CN108344800B - Temperature detection system and transceiving system based on wireless passive surface acoustic wave sensor - Google Patents
Temperature detection system and transceiving system based on wireless passive surface acoustic wave sensor Download PDFInfo
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- CN108344800B CN108344800B CN201810046436.2A CN201810046436A CN108344800B CN 108344800 B CN108344800 B CN 108344800B CN 201810046436 A CN201810046436 A CN 201810046436A CN 108344800 B CN108344800 B CN 108344800B
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/036—Analysing fluids by measuring frequency or resonance of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/014—Resonance or resonant frequency
Abstract
The invention discloses a temperature detection system and a transceiving system based on a wireless passive surface acoustic wave sensor, and belongs to the technical field of temperature detection. The temperature detection system comprises a radio frequency transceiving system and a surface acoustic wave sensor, wherein the radio frequency transceiving system comprises a control unit, a man-machine interaction unit, a transceiving antenna, a transmitting link, a receiving link and a selection switch unit: the receiving and transmitting antenna is a multi-frequency antenna; the transmitting link comprises a radio frequency signal generating module, a switch module, a replaceable frequency adapting module and a power amplifying module which are electrically connected; the receiving link comprises a replaceable filtering module, a signal amplification module and a power detection module which are electrically connected; and the selection switch unit is used for selectively connecting one of the transmitting chain and the receiving chain with the transceiving antenna. The radio frequency transceiving system based on the structural design can effectively improve the range of the surface acoustic wave sensor adapted to the radio frequency transceiving system, and can be widely applied to the technical fields of temperature detection and the like.
Description
Technical Field
The invention relates to a temperature detection technology, in particular to a temperature detection system based on a wireless passive surface acoustic wave sensor and a radio frequency transceiving system for constructing the temperature detection system.
Background
The surface acoustic wave sensor generally comprises a piezoelectric substrate, and an electrode and an antenna which are prepared on the piezoelectric substrate, and the common surface acoustic wave sensor is an interdigital transducer which utilizes the acoustic-electric conversion characteristic of a piezoelectric material to realize the mutual conversion of electromagnetic waves and acoustic surface waves, and has the advantages of being wireless and passive, and being capable of working in severe environments such as high temperature and the like; the wireless characteristic of the sensor enables the application scene of the sensor to break through the limitation of cables, so that the sensor can be arranged in the traditional positions where wires cannot be arranged, such as moving objects, to realize the detection of temperature waiting detection physical parameters, and the passive characteristic enables the sensor to be free of a battery arranged in the sensor, so that the sensor can better adapt to severe environments such as high temperature, strong acid and high voltage, and is convenient to maintain.
The sensing technology based on the wireless passive surface acoustic waves can be used in sensing scenes of temperature waiting detection parameters of large machines such as electrical instrument equipment and aeroengines. The wireless passive surface acoustic wave sensor system is generally composed of a radio frequency transceiving system and a surface acoustic wave sensor arranged at a measured object, wherein the radio frequency transceiving system and the surface acoustic wave sensor are respectively integrated with an antenna, the radio frequency transceiving system generates an inquiry radio frequency signal and sends the inquiry radio frequency signal to the surface acoustic wave sensor, the surface acoustic wave sensor receives the inquiry radio frequency signal and converts the inquiry radio frequency signal into a sound wave signal which propagates along the surface of a piezoelectric substrate, the transmission characteristic of the sound wave signal carries physical parameter information such as the temperature around the sensor and the like, the sound wave signal is converted into an electromagnetic wave signal again through the integrated antenna and sent to the radio frequency transceiving system, and the radio frequency transceiving system receives an echo signal returned by the sensor and analyzes the physical.
When the surface acoustic wave device is manufactured, the resonance center frequency of the surface acoustic wave device may deviate due to process reasons. Meanwhile, based on different application scenarios and different material characteristics of surface acoustic wave devices made of different materials, the center frequency of the actually prepared and used surface acoustic wave sensor has high dispersion, so that in the prior art, the surface acoustic wave sensors of the same type are generally required to be matched with a special radio frequency receiving and transmitting system.
Disclosure of Invention
The invention aims to provide a temperature detection system based on a wireless passive surface acoustic wave sensor, which is used for improving the adaptation range of a radio frequency transceiving system to the surface acoustic wave sensor;
another object of the present invention is to provide a radio frequency transceiver system for constructing the above temperature detection system.
In order to achieve the above object, the temperature detecting system provided by the present invention comprises a radio frequency transceiver system and a surface acoustic wave sensor disposed at a measured object, wherein the radio frequency transceiver system comprises a control unit, a man-machine interaction unit, a transceiver antenna, a transmitting link, a receiving link and a selection switch unit: the human-computer interaction unit is in communication connection with the control unit and is used for receiving setting input aiming at detection control parameters and outputting a temperature detection result under the control of the control unit; the receiving and transmitting antenna is a multi-frequency antenna; the transmitting link is controlled by the control unit and sequentially comprises a radio frequency signal generating module, a switch module, a frequency adaptation module and a power amplification module which are electrically connected along the advancing direction of a signal in the transmitting link, and the frequency adaptation module can be replaced; the receiving link is controlled by the control unit and sequentially comprises a filtering module, a signal amplification module and a power detection module which are electrically connected along the advancing direction of the signal in the receiving link, and the filtering module can be replaced; a selection switch unit for selectively connecting one of the transmission chain and the receiving chain with the transceiving antenna.
The radio frequency transceiving system based on the structural design can input detection control parameters through the human-computer interaction module according to different surface acoustic wave sensors, and selects the module matched with the surface acoustic wave sensor to replace the frequency adaptation module and the filtering module, so that the radio frequency transceiving system can be suitable for the surface acoustic wave sensors with different frequency bands and the change of detection environment, a large number of radio frequency transceiving systems do not need to be configured, and the cost is effectively saved. In addition, based on the setting of the switch module and the selection switch module, the transmitting signal and the response signal can be effectively isolated, so that the working stability and the detection accuracy of the system are improved.
The specific scheme is that the radio frequency signal generation module comprises a phase-locked loop module, the switch module is a one-way switch module, the selection switch unit comprises a single-pole double-throw switch module, the man-machine interaction unit comprises a touch screen, the signal amplification module is a variable gain amplification module, an analog-to-digital conversion module is arranged at the downstream of the power detection module, and the frequency adaptation module and the filtering module are both band-pass filtering modules.
The preferred scheme is that the detection control parameters comprise inquiry radio frequency signal group parameters matched with the surface acoustic wave sensor and a calculation formula for representing the conversion relation between the resonant frequency and the environment temperature of the surface acoustic wave sensor, and the inquiry radio frequency signal group parameters comprise radio frequency signal frequency bands and signal step lengths or signal quantity; the conversion relation is linear, and the signal step length is equal step length.
Another preferred solution is that the control unit comprises a processor and a memory, the memory storing a computer program, the computer program when executed by the processor being adapted to perform the steps of:
a receiving step of receiving a setting for a detection control parameter input through a human-computer interaction unit;
a receiving and transmitting step, controlling a transmitting link to transmit a group of inquiry radio frequency pulses through a receiving and transmitting antenna according to the detection control parameters, and controlling a receiving link to receive a group of response signals fed back by aiming at the group of inquiry radio frequency pulses through the receiving and transmitting antenna;
a processing step, namely acquiring the resonant frequency of the surface acoustic wave sensor based on a group of response signals;
and a calculating step of calculating the current temperature value of the measured object based on the resonance frequency acquired in the processing step.
In the transmitting and receiving step, a group of inquiry radio frequency pulses comprises a plurality of radio frequency pulses with gradually changed frequencies and the frequencies within a preset radio frequency signal frequency band; after receiving a response signal to the previous query radio frequency signal, transmitting a next query pulse signal; when the transmitting link is controlled to transmit the inquiry radio frequency signal, the switch module is controlled to be communicated and the selection switch is controlled to be connected with the transmitting link and the receiving and transmitting antenna; when the receiving link is controlled to receive the response signal, the switch module is controlled to be disconnected and the selection switch is controlled to be connected with the receiving link and the receiving and transmitting antenna; in the processing step, amplitude data which is output by the power detection module and used for representing the amplitude of the response signal is obtained, and the frequency of an inquiry radio-frequency signal corresponding to the maximum amplitude data in an amplitude data group corresponding to a group of inquiry radio-frequency pulses is taken as the resonant frequency of the surface acoustic wave sensor; in the processing step, a signal received within a predetermined time after transmission of a query radio frequency signal is taken as a response signal to the query radio frequency signal; in the calculation step, the current temperature is calculated by using the resonant frequency acquired in the processing step according to a calculation formula used for representing the conversion relation between the resonant frequency of the surface acoustic wave sensor and the ambient temperature in the received detection control parameters.
In order to achieve the other purpose, the radio frequency transceiving system provided by the invention is used for matching with a surface acoustic wave sensor, and comprises a control unit, a human-computer interaction unit, a transceiving antenna, a transmitting link, a receiving link and a selection switch unit; the man-machine interaction unit is in communication connection with the control unit and is used for receiving the setting input aiming at the receiving and sending control parameters and outputting the detection result under the control of the control unit; the receiving and transmitting antenna is a multi-frequency antenna; the transmitting link is controlled by the control unit and sequentially comprises a radio frequency signal generating module, a switch module, a frequency adaptation module and a power amplification module which are electrically connected along the advancing direction of a signal in the transmitting link, and the frequency adaptation module can be replaced; the receiving link is controlled by the control unit and sequentially comprises a filtering module, a signal amplification module and a power detection module which are electrically connected along the advancing direction of the signal in the receiving link, and the filtering module can be replaced; the selection switch unit is used for selectively connecting one of the transmitting chain and the receiving chain with the transceiving antenna.
The radio frequency transceiving system based on the structural design can input detection control parameters through the human-computer interaction module according to different surface acoustic wave sensors, and selects the module matched with the surface acoustic wave sensor to replace the frequency adaptation module and the filtering module, so that the radio frequency transceiving system can be suitable for the surface acoustic wave sensors with different frequency bands and the change of detection environment, a large number of radio frequency transceiving systems do not need to be configured, and the cost is effectively saved. In addition, based on the arrangement of the switch module and the selection switch module, the transmitting signal and the response signal can be effectively isolated, so that the working stability and the detection accuracy of the system are improved
The specific scheme is that the radio frequency signal generation module comprises a phase-locked loop module, the switch module is a one-way switch module, the selection switch unit comprises a single-pole double-throw switch module, the man-machine interaction unit comprises a touch screen, the signal amplification module is a variable gain amplification module, an analog-to-digital conversion module is arranged at the downstream of the power detection module, and the frequency adaptation module and the filtering module are both band-pass filtering modules.
The preferable scheme is that the receiving and sending control parameters comprise an inquiry radio frequency signal group parameter matched with the surface acoustic wave sensor and a calculation formula for representing the conversion relation between the resonant frequency of the surface acoustic wave sensor and the parameter to be detected, and the inquiry radio frequency signal group parameter comprises a radio frequency signal frequency band and a signal step length or signal quantity; the conversion relation is linear, and the signal step length is equal step length.
Another preferred solution is that the control unit comprises a processor and a memory, the memory storing a computer program, the computer program when executed by said processor being capable of performing the steps of:
a receiving step of receiving the setting of the receiving and sending control parameters input by a man-machine interaction unit;
a receiving and transmitting step, controlling a transmitting link to transmit a group of inquiry radio frequency pulses through a receiving and transmitting antenna according to the receiving and transmitting control parameters, and controlling a receiving link to receive a group of response signals fed back by aiming at the group of inquiry radio frequency pulses through the receiving and transmitting antenna;
a processing step, namely acquiring the resonant frequency of the surface acoustic wave sensor based on a group of response signals;
and a calculating step of calculating the current value of the parameter to be detected based on the resonance frequency acquired in the processing step.
In the transmitting and receiving step, a group of inquiry radio frequency pulses comprises a plurality of radio frequency pulses with gradually changed frequencies and the frequencies within a preset radio frequency signal frequency band; after receiving a response signal to the previous query radio frequency signal, transmitting a next query pulse signal; when the transmitting link is controlled to transmit the inquiry radio frequency signal, the switch module is controlled to be communicated and the selection switch is controlled to be connected with the transmitting link and the receiving and transmitting antenna; when the receiving link is controlled to receive the response signal, the switch module is controlled to be disconnected and the selection switch is controlled to be connected with the receiving link and the receiving and transmitting antenna; in the processing step, amplitude data which is output by the power detection module and used for representing the amplitude of the response signal is obtained, and the frequency of an inquiry radio-frequency signal corresponding to the maximum amplitude data in an amplitude data group corresponding to a group of inquiry radio-frequency pulses is taken as the resonant frequency of the surface acoustic wave sensor; in the processing step, a signal received within a predetermined time after transmission of a query radio frequency signal is taken as a response signal to the query radio frequency signal; in the calculating step, the current value of the parameter to be detected is calculated by utilizing the resonant frequency acquired in the processing step according to a calculation formula which is used for representing the conversion relation between the resonant frequency of the surface acoustic wave sensor and the parameter to be detected in the received transceiving control parameters.
Drawings
FIG. 1 is a schematic diagram of a schematic circuit structure of a temperature detection system according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a temperature detection operation performed by the temperature detection system according to the embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following examples and figures.
Temperature sensing System embodiments
Referring to fig. 1, the temperature detecting system 1 of the present invention includes a radio frequency transceiver system 2 and a surface acoustic wave sensor 3 disposed at a measured object, where the radio frequency transceiver system 2 includes a control unit 20, a human-computer interaction unit 21, a transmitting link 22, a receiving link 23, a selection switch unit 24, and a transceiver antenna 25.
The control unit 20 is an FPGA for controlling the whole rf transceiver system 2, and includes a processor and a memory, where the memory stores a computer program, and when the computer program is executed by the processor, the function of detecting the temperature is realized by controlling the operations of other units.
The human-computer interaction unit 21 is selected from a touch screen electrically connected to the control unit 20, and not only can be used for receiving data input, but also can be used for displaying a temperature detection result. Of course, the man-machine interaction unit 21 in the present embodiment may be also configured by a combination of a data input button and a speaker for outputting a temperature detection result instead of the touch screen.
Along the traveling direction of the signal in the transmission link 22, the transmission link 22 sequentially includes a phase-locked loop module 41, a unidirectional switch module 42, a frequency adaptation module 43 and a power amplification module 44, which are electrically connected, and the frequency adaptation module is replaceable and a band-pass filter module, that is, a band-pass filter module of a corresponding frequency band can be accessed according to actual needs, so as to selectively access the filter module of the corresponding frequency band in the transmission link 22. The phase-locked loop module 41 constitutes a radio frequency signal generating module in this embodiment, to generate a radio frequency signal with a corresponding frequency under the control of the control unit 20, and specifically adopts a chip module with a model number of ADF 4360-7; the unidirectional switch module 42 constitutes a switch module in the present embodiment, and is used for controlling the on-off between the phase-locked loop module 41 and the frequency adaptation module 43, and specifically selects a module with an ADG901 chip model; the frequency adaptation module 43 is used to enable the power amplification module 44 to have the best transmission performance at the current working frequency, and in order to enable the system to adapt to various surface acoustic wave sensors, a plurality of frequency adaptation modules with different frequency bands are integrated in the system, and specifically, a filtering module is selected as the frequency adaptation module in the embodiment, so that the frequency adaptation module with the corresponding frequency band is selectively accessed to adapt to the current surface acoustic wave sensor 3; the power amplification module 44 is configured to perform power amplification on the radio frequency signal generated by the phase-locked loop module 41, and specifically selects a module with a model of ADL 5324.
Along the advancing direction of the signal in the receiving link 23, the receiving link 23 sequentially includes a variable gain amplifying module 54, a filtering module 53, a power detecting module 52 and an analog-to-digital conversion module 51, which are electrically connected, and the filtering module is replaceable and a band-pass filtering module, that is, the band-pass filtering module of the corresponding frequency band can be accessed according to the actual requirement, that is, the filtering module of the corresponding frequency band is selectively accessed in the receiving link 23. The variable gain amplification module 54 constitutes a signal amplification module in this embodiment, which is a multi-stage power amplifier, and specifically selects a module with an ADL5243 model to amplify the response signal received by the transceiver antenna 25. The filtering module 53 is used for filtering noise generated by the variable power amplifier, reducing interference to the power detector, and for enabling the system to be adapted to various surface acoustic wave sensors, a plurality of filtering modules with different frequency bands are integrated in the system, so that the filtering modules with corresponding frequency bands are selectively accessed to adapt to the current surface acoustic wave sensor 3. The power detection module 52 is configured to obtain an amplitude of the received response signal after the gain processing, and specifically selects a chip module with a model number of ADL 5902. The analog-to-digital conversion module 51 is configured to convert the signal output by the power detection module 52 into an FPGA capable of processing a digital signal, and specifically selects a chip module whose signal is AD 7091.
The selection switch unit 24 is used for selectively connecting one of the transmission link 22 and the reception link 23 with the rf transceiving antenna 25, and can implement signal isolation between the reception link and the transmission link by matching with the one-way switch 41, and specifically selects a single-pole double-throw switch module with the model number of ADL 5324.
The transceiving antenna 25 is a multi-frequency antenna to match the transceiving tasks of the radio frequency signals of different frequency bands.
The surface acoustic wave sensor 3 is arranged at a measured object to realize wireless passive sensing detection, the working frequency of the surface acoustic wave sensor is selected according to actual needs, and the surface acoustic wave sensor with the working frequency of 433MHz is selected in the embodiment and comprises a piezoelectric substrate, and an interdigital electrode and a transmitting-receiving antenna electrode which are prepared on the piezoelectric substrate.
Referring to fig. 2, the method for temperature detection using the temperature detection system includes a receiving step S1, a transceiving step S2, a processing step S3 and a calculating step S4, i.e., the processor in the control unit 20 executes a computer program stored in the memory thereof to realize the foregoing steps for detecting the temperature of the object to be measured. The method comprises the following specific steps:
and a receiving step S1 of receiving the setting input for the detection control parameter through the man-machine interaction module.
In the temperature detection system, the detection control parameters comprise an inquiry radio frequency signal set parameter matched with the surface acoustic wave sensor and a calculation formula for representing the conversion relation between the resonant frequency of the surface acoustic wave sensor and the ambient temperature. The parameters of the query radio frequency signal group comprise a radio frequency signal frequency band and a signal step length or signal quantity, namely a frequency band matched with the current surface acoustic wave sensor 3, and a frequency step length of two adjacent radio frequency signals in a plurality of query radio frequency signals emitted in the detection process, so that the approximate temperature range to be measured of the object to be measured can be specifically considered, the range of the resonant frequency of the object to be measured is deduced according to an empirical formula, and the range of the resonant frequency is expanded in a preset fluctuation range to be used as the radio frequency signal frequency band. The step of acquiring the radio frequency signal frequency band comprises the steps of calculating the resonance frequency range of the surface acoustic wave sensor by using a calculation formula according to the estimated temperature fluctuation range of the measured object, and then expanding the interval of the resonance frequency range based on the preset fluctuation proportion to acquire the radio frequency signal frequency band. In this embodiment, in a certain temperature fluctuation range, the resonant frequency of the saw sensor 3 has a linear relationship with the temperature of the environment, and the signal step length is equal to the step length.
For the calculation formula, the obtaining step is based on the installation environment of the simulated surface acoustic wave sensor on the measured object, the measured data group corresponding to the resonant frequency of the surface acoustic wave sensor and the temperature of the measured object is utilized to fit the relation formula of the resonant frequency and the temperature to form the calculation formula, and curve fitting or linear fitting with more than two degrees is selected, and linear fitting is selected in the embodiment.
Specifically, according to the frequency band where the surface acoustic wave sensor 3 is located, a corresponding matched filter module is selected in the system as a frequency adaptation module 43 and a band pass filter network access signal path in the receiving link 23 as a filter module 53, then a radio frequency signal frequency band is set in the touch screen as a system control parameter, and a corresponding conversion algorithm of temperature-resonance frequency characteristics, i.e., a calculation formula, is selected, in this embodiment, a linear expression Y is AX + B, Y is temperature, and X is resonance frequency, i.e., an input parameter a and a parameter B.
A transceiving step S2, according to the detection control parameter, controlling the transmitting link to transmit a group of query rf pulses through the transceiving antenna, and controlling the receiving link to receive a group of response signals fed back for the group of query rf pulses through the transceiving antenna.
The group of inquiry radio frequency pulses comprise a plurality of radio frequency pulses with gradually changed frequencies and the frequencies within a preset radio frequency signal frequency band, namely a group of radio frequency signals with gradually increased frequencies generated according to the input radio frequency signal frequency band and the signal step length or the number of signals; when the transmission link 22 is controlled to transmit the inquiry radio frequency signal, the unidirectional switch module 42 is controlled to be communicated and the selection switch unit 24 is controlled to be connected with the transmission link 22 and the transceiving antenna 25; when the receiving link 23 is controlled to receive the response signal, the unidirectional switch module 42 is controlled to disconnect and the selection switch module 42 is controlled to connect the receiving link 23 and the transceiving antenna 25, that is, based on the cooperation between the unidirectional switch module 42 and the selection switch unit 24, the next query pulse signal is transmitted after the response signal for the previous query radio frequency signal is received.
The control selection switch unit 24 connects the transmission chain 22 with the transceiving antenna 25, and the transmission chain 22 operates. The phase-locked loop module 41 transmits a continuous signal with a required frequency through internal frequency doubling locking, outputs an inquiry radio frequency signal outwards at a fixed time interval through the on-off of the switch through the one-way switch module 42, and amplifies the inquiry radio frequency signal to a transmission power level through the power amplification module 44. The resulting signal is transmitted by the transmitting and receiving antenna 25 and received by the surface acoustic wave sensor 3.
The surface acoustic wave sensor 3 receives an inquiry radio frequency signal through a sensor antenna, converts an electric signal into an acoustic wave signal through an inverse piezoelectric effect, carries temperature information of an upper surface acoustic wave device when the acoustic wave signal is transmitted in the surface acoustic wave sensor 3, converts the acoustic wave signal with the temperature information into an electric signal through the positive piezoelectric effect, and finally feeds back a response signal through the sensor antenna.
After the query signal is ended, the selection switch unit 24 selects the connection of the transmission/reception antenna 25 to the reception link 23. At this time, the signal generated by the phase-locked loop module 41 is isolated by the unidirectional switch module 42 and the selection switch unit 24. The receiving and transmitting antenna 25 receives the echo signal with the temperature information returned by the surface acoustic wave sensor 3, and the receiving link 23 operates. The signal is first passed through a variable gain amplification block 54, which amplifies the signal to a power level detectable by the power detection block 52, and a power detection block 52, i.e., a logarithmic converter, which converts the signal strength to a voltage value. The converted voltage is converted by the analog-to-digital conversion module 51, and the digital quantity of the voltage is input back to the control unit 20.
The process step S3 acquires the resonance frequency of the surface acoustic wave sensor based on the set of response signals.
Amplitude data, which is output by the power detection module 52 and is used to characterize the amplitude of the response signal, is obtained, and the frequency of the interrogation radio frequency signal corresponding to the largest amplitude data in the amplitude data set corresponding to a group of interrogation radio frequency pulses is the current resonant frequency of the saw sensor. And requires that the signal received within a predetermined time after transmission of a query rf signal, in this embodiment 10 microseconds, be the response signal to the query rf signal.
The control unit 20 controls the pll module 41 to output different frequencies within an overall temperature measurement period, such as 432 plus 436MHz within a working range, and step-by-step scanning with 100kHz as a step; of course, shorter steps, such as 10Hz, may be used depending on the detection accuracy requirements. The inquiry radio frequency signal of each frequency is transmitted by the transmitting-receiving antenna 25, and then through the electro-acoustic conversion of the surface acoustic wave sensor 3, the resonance of the surface acoustic wave in the sensor selects echo, and the echo is converted back to an electric signal with temperature information. The rf signal strength of this echo is converted to a voltage and then to a digital quantity. During a large period, each time the receiver receives the first 10 μ s, the control unit 20 records and compares the returned digital values representing the response strength, and corresponds to the current frequency of the interrogation signal, wherein the frequency corresponding to the maximum response strength is the resonant frequency of the saw sensor measured by the rf transceiver system. According to the temperature-resonance frequency characteristic relation of the surface acoustic wave sensor 3 and the input calculation formula, the temperature corresponding to the frequency is the temperature of the environment where the sensor is located.
A calculation step S4 of calculating the current temperature of the object to be measured based on the resonance frequency acquired in the processing step.
And calculating the current temperature of the measured object by using the resonance frequency acquired in the processing step S3 according to a calculation formula which is used for representing the conversion relation between the resonance frequency of the surface acoustic wave sensor and the environment temperature in the received detection control parameters.
The control unit 20 outputs the processed temperature information to the human-computer interaction module 21 for display, and then re-enters step S2 to continue the next temperature measurement cycle. If the value output by the analog-to-digital conversion module 51 is small, that is, smaller than the preset proportional value of the measurement range, for example, smaller than 10% of the measurement range, it indicates that the received power is small, at this time, the control unit 20 controls the human-computer interaction module 21 to output a failure warning, for example, a warning is given through a speaker or a warning lamp matched with a touch screen, so as to prompt the distance between the radio frequency transceiver system 2 and the surface acoustic wave sensor 3, generally, 20 cm to 50 cm, and adjust the gain level of the variable power amplification module 54, and if the value output by the analog-to-digital conversion module 51 is small after multiple adjustments, that is, still smaller than the preset proportional value, which indicates that the function of the surface acoustic wave sensor is damaged, it outputs a.
Embodiments of radio frequency Transmit-receive System
The embodiment of the radio frequency transceiving system has been described in the above embodiment of the temperature detection system, and is not described herein again, where the detection control parameter constitutes a transceiving control parameter in this embodiment, and the calculation formula of the conversion relationship between the resonant frequency of the surface acoustic wave sensor and the ambient temperature constitutes a calculation formula of the conversion relationship between the resonant frequency of the surface acoustic wave sensor and the physical quantity to be detected in this embodiment, and is specifically set according to the physical quantity to be detected, where the physical quantity to be detected is a resonant frequency that can affect the surface acoustic wave sensor, and the change of the resonant frequency is in a one-to-one correspondence relationship with the physical quantity to be detected in a measurement range, and preferably, the physical quantity to be detected is in a substantially linear relationship.
Claims (10)
1. A temperature detection system based on wireless passive surface acoustic wave sensor comprises a radio frequency transceiving system and the surface acoustic wave sensor arranged at a measured object, and is characterized in that the radio frequency transceiving system comprises:
a control unit;
the human-computer interaction unit is in communication connection with the control unit and is used for receiving the setting input aiming at the detection control parameters and outputting the temperature detection result under the control of the control unit;
the receiving and transmitting antenna is a multi-frequency antenna;
the transmitting link is controlled by the control unit and sequentially comprises a radio frequency signal generating module, a switch module, a frequency adaptation module and a power amplification module which are electrically connected along the advancing direction of signals, the frequency adaptation module can be replaced, and the frequency adaptation module with a corresponding frequency band is selected from a plurality of frequency adaptation modules with different frequency bands to be accessed into the transmitting link so as to be matched with the current surface acoustic wave sensor;
the receiving link is controlled by the control unit and sequentially comprises a signal amplification module, a filtering module and a power detection module which are electrically connected along the advancing direction of a signal, the filtering module can be replaced, and the filtering module with a corresponding frequency band is selected from a plurality of filtering modules with different frequency bands to enter the receiving link so as to be matched with the current surface acoustic wave sensor;
a selection switch unit for selectively connecting one of the transmit chain and the receive chain with the transmit-receive antenna.
2. The temperature sensing system of claim 1, wherein:
the radio frequency signal generation module includes the phase-locked loop module, the switch module is the one-way switch module, the selection switch unit includes single-pole double-throw switch module, the human-computer interaction unit includes the touch-sensitive screen, the signal amplification module is variable gain amplification module, the low reaches of power detection module are equipped with the analog-to-digital conversion module, frequency adaptation module with the filtering module is band-pass filtering module.
3. The temperature sensing system of claim 1, wherein:
the detection control parameters comprise inquiry radio frequency signal group parameters matched with the surface acoustic wave sensor and a calculation formula for representing the conversion relation between the resonant frequency and the environment temperature of the surface acoustic wave sensor, and the inquiry radio frequency signal group parameters comprise radio frequency signal frequency bands and signal step lengths or signal quantity;
the conversion relation is a linear relation, and the signal step length is equal step length.
4. A temperature detection system according to any one of claims 1 to 3, wherein the control unit comprises a processor and a memory, the memory storing a computer program which, when executed by the processor, is operable to perform the steps of:
a receiving step of receiving a setting for the detection control parameter input through the human-computer interaction unit;
a transceiving step, controlling the transmitting link to transmit a group of query radio frequency pulses through the transceiving antenna according to the detection control parameter, and controlling the receiving link to receive a group of response signals fed back by the group of query radio frequency pulses through the transceiving antenna;
a processing step of acquiring the resonant frequency of the surface acoustic wave sensor based on the group of response signals;
and a calculating step of calculating a current temperature value of the measured object based on the resonance frequency acquired in the processing step.
5. The temperature sensing system of claim 4, wherein:
in the transceiving step, the group of inquiry radio frequency pulses comprises a plurality of radio frequency pulses with gradually changed frequencies and the frequencies within a preset radio frequency signal frequency band; after receiving a response signal to the previous query radio frequency signal, transmitting a next query pulse signal; when a transmitting link is controlled to transmit an inquiry radio frequency signal, the switch module is controlled to be communicated, and the selection switch unit is controlled to be connected with the transmitting link and the receiving and transmitting antenna; when the receiving link is controlled to receive the response signal, the switch module is controlled to be disconnected and the selection switch unit is controlled to be connected with the receiving link and the transceiving antenna;
in the processing step, amplitude data output by the power detection module and used for representing the amplitude of the response signal is obtained, and the frequency of the query radio frequency signal corresponding to the maximum amplitude data in the amplitude data group corresponding to the group of query radio frequency pulses is the resonant frequency of the surface acoustic wave sensor;
in the processing step, a signal received within a predetermined time after transmission of an inquiry radio frequency signal is taken as a response signal to the inquiry radio frequency signal;
in the calculating step, the resonance frequency acquired in the processing step is used for calculating the current temperature value according to a calculation formula which is used for representing the conversion relation between the resonance frequency of the surface acoustic wave sensor and the environment temperature in the received detection control parameters.
6. A radio frequency transceiver system for use with a wireless passive surface acoustic wave sensor, the radio frequency transceiver system comprising:
a control unit;
the human-computer interaction unit is in communication connection with the control unit and is used for receiving the setting input aiming at the receiving and sending control parameters and outputting the detection result under the control of the control unit;
the receiving and transmitting antenna is a multi-frequency antenna;
the transmitting link is controlled by the control unit and sequentially comprises a radio frequency signal generating module, a switch module, a frequency adaptation module and a power amplification module which are electrically connected along the advancing direction of signals, the frequency adaptation module can be replaced, and the frequency adaptation module with a corresponding frequency band is selected from a plurality of frequency adaptation modules with different frequency bands to be accessed into the transmitting link so as to be matched with the current surface acoustic wave sensor;
the receiving link is controlled by the control unit and sequentially comprises a filtering module, a signal amplification module and a power detection module which are electrically connected along the advancing direction of a signal, the filtering module can be replaced, and the filtering module with a corresponding frequency band is selected from a plurality of filtering modules with different frequency bands to enter the receiving link so as to be matched with the current surface acoustic wave sensor;
a selection switch unit for selectively connecting one of the transmit chain and the receive chain with the transmit-receive antenna.
7. The radio frequency transceiver system of claim 6, wherein:
the radio frequency signal generation module includes the phase-locked loop module, the switch module is the one-way switch module, the selection switch unit includes single-pole double-throw switch module, the human-computer interaction unit includes the touch-sensitive screen, the signal amplification module is variable gain amplification module, the low reaches of power detection module are equipped with the analog-to-digital conversion module, frequency adaptation module with the filtering module is band-pass filtering module.
8. The radio frequency transceiver system according to claim 6 or 7, wherein:
the receiving and sending control parameters comprise inquiry radio frequency signal group parameters matched with the surface acoustic wave sensor and a calculation formula for representing the conversion relation between the resonant frequency of the surface acoustic wave sensor and the parameters to be detected, and the inquiry radio frequency signal group parameters comprise radio frequency signal frequency bands and signal step lengths or signal quantity;
the conversion relation is a linear relation, and the signal step length is equal step length.
9. The radio frequency transceiver system of claim 8, wherein the control unit comprises a processor and a memory, the memory storing a computer program that when executed by the processor performs the steps of:
a receiving step of receiving a setting for the transceiving control parameter input through the human-computer interaction unit;
a transceiving step, controlling the transmitting link to transmit a group of inquiry radio frequency pulses through the transceiving antenna according to the transceiving control parameter, and controlling the receiving link to receive a group of response signals fed back by the group of inquiry radio frequency pulses through the transceiving antenna;
a processing step of acquiring the resonant frequency of the surface acoustic wave sensor based on the group of response signals;
and a calculating step of calculating the current value of the parameter to be detected based on the resonance frequency acquired in the processing step.
10. The radio frequency transceiver system of claim 9, wherein:
in the transceiving step, the group of inquiry radio frequency pulses comprises a plurality of radio frequency pulses with gradually changed frequencies and the frequencies within a preset radio frequency signal frequency band; after receiving a response signal to the previous query radio frequency signal, transmitting a next query pulse signal; when a transmitting link is controlled to transmit an inquiry radio frequency signal, the switch module is controlled to be communicated, and the selection switch unit is controlled to be connected with the transmitting link and the receiving and transmitting antenna; when the receiving link is controlled to receive the response signal, the switch module is controlled to be disconnected and the selection switch unit is controlled to be connected with the receiving link and the transceiving antenna;
in the processing step, amplitude data output by the power detection module and used for representing the amplitude of the response signal is obtained, and the frequency of the query radio frequency signal corresponding to the maximum amplitude data in the amplitude data group corresponding to the group of query radio frequency pulses is the resonant frequency of the surface acoustic wave sensor;
in the processing step, a signal received within a predetermined time after transmission of an inquiry radio frequency signal is taken as a response signal to the inquiry radio frequency signal;
in the calculating step, the current value is calculated by using the resonant frequency acquired in the processing step according to a calculation formula which is used for representing the conversion relation between the resonant frequency of the surface acoustic wave sensor and the parameter to be detected in the received transceiving control parameters.
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| CN110736557A (en) * | 2019-10-24 | 2020-01-31 | 深圳市三和电力科技有限公司 | data collector for passive wireless temperature transmission measuring system |
| CN112527029B (en) * | 2020-12-07 | 2022-03-18 | 上海卫星工程研究所 | Wireless passive temperature control system applied to satellite thermal control system |
| CN112617787A (en) * | 2020-12-16 | 2021-04-09 | 东南大学 | Passive wireless heart rhythm monitoring system based on radio frequency surface acoustic wave sensor |
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