, the long side of the measuring medium is taken as the horizontal direction, and light stripes and dark stripes are uniformly and alternately arranged on the measuring medium along the horizontal direction according to the fixed stripe width;
S2, arranging fixed reflective photoelectric switches on one side of the measurement medium in parallel along the horizontal direction, wherein the reflective photoelectric switches comprise a first reflective photoelectric switch and a second reflective photoelectric switch, displacement measurement is carried out by moving the measurement medium along the horizontal direction, light rays emitted by the reflective photoelectric switches sequentially reach the bright stripes and the dark stripes and output displacement sine signals to an analog-digital converter during displacement measurement, a central position is set, the central position is a connecting line midpoint of the first reflective photoelectric switch and the second reflective photoelectric switch, the horizontal movement direction of the measurement medium is regulated, the horizontal movement direction of the measurement medium comprises a positive direction and a negative direction, the direction from the connecting line midpoint to the first reflective photoelectric switch is the positive direction, and the direction from the connecting line midpoint to the second reflective photoelectric switch is the negative direction;
S3, converting the displacement sinusoidal signal into a displacement digital signal through the analog-digital converter and transmitting the displacement digital signal to the micro control unit;
s4, identifying the displacement digital signal through the micro control unit and acquiring the displacement of the measuring medium;
S401, testing the measuring medium before leaving the factory and acquiring the complete periodic displacement of the measuring medium;
s402, acquiring the horizontal movement direction of the measurement medium based on the displacement digital signal;
S403, acquiring the displacement of the measuring medium according to a signal period identification algorithm based on the horizontal movement direction of the measuring medium, wherein the displacement of the measuring medium comprises positive displacement of the measuring medium and negative displacement of the measuring medium;
S403-1, when the horizontal movement direction of the measurement medium is the positive direction, acquiring positive direction displacement of the measurement medium according to the positive direction period number, wherein the positive direction period number comprises positive direction integer period number and positive direction decimal period number;
Acquiring the positive integer period number, wherein the initial value of the positive integer period number is 0, detecting the displacement digital signal information in real time, and sequentially detecting the median value of the displacement digital signal, the minimum amplitude of the displacement digital signal, the median value of the displacement digital signal, the maximum amplitude of the displacement digital signal and the median value of the displacement digital signal to be a complete positive cycle of the displacement digital signal, wherein the positive integer period number is increased by 1 when one positive cycle of the displacement digital signal is detected;
When the fact that the previous positive cycle of the displacement digital signal is a complete cycle and the next positive cycle of the displacement digital signal is an incomplete cycle is detected, a positive direction termination amplitude of the displacement digital signal is obtained, a positive direction termination phase of the displacement digital signal is calculated according to the positive direction termination amplitude of the displacement digital signal, and a calculation formula is as follows:
,
Wherein, The positive direction termination phase of the displacement digital signal is represented by S sig 1, the positive direction termination amplitude of the displacement digital signal is represented by S max, the maximum amplitude of the displacement digital signal is represented by S min, and the minimum amplitude of the displacement digital signal is represented by S min;
calculating the number of decimal periods in the positive direction according to the positive direction termination phase of the displacement digital signal, wherein the calculation formula is as follows: ,
Wherein, l 1 is the number of positive direction decimal periods, Terminating the phase for the positive direction of the displacement digital signal;
Calculating the positive displacement of the measuring medium according to the positive direction period number, wherein the calculation formula is as follows:
,
Wherein L 1 is the positive displacement of the measuring medium, D is the complete periodic displacement of the measuring medium, N 1 is the integer number of positive cycles, and L 1 is the fractional number of positive cycles;
S403-2, when the horizontal movement direction of the measurement medium is the negative direction, acquiring negative direction displacement of the measurement medium according to the number of negative direction periods, wherein the number of negative direction periods comprises the integer number of negative direction periods and the decimal number of negative direction periods;
acquiring the number of negative direction integer periods, wherein the initial value of the number of negative direction integer periods is 0, detecting the displacement digital signal information in real time, and sequentially detecting the median of the displacement digital signal, the maximum amplitude of the displacement digital signal, the median of the displacement digital signal, the minimum amplitude of the displacement digital signal and the median of the displacement digital signal to be a complete displacement digital signal negative cycle, wherein the number of negative direction integer periods is increased by 1 when one displacement digital signal negative cycle is detected;
When the fact that the previous displacement digital signal negative cycle is a complete cycle and the next displacement digital signal negative cycle is an incomplete cycle is detected, obtaining a displacement digital signal negative direction termination amplitude, and calculating a displacement digital signal negative direction termination phase according to the displacement digital signal negative direction termination amplitude, wherein the calculation formula is as follows:
,
Wherein, The phase is terminated in the negative direction of the displacement digital signal, S sig 2 is the termination amplitude in the negative direction of the displacement digital signal, S max is the maximum amplitude of the displacement digital signal, and S min is the minimum amplitude of the displacement digital signal;
Calculating the number of decimal periods in the negative direction according to the negative direction termination phase of the displacement digital signal, wherein the calculation formula is as follows:
,
Wherein, l 2 is the number of negative direction decimal periods, Terminating the phase for the negative direction of the displacement digital signal;
Calculating the negative direction displacement of the measuring medium according to the number of negative direction periods, wherein a calculation formula is as follows:
,
Wherein L 2 is the negative direction displacement of the measuring medium, D is the complete period displacement of the measuring medium, N 2 is the integer period number of the negative direction, and L 2 is the decimal period number of the negative direction.
2. The displacement measurement method according to claim 1, wherein the step S401 specifically includes:
S401-1, acquiring displacement digital signal information, wherein the displacement digital signal information comprises a maximum amplitude value of a displacement digital signal, a median amplitude value of the displacement digital signal and a minimum amplitude value of the displacement digital signal;
S401-2, acquiring a complete cycle of a displacement digital signal according to the information of the displacement digital signal, wherein the complete cycle of the displacement digital signal is a signal cycle corresponding to the time when the median amplitude value, the maximum amplitude value, the median amplitude value, the minimum amplitude value and the median amplitude value of the displacement digital signal are sequentially detected;
S401-3, obtaining the whole period displacement of the measuring medium corresponding to the whole period of the displacement digital signal.
3. The displacement measurement method according to claim 1, wherein the step S402 specifically includes:
S402-1, acquiring a signal waveform phase of the displacement digital signal, wherein the signal waveform phase comprises a first signal waveform phase and a second signal waveform phase, the first signal waveform phase is output by the first reflective photoelectric switch, and the second signal waveform phase is output by the second reflective photoelectric switch;
s402-2, judging the signal waveform phase, wherein when the first signal waveform phase is smaller than the second signal waveform phase, the horizontal movement direction of the measuring medium is the positive direction;
When the phase of the first signal waveform is larger than that of the second signal waveform, the horizontal moving direction of the measuring medium is the negative direction.
4. A displacement measuring device based on photoelectric reflection applying the displacement measuring method as claimed in claim 1, which is characterized by comprising a device setting module, a signal conversion module and a displacement measuring module;
The device setting module is used for obtaining a movable measuring medium, the measuring medium comprises an opaque ruler tape, a metal plate and honeycomb paper, fixed stripe widths are preset, the long sides of the measuring medium are taken as horizontal directions, bright stripes and dark stripes are uniformly and alternately arranged on the measuring medium along the horizontal directions according to the fixed stripe widths, fixed reflective photoelectric switches are arranged on one side of the measuring medium in parallel along the horizontal directions, the reflective photoelectric switches comprise a first reflective photoelectric switch and a second reflective photoelectric switch, displacement measurement is carried out by moving the measuring medium along the horizontal directions, light emitted by the reflective photoelectric switches sequentially reaches the bright stripes and the dark stripes and outputs displacement sine signals to an analog-digital converter during displacement measurement, a central position is set, the central position is a connecting line midpoint of the first reflective photoelectric switch and the second reflective photoelectric switch, the horizontal movement direction of the measuring medium is defined to comprise a positive direction and a negative direction, the connecting line midpoint is a positive direction and a negative direction of the first reflective photoelectric switch, and the connecting line midpoint is a negative direction of the second reflective photoelectric switch;
the signal conversion module is used for converting the displacement sinusoidal signal into a displacement digital signal through the analog-digital converter and transmitting the displacement digital signal to the micro control unit;
the displacement measurement module is used for identifying the displacement digital signal through the micro control unit and acquiring the displacement of the measurement medium.
5. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the displacement measurement method according to any one of claims 1-3 when executing the program.
6. A storage medium containing computer executable instructions which, when executed by a computer processor, are for performing the displacement measurement method of any one of claims 1-3.
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