CN102914384B - Temperature detection method based on passive wireless surface acoustic wave temperature sensor - Google Patents
Temperature detection method based on passive wireless surface acoustic wave temperature sensor Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 18
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Abstract
The invention is suitable for the field of power passive wireless temperature detection and provides a temperature detection method based on a passive wireless surface acoustic wave temperature sensor. According to the embodiment of the invention, in an operating frequency range of the passive wireless surface acoustic wave temperature sensor, a detection device sequentially emits a plurality of radio frequency signals with the same power and different frequencies to the passive wireless surface acoustic wave temperature sensor in a form of frequency sweeping and receives radio frequency signals fed back from the sensor, a phase difference between a feedback signal and an emitting signal is detected after filtration and amplification, an emitting frequency fm corresponding to the maximum phase different break variable delta phi is found, and a temperature is calculated according to the emitting frequency fm. Meanwhile, a power of the feedback signal is detected, the saturation degree of the sensor is analyzed according to the power of the feedback signal, and the power of the radio frequency signals emitted in the next detection process is automatically regulated, so that the sensor works in the best state, and has a strong environment self-adaptation capacity.
Description
Technical field
The present invention relates to electric power passive and wireless thermometric field, particularly a kind of temperature checking method based on passive wireless acoustic surface wave temperature sensor.
Background technology
The power equipments such as high-tension switch cabinet contact in electric system high-tension apparatus, high-voltage busbar joint, isolating switch joint, underground cable, in During Process of Long-term Operation, there will be aging or contact resistance is excessive and generate heat, and the aging or contact resistance that report equipment is accelerated in heating further strengthens, cause heating aggravation, therefore enter a vicious cycle, finally easily cause the damage of equipment.Along with the development in city and the construction of intelligent grid, also more and more important to the temperature monitoring of high tension voltage equipment.
At present, existing thermometry probably can be summarized as: thermopair, infrared measurement of temperature, fiber grating, active radio, passive and wireless mode.
Thermopair mode is because it needs plain conductor signal transmission, and insulation is difficult.
Optical fiber grating temperature-measuring is because of easy to break, the easily broken feature of optical fiber, cause project installation just difficult, and easily cause decreasing insulating after accumulation dust.
During infrared measurement of temperature, focus on and have difficulties, take measurement of an angle and airborne dust has all caused impact to the accuracy of measuring, and infrared measurement of temperature also cannot realize on-line monitoring, infrared measurement of temperature is expensive simultaneously.
Active radio thermometric is installed battery because of needs on sensor, and secure context exists hidden danger, and battery has serviceable life, needs to change battery after being finished, and this has brought very large puzzlement to engineering maintenance.
What the current major part of passive and wireless thermometric adopted is passive wireless acoustic surface wave temperature sensor, it adopts communication, good insulating, and because sensor has no chance, there is not the potential safety hazard of active wireless mode and the problem of replacing battery, without later stage engineering maintenance.The resonance frequency of passive wireless acoustic surface wave temperature sensor is relatively good with the linearity of temperature drift simultaneously, the more convenient temperature detection of carrying out, the therefore on-line temperature monitoring of the very applicable high voltage electric power equip ment of passive and wireless thermometric.At present, in prior art, mostly adopt the operating frequency range of sensor is carried out to frequency sweep, find out the corresponding transmission frequency of sensor feedback signal power maximal value and be resonance frequency the method for accounting temperature again, but the method is overly dependent upon the size of sensor feedback signal power, when weak output signal that sensor feedback is returned, in testing process, be very easy to be subject to the phase mutual interference between space outerpace or sensor, cause temperature to occur abnormal.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of new temperature checking method based on passive wireless acoustic surface wave temperature sensor, solve and depend on that sensor feedback signal intensity, antijamming capability are weak, the problem of environment self-adaption ability in testing process unduly, promote wireless temperature measurement distance, improve reliability and the environment self-adaption ability of temperature detection.
For realizing above object, the invention provides a kind of temperature checking method based on passive wireless acoustic surface wave temperature sensor, it is characterized in that, said method comprising the steps of:
Steps A), in the operating frequency range of passive wireless acoustic surface wave temperature sensor, pick-up unit is launched multiple power is identical, frequency the is different radiofrequency signal radiofrequency signal to passive wireless acoustic surface wave temperature sensor receiving sensor feedback successively with the form of frequency sweep, after amplifying after filtering, detect feedback signal and transmit between phase differential
power with feedback signal
;
Step B), find out phase differential Sudden Changing Rate
corresponding transmission frequency when maximum
, be recorded as resonance frequency
, and according to computing formula
accounting temperature value, described in
actual temperature value during for calibration calibration,
for
time measured actual resonance frequency,
for sensor frequency is with the drift rate of temperature;
Step C), according to resonance frequency
corresponding feedback signal power
and before resonance frequency once, the corresponding feedback signal power of rear one-time detection Frequency point
with
, analyze the degree of saturation of sensor, and automatically regulate the power that in testing process next time, radio-frequency transmissions circuit transmits, make sensor appropriateness saturated, be operated in optimal situation, there is stronger environment self-adaption ability.
Further, in described steps A, the operating frequency range of establishing described passive wireless acoustic surface wave temperature sensor is L-H, pick-up unit with
for stepping successively transmission frequency is L, L+S, L+2S ... the radiofrequency signal of the radiofrequency signal of L+ (m-1) S, H detecting sensor feedback, described m is greater than 1 natural number; The lasting time of each transmitting is the default set time
, complete the rear pick-up unit of transmitting and be switched to immediately the radiofrequency signal that accepting state receiving sensor feeds back, the set time that interval is default
phase differential between rear detection signal and transmission frequency and the watt level of signal; Before each emitting radio frequency signal, postpone certain time delay
,
meet:
, described in
,
for the default set time, k is the random integers that are less than j, and described j is default positive integer.
Further, described step C also comprises: calculate
with
if,
and
time, transmit signal power reduces in testing process next time
dBm, if
or
time, transmit signal power increases in testing process next time
dBm, described in
,
,
for default constant, and
Contrast prior art, there is following technique effect in the present invention:
1, solved with sensor feedback signal intensity and judged the problem of depending on sensor feedback signal intensity size unduly existing in resonant frequency method, improved antijamming capability.
2, there is emissive power automatic regulation function, can automatically adapt to various complex environments, guarantee the optimum duty of sensor, promote the reliability of temperature detection.
Accompanying drawing explanation
Fig. 1 is the temperature detection flow process in the embodiment of the present invention;
The implementing procedure that Fig. 2 is the steps A that provides in the embodiment of the present invention;
Fig. 3 is the sensor feedback signal phase place of embodiment of the present invention detection method and the corresponding diagram of frequency;
Fig. 4 is the sensor feedback signal power of embodiment of the present invention detection method and the corresponding diagram of frequency;
Fig. 5 is the SPA sudden phase anomalies amount of embodiment of the present invention feedback signal and the corresponding diagram of frequency.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is done further and described in detail.Should be appreciated that embodiment described herein, only for explaining the present invention, is not limited to the present invention.
General thought of the present invention is: in the operating frequency range of passive wireless acoustic surface wave temperature sensor, pick-up unit is launched multiple power is identical, frequency the is different radiofrequency signal radiofrequency signal to passive wireless acoustic surface wave temperature sensor receiving sensor feedback successively with the form of frequency sweep, phase differential between detecting feedback signal and transmit after amplifying after filtering and the power of feedback signal, find out phase differential Sudden Changing Rate corresponding transmission frequency of when maximum
, be recorded as resonance frequency, and according to computing formula
accounting temperature value, described in
actual temperature value during for calibration calibration,
for
time measured actual resonance frequency,
for sensor frequency is with the drift rate of temperature, simultaneously according to resonance frequency
corresponding feedback signal power
and before resonance frequency once, the corresponding feedback signal power of rear one-time detection Frequency point
with
, analyze the degree of saturation of sensor, and automatically regulate the power that in testing process next time, radio-frequency transmissions circuit transmits, make sensor appropriateness saturated, be operated in optimal situation, there is stronger environment self-adaption ability.
Fig. 1 shows the flow process of the temperature checking method based on passive wireless acoustic surface wave temperature sensor that the embodiment of the present invention provides, and details are as follows:
In step S100, in the operating frequency range of passive wireless acoustic surface wave temperature sensor, pick-up unit is launched multiple power is identical, frequency the is different radiofrequency signal radiofrequency signal to passive wireless acoustic surface wave temperature sensor receiving sensor feedback successively with the form of frequency sweep, after amplifying after filtering, detect feedback signal and transmit between phase differential
power with feedback signal
.
In step S101, find out phase differential Sudden Changing Rate
corresponding transmission frequency when maximum
, be recorded as resonance frequency, and according to computing formula
accounting temperature value, described in
actual temperature value during for calibration calibration,
for
time measured actual resonance frequency,
for sensor frequency is with the drift rate of temperature.
Selected after the model of passive wireless acoustic surface wave temperature sensor, just can know
value.
can when calibration calibration, use other standards thermometer measure actual temperature.Like this, as long as measure in actual implementation process
time resonance frequency
just can obtain
.Complete after calibration calibration, just can will detect the resonance frequency obtaining at every turn
substitution formula
accounting temperature value.As long as therefore can correctly measure the resonance frequency of passive wireless temperature sensor
that's all.
In step S102, according to resonance frequency
corresponding feedback signal power
and before resonance frequency once, the corresponding feedback signal power of rear one-time detection Frequency point
with
, analyze the degree of saturation of sensor, and automatically regulate the power that in testing process next time, radio-frequency transmissions circuit transmits, make sensor appropriateness saturated, be operated in optimal situation.
Fig. 2 shows the implementing procedure of step S100, and details are as follows:
In step S1001, control testing circuit with identical power, with
for stepping successively transmission frequency is L, L+S, L+2S ... L+(n-1) radiofrequency signal of S, H, to sensor, postpones certain time delay before each transmitting
, and to launch the lasting time be the default time at every turn
.Described time delay
meet
, described in
,
for the default set time, k is the random integers that are less than j, and described j is default positive integer.
In step S1002, often complete the radiofrequency signal that is switched to immediately accepting state after transmitting and receives sensory feedback, interval time
rear detection feedback signal and the phase differential transmitting and the power of feedback signal.
In order to be illustrated more clearly in the present invention, as an example of an actual passive wireless temperature sensor example, describe below.
The operating frequency range of sensor is 429070000Hz-430370000Hz, and the frequency of this sensor is with the drift rate of temperature
for 7600Hz/ ℃, get m=130, take 10KHz as stepping, sensor is carried out to frequency sweep.
When system is just opened, need to first calibrate calibration.The actual temperature of first measuring measured point with standard thermometer, is designated as
.The radiofrequency signal that to control pick-up unit emissive power and be 8dBm, frequency be 429070000Hz is to sensor, but first postpones before transmitting
, emitting radio frequency signal subsequently, continue launch time
.After completing transmitting, be switched to immediately the radiofrequency signal that accepting state receiving sensor feeds back, interval time
poor and the signal power value of rear respectively detected phase, records.Then as the same manner detects 429080000Hz, 429090000Hz ... the phase differential of 430370000Hz and signal power value.Fig. 3 has shown the corresponding relation of phase place and the frequency of the each Frequency point after frequency sweep, and Fig. 4 shows the corresponding relation of signal power and the frequency of the each Frequency point after frequency sweep, and Fig. 5 shows SPA sudden phase anomalies amount
with the corresponding relation of frequency, therefrom find out phase differential Sudden Changing Rate
corresponding transmission frequency when maximum
, be designated as
.So just completed the calibration calibration operation of system.Only need by the resonance frequency of mode detecting sensor above afterwards
and substitution formula
can calculate the temperature when pre-test.Basis simultaneously
with
value analyze the degree of saturation of sensor in this testing process, and automatically regulate the power that in testing process next time, radiating circuit transmits.Such as
and
time, next time in testing process, pick-up unit emissive power is
.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included in protection scope of the present invention.
Claims (3)
1. the temperature checking method based on passive wireless acoustic surface wave temperature sensor, is characterized in that, said method comprising the steps of:
Steps A), in the operating frequency range of passive wireless acoustic surface wave temperature sensor, pick-up unit is launched multiple power is identical, frequency the is different radiofrequency signal radiofrequency signal to passive wireless acoustic surface wave temperature sensor receiving sensor feedback successively with the form of frequency sweep, after amplifying after filtering, detect feedback signal and transmit between phase differential
power P with feedback signal
n;
Step B), find out phase differential Sudden Changing Rate
corresponding transmission frequency f when maximum
n, be recorded as resonance frequency f
n, and according to computing formula
accounting temperature value, described T
0actual temperature value during for calibration calibration, f
0for T
0time measured actual resonance frequency, s
0for sensor frequency is with the drift rate of temperature;
Step C), according to resonance frequency f
ncorresponding feedback signal power P
nand before resonance frequency once, the corresponding feedback signal power P of rear one-time detection Frequency point
n-1and P
n+2, analyze the degree of saturation of sensor, and automatically regulate the power that in testing process next time, radio-frequency transmissions circuit transmits.
2. the temperature checking method based on passive wireless acoustic surface wave temperature sensor according to claim 1, is characterized in that, in described steps A, the operating frequency range of establishing described passive wireless acoustic surface wave temperature sensor is L-H, pick-up unit with
for stepping successively transmission frequency is L, L+S, L+2S ... the radiofrequency signal of the radiofrequency signal of L+ (m-1) S, H detecting sensor feedback, described m is greater than 1 natural number; The lasting time of each transmitting is default set time t
1, complete the rear pick-up unit of transmitting and be switched to immediately the radiofrequency signal that accepting state receiving sensor feeds back, the set time t that interval is default
2phase differential between rear detection signal and transmission frequency and the watt level of signal; Before each emitting radio frequency signal, postpone certain t time delay
delay, t
delaymeet: t
delay=t
3+ k × t
4, described t
3, t
4for the default set time, k is the random integers that are less than j, and described j is default positive integer.
3. the temperature checking method based on passive wireless acoustic surface wave temperature sensor according to claim 1, is characterized in that, described step C also comprises: calculate | P
n-P
n-1| and | P
n-P
n+1|, if | P
n-P
n-1| < c
1and | P
n-P
n+1| < c
1time, transmit signal power reduces c in testing process next time
0dBm, if | P
n-P
n-1| > c
2or | P
n-P
n+1| > c
2time, transmit signal power increases c in testing process next time
0dBm, described c
0, c
1, c
2for default constant, and c
2> c
1.
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| CN105987769B (en) * | 2015-01-29 | 2018-03-16 | 国家电网公司 | A kind of data measuring method and device based on surface acoustic wave sensor |
| CN105021305A (en) * | 2015-07-03 | 2015-11-04 | 江苏声立传感技术有限公司 | Automatic signal intensity control method based on IoT power temperature measuring equipment |
| CN105701521B (en) * | 2016-01-13 | 2018-11-16 | 中国科学院半导体研究所 | The monitoring device of radio frequency identification temperature label, system and method |
| CN106404210B (en) * | 2016-12-08 | 2023-10-20 | 广东中实源创科技有限公司 | Temperature measuring method and device and product using same |
| CN108344800B (en) * | 2018-01-17 | 2020-04-14 | 浙江大学 | Temperature detection system and transceiver system based on wireless passive surface acoustic wave sensor |
| CN111397760A (en) * | 2020-03-24 | 2020-07-10 | 华帝股份有限公司 | A non-contact temperature detection device for cooker and control method thereof |
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