CN102914384A - 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 PDF

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CN102914384A
CN102914384A CN2012103977156A CN201210397715A CN102914384A CN 102914384 A CN102914384 A CN 102914384A CN 2012103977156 A CN2012103977156 A CN 2012103977156A CN 201210397715 A CN201210397715 A CN 201210397715A CN 102914384 A CN102914384 A CN 102914384A
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sensor
frequency
power
passive wireless
temperature sensor
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CN102914384B (en
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邹俊华
余灯
彭光尼
胡鹏
余菲
鄢芬
崔新友
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WUHAN FIBERHOME ELECTRIC CO Ltd
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WUHAN FIBERHOME ELECTRIC CO Ltd
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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 corresponding to the maximum phase different break variable is found, and a temperature is calculated according to the emitting frequency. 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

A kind of temperature checking method based on the passive wireless acoustic surface wave temperature sensor
Technical field
The present invention relates to electric power passive and wireless thermometric field, particularly a kind of temperature checking method based on the passive wireless acoustic surface wave temperature sensor.
Background technology
The power equipments such as the high-tension switch cabinet contact in the electric system high-tension apparatus, high-voltage busbar joint, isolating switch joint, underground cable, in During Process of Long-term Operation, can occur aging or contact resistance is excessive and generate heat, and wearing out of newspaper equipment accelerated in heating or contact resistance further strengthens, cause the heating aggravation, therefore enter a vicious cycle, easily cause the damage of equipment at last.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.
The thermopair mode is because it needs the plain conductor signal transmission, and insulation is difficult.
Optical fiber grating temperature-measuring is because of easy to break, the easily broken characteristics of optical fiber, cause project installation just difficult, and easily cause decreasing insulating behind the accumulation dust.
Focus on during infrared measurement of temperature 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 can't realize on-line monitoring, infrared measurement of temperature is expensive simultaneously.
The active radio thermometric is installed battery because of needs at sensor, and there is hidden danger in secure context, and battery has serviceable life, needs to change battery after being finished, and this has brought very large puzzlement to engineering maintenance.
What the present major part of passive and wireless thermometric adopted is the passive wireless acoustic surface wave temperature sensor, it adopts communication, good insulating, and because sensor has no chance, there are not the potential safety hazard of active wireless mode and the problem of replacing battery, need not the later stage engineering maintenance.Simultaneously the resonance frequency of passive wireless acoustic surface wave temperature sensor is relatively good with the linearity of temperature drift, more conveniently carries out temperature detection, so the on-line temperature monitoring of the very suitable high voltage electric power equip ment of passive and wireless thermometric.At present, mostly adopt the operating frequency range to sensor to carry out frequency sweep in the prior art, find out the corresponding transmission frequency of sensor feedback signal power maximal value and be resonance frequency and 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 the sensor, cause temperature to occur unusual.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of new temperature checking method based on the passive wireless acoustic surface wave temperature sensor, solve and to depend in the testing process that sensor feedback signal intensity, antijamming capability are weak, the problem of environment self-adaption ability unduly, promote the wireless temperature measurement distance, improve reliability and the environment self-adaption ability of temperature detection.
For realizing above purpose, the invention provides a kind of temperature checking method based on the 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 a plurality of power are identical, frequency is different radiofrequency signal to the radiofrequency signal of passive wireless acoustic surface wave temperature sensor and receiving sensor feedback successively with the form of frequency sweep, through detect feedback signal behind the filter and amplification and transmit between phase differential
Figure 623993DEST_PATH_IMAGE001
Power with feedback signal
Figure 581585DEST_PATH_IMAGE002
Step B), find out the phase differential Sudden Changing Rate
Figure 787438DEST_PATH_IMAGE003
Corresponding transmission frequency when maximum
Figure 779665DEST_PATH_IMAGE004
, be recorded as resonance frequency
Figure 616034DEST_PATH_IMAGE004
, and according to computing formula The accounting temperature value, described
Figure 834580DEST_PATH_IMAGE006
Actual temperature value during for the calibration calibration,
Figure 415734DEST_PATH_IMAGE007
For
Figure 485322DEST_PATH_IMAGE006
The time measured actual resonance frequency,
Figure 417506DEST_PATH_IMAGE008
Be the drift rate of sensor frequency with temperature;
Step C), according to resonance frequency
Figure 230741DEST_PATH_IMAGE004
Corresponding feedback signal power
Figure 197560DEST_PATH_IMAGE002
And before the resonance frequency once, the corresponding feedback signal power of rear one-time detection Frequency point
Figure 906890DEST_PATH_IMAGE009
With
Figure 93414DEST_PATH_IMAGE010
, analyze the degree of saturation of sensor, and automatically regulate the power that the radio-frequency transmissions circuit transmits in the testing process next time, make the sensor appropriateness saturated, be operated in optimal situation, have stronger environment self-adaption ability.
Further, in the described steps A, the operating frequency range of establishing described passive wireless acoustic surface wave temperature sensor is L-H, pick-up unit with
Figure 179182DEST_PATH_IMAGE011
For stepping successively transmission frequency is L, L+S, L+2S ... the radiofrequency signal of the radiofrequency signal of L+ (m-1) S, H and detecting sensor feedback, described m is the natural number greater than 1; The time that each emission continues is the default set time
Figure 507DEST_PATH_IMAGE012
, finish the radiofrequency signal that the rear pick-up unit of emission switches to accepting state receiving sensor feedback immediately, the set time that the interval is default
Figure 146318DEST_PATH_IMAGE013
Phase differential between rear detection signal and the transmission frequency and the watt level of signal; Postpone certain time delay before each emitting radio frequency signal
Figure 53094DEST_PATH_IMAGE014
,
Figure 208132DEST_PATH_IMAGE014
Satisfy:
Figure 2012103977156100002DEST_PATH_IMAGE015
, described
Figure 585761DEST_PATH_IMAGE016
,
Figure 168052DEST_PATH_IMAGE017
Be the default set time, k is the random integers less than j, and described j is default positive integer.
Further, described step C also comprises: calculate With If,
Figure 785612DEST_PATH_IMAGE020
And
Figure 538805DEST_PATH_IMAGE021
The time, then next time in the testing process transmit signal power reduce DBm, if
Figure 887320DEST_PATH_IMAGE023
Or
Figure 537744DEST_PATH_IMAGE024
The time, then next time in the testing process transmit signal power increase
Figure 461838DEST_PATH_IMAGE022
DBm, described , ,
Figure 104806DEST_PATH_IMAGE026
Be default constant, and
Figure 199801DEST_PATH_IMAGE027
The 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 that exists in the resonant frequency method, improved antijamming capability.
2, have the emissive power automatic regulation function, can automatically adapt to various complex environments, guarantee the optimum duty of sensor, promote the reliability of temperature detection.
Description of drawings
Fig. 1 is the temperature detection flow process in the embodiment of the invention;
The implementing procedure of the steps A that provides in the embodiment of the invention is provided Fig. 2;
Fig. 3 is the sensor feedback signal phase place of embodiment of the invention detection method and the corresponding diagram of frequency;
Fig. 4 is the sensor feedback signal power of embodiment of the invention detection method and the corresponding diagram of frequency;
Fig. 5 is the SPA sudden phase anomalies amount of embodiment of the invention feedback signal and the corresponding diagram of frequency.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing the present invention is done further detailed description.Should be appreciated that embodiment described herein only is used for explaining the present invention, be 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 a plurality of power are identical, frequency is different radiofrequency signal to the radiofrequency signal of passive wireless acoustic surface wave temperature sensor and receiving sensor feedback successively with the form of frequency sweep, through the phase differential between detecting feedback signal and transmit behind the filter and amplification and the power of feedback signal, corresponding transmission frequency when finding out phase differential Sudden Changing Rate maximum
Figure 288717DEST_PATH_IMAGE004
, be recorded as resonance frequency, and according to computing formula
Figure 127360DEST_PATH_IMAGE028
The accounting temperature value, described Actual temperature value during for the calibration calibration,
Figure 752694DEST_PATH_IMAGE007
For
Figure 830371DEST_PATH_IMAGE006
The time measured actual resonance frequency,
Figure 207126DEST_PATH_IMAGE008
Be the drift rate of sensor frequency with temperature, simultaneously according to resonance frequency
Figure 686649DEST_PATH_IMAGE004
Corresponding feedback signal power
Figure 359332DEST_PATH_IMAGE002
And before the resonance frequency once, the corresponding feedback signal power of rear one-time detection Frequency point
Figure 924305DEST_PATH_IMAGE009
With
Figure 104751DEST_PATH_IMAGE010
, analyze the degree of saturation of sensor, and automatically regulate the power that the radio-frequency transmissions circuit transmits in the testing process next time, make the sensor appropriateness saturated, be operated in optimal situation, have stronger environment self-adaption ability.
The flow process based on the temperature checking method of passive wireless acoustic surface wave temperature sensor that Fig. 1 shows that the embodiment of the invention provides, 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 a plurality of power are identical, frequency is different radiofrequency signal to the radiofrequency signal of passive wireless acoustic surface wave temperature sensor and receiving sensor feedback successively with the form of frequency sweep, through detect feedback signal behind the filter and amplification and transmit between phase differential
Figure 704359DEST_PATH_IMAGE001
Power with feedback signal
In step S101, find out the phase differential Sudden Changing Rate
Figure 833170DEST_PATH_IMAGE029
Corresponding transmission frequency when maximum
Figure 817306DEST_PATH_IMAGE004
, be recorded as resonance frequency, and according to computing formula
Figure 271421DEST_PATH_IMAGE028
The accounting temperature value, described
Figure 548556DEST_PATH_IMAGE006
Actual temperature value during for the calibration calibration,
Figure 556964DEST_PATH_IMAGE007
For
Figure 79212DEST_PATH_IMAGE006
The time measured actual resonance frequency, Be the drift rate of sensor frequency with temperature.
After having selected the model of passive wireless acoustic surface wave temperature sensor, just can know
Figure 71756DEST_PATH_IMAGE008
Value.
Figure 98618DEST_PATH_IMAGE006
Can when the calibration calibration, use other standards thermometer measure actual temperature.Like this, as long as in actual implementation process, measure
Figure 158978DEST_PATH_IMAGE006
The time resonance frequency
Figure 811852DEST_PATH_IMAGE004
Just can obtain
Figure 932254DEST_PATH_IMAGE007
After finishing the calibration calibration, just can the resonance frequency that obtain will be detected at every turn
Figure 180833DEST_PATH_IMAGE004
The substitution formula
Figure 44884DEST_PATH_IMAGE005
The accounting temperature value.As long as therefore can correctly measure the resonance frequency of passive wireless temperature sensor
Figure 328098DEST_PATH_IMAGE004
That's all.
In step S102, according to resonance frequency
Figure 353823DEST_PATH_IMAGE004
Corresponding feedback signal power
Figure 89697DEST_PATH_IMAGE002
And before the resonance frequency once, the corresponding feedback signal power of rear one-time detection Frequency point With
Figure 128115DEST_PATH_IMAGE010
, analyze the degree of saturation of sensor, and automatically regulate the power that the radio-frequency transmissions circuit transmits in the testing process next time, make the 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 postpones certain time delay to sensor before each emission
Figure 547912DEST_PATH_IMAGE014
, and the lasting time of time for presetting of each emission
Figure 753766DEST_PATH_IMAGE012
Described time delay
Figure 480413DEST_PATH_IMAGE014
Satisfy
Figure 349406DEST_PATH_IMAGE031
, described
Figure 59873DEST_PATH_IMAGE016
,
Figure 803838DEST_PATH_IMAGE017
Be the default set time, k is the random integers less than j, and described j is default positive integer.
In step S1002, whenever finish switching to immediately the radiofrequency signal that accepting state receives sensory feedback, interval time after the emission
Figure 384992DEST_PATH_IMAGE013
Rear detection feedback signal and the phase differential that transmits and the power of feedback signal.
  
In order to be illustrated more clearly in the present invention, the below describes as an example of the passive wireless temperature sensor of a reality example.
The operating frequency range of sensor is 429070000Hz-430370000Hz, and the frequency of this sensor is with the drift rate of temperature
Figure 189000DEST_PATH_IMAGE008
For 7600Hz/ ℃, get m=130, take 10KHz as stepping sensor is carried out frequency sweep.
When system just opens, need to calibrate first calibration.Measure first the actual temperature of measured point with standard thermometer, be designated as
Figure 354140DEST_PATH_IMAGE006
Control pick-up unit emissive power be 8dBm, frequency be the radiofrequency signal of 429070000Hz to sensor, but before emission, postpone first
Figure 167375DEST_PATH_IMAGE014
, emitting radio frequency signal subsequently, continue launch time
Figure 603035DEST_PATH_IMAGE012
Switch to immediately the radiofrequency signal that the accepting state receiving sensor feeds back, interval time after finishing emission
Figure 577945DEST_PATH_IMAGE013
Poor and the signal power value of rear respectively detected phase is recorded.Then detect 429080000Hz, 429090000Hz such as the same manner ... the phase differential of 430370000Hz and signal power value.Fig. 3 shows the phase place of finishing each Frequency point after the frequency sweep and the corresponding relation of frequency, and Fig. 4 shows the corresponding relation of signal power and the frequency of each Frequency point after the frequency sweep, and Fig. 5 shows the SPA sudden phase anomalies amount
Figure 731845DEST_PATH_IMAGE032
With the corresponding relation of frequency, therefrom find out the phase differential Sudden Changing Rate
Figure 817613DEST_PATH_IMAGE029
Corresponding transmission frequency when maximum
Figure 874824DEST_PATH_IMAGE004
, be designated as
Figure 286214DEST_PATH_IMAGE007
So just finished the calibration calibration operation of system.Only need afterwards the resonance frequency by top mode detecting sensor
Figure 927411DEST_PATH_IMAGE004
And substitution formula
Figure 816869DEST_PATH_IMAGE028
Can calculate the temperature of current measurement.The while basis
Figure 227122DEST_PATH_IMAGE018
With
Figure 543834DEST_PATH_IMAGE019
Value analyze the degree of saturation of sensor in this testing process, and automatically regulate the power that radiating circuit transmits in the testing process next time.Such as
Figure 436441DEST_PATH_IMAGE020
And
Figure 864012DEST_PATH_IMAGE021
The time, then next time in the testing process, the pick-up unit emissive power is
Figure 394350DEST_PATH_IMAGE033
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included in protection scope of the present invention.

Claims (3)

1. the temperature checking method based on the 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 a plurality of power are identical, frequency is different radiofrequency signal to the radiofrequency signal of passive wireless acoustic surface wave temperature sensor and receiving sensor feedback successively with the form of frequency sweep, through detect feedback signal behind the filter and amplification and transmit between phase differential
Figure 2012103977156100001DEST_PATH_IMAGE002
Power with feedback signal
Step B), find out the phase differential Sudden Changing Rate
Figure 2012103977156100001DEST_PATH_IMAGE006
Corresponding transmission frequency when maximum
Figure 2012103977156100001DEST_PATH_IMAGE008
, be recorded as resonance frequency
Figure 330177DEST_PATH_IMAGE008
, and according to computing formula The accounting temperature value, described
Figure 2012103977156100001DEST_PATH_IMAGE012
Actual temperature value during for the calibration calibration, For
Figure 893270DEST_PATH_IMAGE012
The time measured actual resonance frequency,
Figure 2012103977156100001DEST_PATH_IMAGE016
Be the drift rate of sensor frequency with temperature;
Step C), according to resonance frequency
Figure 960583DEST_PATH_IMAGE008
Corresponding feedback signal power
Figure 945594DEST_PATH_IMAGE004
And before the resonance frequency once, the corresponding feedback signal power of rear one-time detection Frequency point
Figure 2012103977156100001DEST_PATH_IMAGE018
With
Figure 2012103977156100001DEST_PATH_IMAGE020
, analyze the degree of saturation of sensor, and automatically regulate the power that the radio-frequency transmissions circuit transmits in the testing process next time, make the sensor appropriateness saturated, be operated in optimal situation, have stronger environment self-adaption ability.
2. the temperature checking method based on the passive wireless acoustic surface wave temperature sensor according to claim 1 is characterized in that, in the described steps A, the operating frequency range of establishing described passive wireless acoustic surface wave temperature sensor is L-H, pick-up unit with
Figure 2012103977156100001DEST_PATH_IMAGE022
For stepping successively transmission frequency is L, L+S, L+2S ... the radiofrequency signal of the radiofrequency signal of L+ (m-1) S, H and detecting sensor feedback, described m is the natural number greater than 1; The time that each emission continues is the default set time
Figure 2012103977156100001DEST_PATH_IMAGE024
, finish the radiofrequency signal that the rear pick-up unit of emission switches to accepting state receiving sensor feedback immediately, the set time that the interval is default
Figure 2012103977156100001DEST_PATH_IMAGE026
Phase differential between rear detection signal and the transmission frequency and the watt level of signal; Postpone certain time delay before each emitting radio frequency signal
Figure DEST_PATH_IMAGE028
,
Figure 895620DEST_PATH_IMAGE028
Satisfy:
Figure DEST_PATH_IMAGE030
, described ,
Figure DEST_PATH_IMAGE034
Be the default set time, k is the random integers less than j, and described j is default positive integer.
3. the temperature checking method based on the passive wireless acoustic surface wave temperature sensor according to claim 1 is characterized in that, described step C also comprises: calculate
Figure DEST_PATH_IMAGE036
With
Figure DEST_PATH_IMAGE038
If,
Figure DEST_PATH_IMAGE040
And The time, then next time in the testing process transmit signal power reduce
Figure DEST_PATH_IMAGE044
DBm, if
Figure DEST_PATH_IMAGE046
Or
Figure DEST_PATH_IMAGE048
The time, then next time in the testing process transmit signal power increase
Figure 851069DEST_PATH_IMAGE044
DBm, described
Figure 784390DEST_PATH_IMAGE044
,
Figure DEST_PATH_IMAGE050
,
Figure DEST_PATH_IMAGE052
Be default constant, and
Figure DEST_PATH_IMAGE054
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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
CN105701521A (en) * 2016-01-13 2016-06-22 中国科学院半导体研究所 Monitoring device of wireless radio frequency identification temperature label, system and method thereof
CN105987769A (en) * 2015-01-29 2016-10-05 国家电网公司 Data measurement method and device based on surface acoustic wave sensor
CN106404210A (en) * 2016-12-08 2017-02-15 佛山市海科云筹信息技术有限公司 Temperature measuring method and device, and product using the same
CN108344800A (en) * 2018-01-17 2018-07-31 浙江大学 System for detecting temperature based on wireless passive sonic surface wave sensor and receive-transmit system

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CN105987769A (en) * 2015-01-29 2016-10-05 国家电网公司 Data measurement method and device based on surface acoustic wave sensor
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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
CN106404210A (en) * 2016-12-08 2017-02-15 佛山市海科云筹信息技术有限公司 Temperature measuring method and device, and product using the same
CN108344800A (en) * 2018-01-17 2018-07-31 浙江大学 System for detecting temperature based on wireless passive sonic surface wave sensor and receive-transmit system
CN108344800B (en) * 2018-01-17 2020-04-14 浙江大学 Temperature detection system and transceiving system based on wireless passive surface acoustic wave sensor

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