CN111076841B - Method and system for improving frequency sweeping efficiency of resonant acoustic surface wave temperature measurement system - Google Patents
Method and system for improving frequency sweeping efficiency of resonant acoustic surface wave temperature measurement system Download PDFInfo
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Abstract
The invention provides a method and a system for improving frequency sweeping efficiency of a resonant acoustic surface wave temperature measurement system, which comprises the following steps: optimizing the sweep frequency range: optimizing the sweep frequency range, and determining the sweep frequency range; frequency sweep step length optimization: and carrying out frequency sweeping within the frequency sweeping range by using a preset step length, and determining a final test temperature value. The invention can effectively improve the frequency sweeping efficiency of the system and the responsiveness of the system; through the optimization of the two aspects of the sweep frequency range and the sweep frequency step length, the sweep frequency efficiency of the system can be effectively improved, the responsiveness of system test is improved, the real-time requirement of wireless dynamic temperature monitoring of moving parts in various reciprocating or rotating mechanical structures is met, and the method has great popularization and application values.
Description
Technical Field
The invention relates to the technical field of wireless passive temperature measurement, in particular to a method and a system for improving frequency sweeping efficiency of a resonant acoustic surface wave temperature measurement system.
Background
The Surface Acoustic Wave (SAW) temperature measurement technology is a new temperature measurement technology in recent years, the SAW wave velocity changes with the change of external environmental factors, the SAW technology measures the temperature by using the characteristic that the SAW wave velocity is affected by the temperature, and fig. 2 is a schematic diagram of the SAW temperature measurement technology.
The SAW sensor mainly comprises a piezoelectric substrate, an interdigital transducer, reflecting gratings and an antenna, wherein the reflecting gratings comprise metal fingers which are periodically distributed, and two groups of reflecting gratings form an acoustic Fabry-Perot resonant cavity. After the transmitting/receiving transceiver transmits a pulse signal to the SAW sensor, the interdigital transducer receives the pulse and excites SAW harmonic waves in the resonant cavity; the transmitting/receiving transceiver is switched to a receiving state to receive the harmonic signals with the temperature information sent by the SAW sensor, and then the harmonic signals are analyzed to obtain corresponding temperature information.
For an ideal SAW sensor, the change in frequency is linear with the change in temperature, as shown in fig. 1 below.
When the frequency of a pulse signal sent by the transmitting/receiving transceiver is consistent with the inherent resonant frequency of the SAW sensor at the current temperature, resonance can occur to excite SAW harmonic waves and return a stronger harmonic signal carrying a temperature signal, so that in the actual working process, the transmitting/receiving transceiver needs to perform frequency sweeping operation in sequence within the working frequency band range of the SAW sensor with a certain step length until the frequency of the transmitting/receiving transceiver is consistent with the frequency of the SAW sensor, and after the strong harmonic signal is returned, the corresponding relationship between the frequency and the temperature is analyzed to obtain an actually measured temperature value.
The connecting rod bearing bush of the diesel engine is one of important parts of the engine, and is also one of parts with higher failure rate on the diesel engine at present, the reason that the bearing bush has failure is generally that when the lubrication condition of the engine is poor, lubricating oil is lacked between a crankshaft journal and the bearing bush or a lubricating oil film is damaged, dry friction is generated between a shaft and a bearing bush friction pair, the temperature of the dry friction pair is increased, alloy on the friction surface of the bearing bush is melted and sintered, and then the bearing bush is stuck on the journal or the bearing bush and the journal are occluded. Therefore, when the bearing bush breaks down, the temperature of the bearing bush always rises, so that the temperature of the bearing bush is the most direct parameter for reflecting whether the bearing bush normally runs, and monitoring the temperature of the bearing bush has extremely important significance for ensuring the normal and safe running of the diesel engine.
For medium and high speed diesel engines, the rotating speed can reach about 2000rpm at most, once a bearing bush is damaged, the fault of the diesel engine can develop to the degree of burning the bush and holding the shaft within tens of revolutions, in addition, in the working process of the diesel engine, due to the problem of installation space, the transmission of signals can not be guaranteed within one revolution of the diesel engine, and the angle for signal transmission is limited. Therefore, there is a higher demand for the response of the sensor than in other static applications, and for a monitoring system for a multi-cylinder complete machine connecting rod bearing, at least one temperature test is required for every two revolutions, i.e. one working cycle of 4 strokes. Therefore, how to obtain stable reflected harmonic signals in a limited time is a key element.
It can be seen from the whole process of surface acoustic wave temperature measurement that the rapid search of the natural resonant frequency of the SAW sensor at the current temperature is a main means for improving the test rate, and the current temperature measurement system based on the surface acoustic wave is mainly applied to a temperature monitoring system of a power switch cabinet, and has low response requirements on the system, so that the method mainly adopted in the aspect of obtaining the resonant frequency is to sweep frequency one by one in a frequency band range corresponding to the test temperature range by a fixed step length according to the corresponding relationship between the frequency and the temperature until the resonant frequency is reached, so as to obtain a stable reflected harmonic signal.
Aiming at a wireless passive temperature testing system applied to steady-state temperature monitoring, a frequency sweeping strategy tends to cause the lag of system response, and cannot meet the real-time requirement on dynamic temperature change monitoring in reciprocating or rotating mechanical structures such as connecting rod bearing bushes and the like.
Patent document CN104990625B (application number: 201510342196.7) discloses a wireless test circuit of a resonant type surface acoustic wave sensor, aiming at the problems of high cost, slow detection rate and high detection precision of the traditional wireless passive SAW sensor test circuit, the test circuit of the invention comprises an emitting unit, a receiving unit, a radio frequency switch and a signal processing unit, and is characterized in that the emitting unit comprises a signal generator and a power amplifier which are connected in sequence, the receiving unit comprises a low noise amplifier, a power detector and a low pass filter which are connected in sequence, and the signal processing unit comprises an a/D acquisition module and a digital signal processor which are connected in sequence; the transmitting unit and the receiving unit are respectively connected with the radio frequency switch, and the signal processing unit is connected with the receiving unit.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a system for improving the frequency sweeping efficiency of a resonant acoustic surface wave temperature measurement system.
The method for improving the frequency sweeping efficiency of the resonant acoustic surface wave temperature measurement system provided by the invention comprises the following steps:
optimizing the sweep frequency range: optimizing the sweep frequency range, and determining the sweep frequency range;
frequency sweep step length optimization: and carrying out frequency sweeping within the frequency sweeping range by using a preset step length, and determining a final test temperature value.
Preferably, the sweep range optimizing step includes:
when the wireless passive temperature monitoring system is powered on and started, performing first frequency sweeping operation in a frequency band range corresponding to a preset temperature range to obtain a first temperature value;
taking the first temperature value as the interval center of the next temperature test sweep frequency, and carrying out the second sweep frequency within the frequency band range corresponding to the preset interval width to obtain a second temperature value;
and taking the second temperature value as the interval center of the next temperature testing frequency sweep, and carrying out third frequency sweep in the frequency band range corresponding to the preset interval width to obtain a third temperature value.
Preferably, the sweep frequency range is determined according to the change of the first temperature value, the second temperature value and the third temperature value;
if the temperature values are sequentially increased, searching a positive half interval by the fourth frequency sweeping;
if the temperature values are sequentially reduced, searching a negative half interval for the fourth frequency sweeping;
and if the temperature value changes randomly, searching in the whole preset interval range by the fourth frequency sweeping.
Preferably, the sweep step size optimization step includes:
setting a threshold value of the intensity of the returned harmonic signal, and if the intensity of the returned harmonic signal is greater than the threshold value, acquiring a frequency band and an extreme value between the threshold values for the SAW sensor detected by the transceiver;
carrying out initial frequency sweeping with a set first step length until the frequency that the intensity of the echo signal is greater than a threshold value is detected;
performing frequency rising and frequency sweeping for the second time according to the set second step length;
if the intensity of the harmonic signal returned by the second frequency sweep is smaller than the threshold, the frequency with the intensity of the harmonic signal returned larger than the threshold is positioned on the right side of the extreme value, and the third frequency reduction frequency sweep is carried out according to the set third step length;
if the intensity of the harmonic signal returned by the second frequency sweep is greater than the threshold value, the frequency with the intensity of the harmonic signal returned greater than the threshold value is positioned on the left side of the extreme value, and the third frequency rising frequency sweep is carried out according to the set third step length;
after the third frequency sweep is finished, if the intensity of the returned harmonic signal is lower than that of the third frequency sweep, the fourth frequency sweep is carried out in a set fourth step length along the opposite direction, and if the intensity of the returned harmonic signal is higher than that of the third frequency sweep, the fourth frequency sweep is carried out in a set fourth step length along the current direction.
Preferably, when the deviation of the temperature values of three consecutive tests is within ± 2 ℃ and not modulated, the average value of the three tests is used as the temperature value of the final test.
The system for improving the frequency sweeping efficiency of the resonant acoustic surface wave temperature measurement system provided by the invention comprises:
the sweep frequency range optimization module: optimizing the sweep frequency range, and determining the sweep frequency range;
the sweep frequency step length optimization module: and carrying out frequency sweeping within the frequency sweeping range by using a preset step length, and determining a final test temperature value.
Preferably, the sweep range optimization module includes:
when the wireless passive temperature monitoring system is powered on and started, performing first frequency sweeping operation in a frequency band range corresponding to a preset temperature range to obtain a first temperature value;
taking the first temperature value as the interval center of the next temperature test sweep frequency, and carrying out the second sweep frequency within the frequency band range corresponding to the preset interval width to obtain a second temperature value;
and taking the second temperature value as the interval center of the next temperature testing frequency sweep, and carrying out third frequency sweep in the frequency band range corresponding to the preset interval width to obtain a third temperature value.
Preferably, the sweep frequency range is determined according to the change of the first temperature value, the second temperature value and the third temperature value;
if the temperature values are sequentially increased, searching a positive half interval by the fourth frequency sweeping;
if the temperature values are sequentially reduced, searching a negative half interval for the fourth frequency sweeping;
and if the temperature value changes randomly, searching in the whole preset interval range by the fourth frequency sweeping.
Preferably, the sweep step size optimization module includes:
setting a threshold value of the intensity of the returned harmonic signal, and if the intensity of the returned harmonic signal is greater than the threshold value, acquiring a frequency band and an extreme value between the threshold values for the SAW sensor detected by the transceiver;
carrying out initial frequency sweeping with a set first step length until the frequency that the intensity of the echo signal is greater than a threshold value is detected;
performing frequency rising and frequency sweeping for the second time according to the set second step length;
if the intensity of the harmonic signal returned by the second frequency sweep is smaller than the threshold, the frequency with the intensity of the harmonic signal returned larger than the threshold is positioned on the right side of the extreme value, and the third frequency reduction frequency sweep is carried out according to the set third step length;
if the intensity of the harmonic signal returned by the second frequency sweep is greater than the threshold value, the frequency with the intensity of the harmonic signal returned greater than the threshold value is positioned on the left side of the extreme value, and the third frequency rising frequency sweep is carried out according to the set third step length;
after the third frequency sweep is finished, if the intensity of the returned harmonic signal is lower than that of the third frequency sweep, the fourth frequency sweep is carried out in a set fourth step length along the opposite direction, and if the intensity of the returned harmonic signal is higher than that of the third frequency sweep, the fourth frequency sweep is carried out in a set fourth step length along the current direction.
Preferably, when the deviation of the temperature values of three consecutive tests is within ± 2 ℃ and not modulated, the average value of the three tests is used as the temperature value of the final test.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can effectively improve the frequency sweeping efficiency of the system and the responsiveness of the system;
2. the invention can effectively improve the frequency sweeping efficiency of the system and the responsiveness of system test by optimizing the frequency sweeping range and the frequency sweeping step length so as to meet the real-time requirement of wireless dynamic temperature monitoring of moving parts in various reciprocating or rotating mechanical structures, and has greater popularization and application values.
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Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a graph of temperature versus signal frequency;
FIG. 2 is a schematic diagram of the principle of operation of a sound surface;
FIG. 3 is a diagram illustrating the relationship between frequency and signal strength;
fig. 4 is a flowchart of the sweep step size optimization strategy.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The technical scheme optimizes strategies from the two aspects of the frequency sweep range and the frequency sweep step length of the transmitting/receiving transceiver so as to effectively improve the frequency sweep efficiency and improve the responsiveness of temperature monitoring.
1. Sweep frequency range optimization
From the aspect of frequency sweep range, for the SAW sensor, the temperature measurement range is generally between-20 ℃ and 150 ℃, but for specific applications, the common temperature range is usually smaller than the temperature measurement range of the sensor, for example, the actual temperature range of the connecting rod bearing bush is between 60 ℃ and 120 ℃ (including the initial stage of fault occurrence and the stage before effective early warning), so the actual frequency sweep range can be limited in the frequency band range corresponding to the temperature range in a specific application scene, so as to narrow the frequency band range of frequency sweep, and further shorten the frequency sweep time.
When the wireless passive temperature monitoring system is just powered on and started, because the initial temperature is not used as a reference, frequency sweeping operation is carried out in a frequency band range corresponding to a set temperature range;
when the system has normally measured the first temperature value, the current temperature value can be used as the interval center of the next temperature test sweep frequency for the second temperature point, and the sweep frequency is carried out in the frequency band range corresponding to a certain interval width so as to further reduce the sweep frequency range;
the precision of the current monitoring system is about +/-2 ℃, and certain temperature fluctuation inevitably exists when the normal working condition is stable, so that the third temperature point still adopts a sweep frequency range determination strategy of the second temperature point;
the sweep frequency range is developed from the fourth temperature measuring point, the sweep frequency range can be further optimized according to the temperature change of the previous 3 points, and if the temperature is sequentially increased, the positive half interval is preferentially searched; if the temperature is reduced in sequence, searching the negative half interval preferentially; if the random variation exists, searching in the whole interval range;
2. single temperature test sweep frequency step length optimization
After the sweep frequency range is locked by the method, the sweep frequency efficiency can be further improved by optimizing the sweep frequency step length. As shown in fig. 3, which is a graph of the relationship between the harmonic frequency returned by the SAW sensor and the signal strength, the frequency corresponding to the extreme value of the waveform in the graph is the natural resonant frequency of the SAW sensor at the current temperature, for the SAW sensor, a threshold value of the returned harmonic signal strength can be preset, if the value X shown in the graph is greater than the threshold value, the transceiver is considered to detect the SAW sensor, and the frequency band Δ F between the two values X on the waveform shown in the graph can also be obtained through testing.
After the X value and the corresponding delta F are obtained, the optimization work of the sweep step length can be carried out in a certain sweep range. Setting the initial sweep step size as delta F, and sequentially carrying out sweep operation by the step size of the delta F until the frequency F1 that the intensity of the echo signal is greater than the X value is detected; then continuing the next frequency raising and sweeping by delta F/2 step length; if the returned signal intensity is greater than the value X, the F1 is indicated to be positioned at the left side of the extreme value, and the next frequency increasing frequency sweeping is carried out by the delta F/4 step length; after detecting the delta F/4 step length, if the signal intensity is lower than the last sweep frequency, carrying out next sweep frequency by the delta F/8 step length along the opposite direction, if the signal intensity is higher than the last sweep frequency, continuing carrying out next sweep frequency by the delta F/8 step length along the current direction, and so on until the temperature value deviation of the three continuous tests is +/-2 ℃ and the temperature value deviation is not singly modulated, considering the average value of the three tests as the temperature value of the final test. The specific flow is shown in fig. 4.
Aiming at the frequency band range corresponding to the original test temperature range, the frequency sweep strategy is one by one in a fixed step length, and the technical scheme can effectively improve the frequency sweep efficiency of the system and the responsiveness of the system test by optimizing the frequency sweep range and the frequency sweep step length from the viewpoint of improving the responsiveness of the system so as to meet the real-time requirement of wireless dynamic temperature monitoring of moving parts in various reciprocating or rotating mechanical structures.
The optimization strategy is applied to a connecting rod bearing bush temperature monitoring device under research, the single temperature test time is within 50ms after the test at present, the test at the rotating speed of 2000RPM is taken as an example, the time of one working cycle of a diesel engine is 60ms, and the real-time requirement of completing the temperature test once in one working cycle can be met.
In the aspect of optimizing the frequency sweep range, the frequency sweep range can be limited to a frequency band range corresponding to 60-120 ℃ according to the actual temperature range of the connecting rod bearing bush (including the initial stage of fault occurrence and the stage before effective early warning).
When the connecting rod bearing bush temperature monitoring system is just powered on and started, performing frequency sweeping operation within a set frequency band range corresponding to 60-120 ℃; because the normal working condition change of the diesel engine and the temperature change rate in a working cycle when a fault occurs generally do not exceed +/-5 ℃, the sweep frequency operation is carried out in a frequency band range corresponding to the interval width of +/-5 ℃ by taking the current temperature value as the interval center of the next temperature testing sweep frequency at the second temperature point; the third temperature point is the same as above.
Starting from the fourth temperature measuring point, if the temperature of the previous 3 points is sequentially increased, searching a +5 ℃ half interval preferentially; if the temperature is reduced in sequence, searching a-5 ℃ half interval preferentially; if the random variation is detected, searching within the interval range of +/-5 ℃;
in the aspect of single test sweep frequency step length optimization, according to actual test, an X value is set to be 15dB, a frequency band range corresponding to 15dB of an echo signal is used as an initial step length, and the resonant frequency is searched by gradually halving according to an optimization strategy.
The intelligent achievement optimizes the system frequency sweep strategy from the two aspects of the frequency band range and the step length of the frequency sweep of the transceiver aiming at the resonant surface acoustic wave temperature measurement system. In the aspect of frequency sweep range, the subsequent frequency sweep is carried out within the range of the actual possible temperature change amplitude by taking the current temperature as the reference in combination with the temperature range and the temperature change condition in practical application; in the aspect of frequency sweep step length, a frequency band range corresponding to a certain echo signal intensity threshold value is used as an initial step length, a search method of reducing half gradually from far to near and from sparse to dense successive approximation is adopted to search for resonance frequency, the frequency sweep efficiency of the system can be effectively improved through the method, and the responsiveness of the system is improved.
Those skilled in the art will appreciate that, in addition to implementing the systems, apparatus, and various modules thereof provided by the present invention in purely computer readable program code, the same procedures can be implemented entirely by logically programming method steps such that the systems, apparatus, and various modules thereof are provided in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system, the device and the modules thereof provided by the present invention can be considered as a hardware component, and the modules included in the system, the device and the modules thereof for implementing various programs can also be considered as structures in the hardware component; modules for performing various functions may also be considered to be both software programs for performing the methods and structures within hardware components.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (6)
1. A method for improving frequency sweeping efficiency of a resonant acoustic surface wave temperature measurement system is characterized by comprising the following steps:
optimizing the sweep frequency range: optimizing the sweep frequency range, and determining the sweep frequency range;
frequency sweep step length optimization: performing frequency sweeping within a frequency sweeping range by using a preset step length, and determining a final test temperature value;
the sweep range optimization step comprises:
when the wireless passive temperature monitoring system is powered on and started, performing first frequency sweeping operation in a frequency band range corresponding to a preset temperature range to obtain a first temperature value;
taking the first temperature value as the interval center of the next temperature test sweep frequency, and carrying out the second sweep frequency within the frequency band range corresponding to the preset interval width to obtain a second temperature value;
taking the second temperature value as the interval center of the next temperature test sweep frequency, and carrying out third sweep frequency within the frequency band range corresponding to the preset interval width to obtain a third temperature value;
determining a sweep frequency range according to the change of the first temperature value, the second temperature value and the third temperature value;
if the temperature values are sequentially increased, searching a positive half interval by the fourth frequency sweeping;
if the temperature values are sequentially reduced, searching a negative half interval for the fourth frequency sweeping;
and if the temperature value changes randomly, searching in the whole preset interval range by the fourth frequency sweeping.
2. The method for improving frequency sweeping efficiency of the resonant surface acoustic wave temperature measurement system according to claim 1, wherein the frequency sweeping step length optimizing step comprises:
setting a threshold value of the intensity of the returned harmonic signal, and if the intensity of the returned harmonic signal is greater than the threshold value, acquiring a frequency band and an extreme value between the threshold values for the SAW sensor detected by the transceiver;
carrying out initial frequency sweeping with a set first step length until the frequency that the intensity of the echo signal is greater than a threshold value is detected;
performing frequency rising and frequency sweeping for the second time according to the set second step length;
if the intensity of the harmonic signal returned by the second frequency sweep is smaller than the threshold, the frequency with the intensity of the harmonic signal returned larger than the threshold is positioned on the right side of the extreme value, and the third frequency reduction frequency sweep is carried out according to the set third step length;
if the intensity of the harmonic signal returned by the second frequency sweep is greater than the threshold value, the frequency with the intensity of the harmonic signal returned greater than the threshold value is positioned on the left side of the extreme value, and the third frequency rising frequency sweep is carried out according to the set third step length;
after the third frequency sweep is finished, if the intensity of the returned harmonic signal is lower than that of the third frequency sweep, the fourth frequency sweep is carried out in a set fourth step length along the opposite direction, and if the intensity of the returned harmonic signal is higher than that of the third frequency sweep, the fourth frequency sweep is carried out in a set fourth step length along the current direction.
3. The method of claim 1, wherein when the temperature deviations of three consecutive tests are within ± 2 ℃ and not modulated, the average of the three tests is used as the temperature of the final test.
4. The utility model provides a system for improve resonant mode surface acoustic wave temperature measurement system frequency sweep efficiency which characterized in that includes:
the sweep frequency range optimization module: optimizing the sweep frequency range, and determining the sweep frequency range;
the sweep frequency step length optimization module: performing frequency sweeping within a frequency sweeping range by using a preset step length, and determining a final test temperature value;
the sweep range optimization module comprises:
when the wireless passive temperature monitoring system is powered on and started, performing first frequency sweeping operation in a frequency band range corresponding to a preset temperature range to obtain a first temperature value;
taking the first temperature value as the interval center of the next temperature test sweep frequency, and carrying out the second sweep frequency within the frequency band range corresponding to the preset interval width to obtain a second temperature value;
taking the second temperature value as the interval center of the next temperature test sweep frequency, and carrying out third sweep frequency within the frequency band range corresponding to the preset interval width to obtain a third temperature value;
determining a sweep frequency range according to the change of the first temperature value, the second temperature value and the third temperature value;
if the temperature values are sequentially increased, searching a positive half interval by the fourth frequency sweeping;
if the temperature values are sequentially reduced, searching a negative half interval for the fourth frequency sweeping;
and if the temperature value changes randomly, searching in the whole preset interval range by the fourth frequency sweeping.
5. The system for improving frequency sweeping efficiency of the resonant acoustic surface wave temperature measurement system according to claim 4, wherein the frequency sweeping step length optimizing module comprises:
setting a threshold value of the intensity of the returned harmonic signal, and if the intensity of the returned harmonic signal is greater than the threshold value, acquiring a frequency band and an extreme value between the threshold values for the SAW sensor detected by the transceiver;
carrying out initial frequency sweeping with a set first step length until the frequency that the intensity of the echo signal is greater than a threshold value is detected;
performing frequency rising and frequency sweeping for the second time according to the set second step length;
if the intensity of the harmonic signal returned by the second frequency sweep is smaller than the threshold, the frequency with the intensity of the harmonic signal returned larger than the threshold is positioned on the right side of the extreme value, and the third frequency reduction frequency sweep is carried out according to the set third step length;
if the intensity of the harmonic signal returned by the second frequency sweep is greater than the threshold value, the frequency with the intensity of the harmonic signal returned greater than the threshold value is positioned on the left side of the extreme value, and the third frequency rising frequency sweep is carried out according to the set third step length;
after the third frequency sweep is finished, if the intensity of the returned harmonic signal is lower than that of the third frequency sweep, the fourth frequency sweep is carried out in a set fourth step length along the opposite direction, and if the intensity of the returned harmonic signal is higher than that of the third frequency sweep, the fourth frequency sweep is carried out in a set fourth step length along the current direction.
6. The system for improving frequency sweeping efficiency of the resonant surface acoustic wave temperature measuring system according to claim 4, wherein when the temperature value deviation of three consecutive tests is within ± 2 ℃ and not modulated, the average value of the three tests is taken as the temperature value of the final test.
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| US7405675B2 (en) * | 2006-01-19 | 2008-07-29 | Michelin Recherche Et Technique S. A. | System and method for reducing search time and increasing search accuracy during interrogation of resonant devices |
| JP5133108B2 (en) * | 2007-05-09 | 2013-01-30 | 株式会社神戸製鋼所 | Temperature measuring device and temperature measuring method |
| CN102103021A (en) * | 2010-12-31 | 2011-06-22 | 深圳市虹远通信有限责任公司 | Temperature detection method and device based on passive wireless temperature sensor |
| CN103310172A (en) * | 2013-05-13 | 2013-09-18 | 天津通广集团谷津高科技有限公司 | Echo frequency discrimination method for passive radio frequency identification temperature measurement system |
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