CN114858303A - Surface acoustic wave sensor temperature measuring device and operation method and application thereof - Google Patents
Surface acoustic wave sensor temperature measuring device and operation method and application thereof Download PDFInfo
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- CN114858303A CN114858303A CN202210683683.XA CN202210683683A CN114858303A CN 114858303 A CN114858303 A CN 114858303A CN 202210683683 A CN202210683683 A CN 202210683683A CN 114858303 A CN114858303 A CN 114858303A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/22—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects
- G01K11/26—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects of resonant frequencies
- G01K11/265—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects of resonant frequencies using surface acoustic wave [SAW]
Abstract
The invention provides a surface acoustic wave sensor temperature measuring device and an operation method and application thereof, wherein the surface acoustic wave sensor temperature measuring device comprises a signal transceiver and a cable electrically connected with the signal transceiver; the middle part of the cable is provided with a switch, and the cable between the switch and the signal transceiver is electrically connected with at least two surface acoustic wave sensors. In the invention, a wired connection mode is adopted, and one signal transceiver is connected with a plurality of surface acoustic wave sensors, so that the signals of the plurality of surface acoustic wave sensors can be read without interference by a single signal transceiver; the surface acoustic wave sensor temperature measuring device is simple in structure and low in manufacturing cost.
Description
Technical Field
The invention belongs to the technical field of temperature detection, relates to a surface acoustic wave sensor temperature measuring device, and particularly relates to a surface acoustic wave sensor temperature measuring device and an operation method and application thereof.
Background
The working process of the traditional surface acoustic wave sensing and reading system is as follows: the reader-writer outputs energy by emitting electromagnetic waves, the surface acoustic wave sensor chip captures the electromagnetic wave energy through the antenna, the electromagnetic wave energy is converted into mechanical waves (surface acoustic waves) through the piezoelectric effect, the surface acoustic waves are processed on the chip, the energy is converted back into the electromagnetic waves through the inverse piezoelectric effect, the electromagnetic wave echo signals are emitted back to the reader-writer through the antenna, and the reader-writer demodulates and receives the electromagnetic wave echo signals, so that sensing of physical strength (such as temperature, strain and the like) of the position where the surface acoustic wave chip is located is achieved. The energy change process is as follows: electromagnetic waves-surface acoustic waves-electromagnetic waves.
Surface Acoustic Wave (SAW) wireless passive sensing chips (sensors) are based on the piezoelectric principle: the piezoelectric substrate is sensitive to the outside through frequency change reaction; chip identification is performed by frequency coding. The basic working process is as follows: the reader-writer sends a wireless signal through an antenna, the SAW sensing antenna receives the wireless signal and generates voltage on the SAW transducer, the voltage signal is converted into an acoustic signal through a piezoelectric effect, the transmitted acoustic signal is reflected back to the transducer through a coded reflector, and the transducer is converted into an electric signal through an inverse piezoelectric effect and returns to the antenna and then is transmitted to the reader-writer.
In the existing temperature measurement scheme of the SAW sensor, wireless communication is realized between a reader and a SAW sensor chip through an antenna. In the SAW sensor system using the wireless communication method, the number of sensor chips (symbol capacity) that can be simultaneously identified is small, and the requirement for multipoint temperature/strain measurement cannot be met.
CN109405887A discloses a surface acoustic wave sensor for measuring torque and temperature and a detection method, belonging to the field of surface acoustic wave sensors; the installation of temperature and torque sensors is time consuming and laborious; the sensor comprises a sensor substrate, wherein a zinc oxide thin film layer is arranged on the upper surface of the left side of the sensor substrate, a left interdigital transducer, a first reflecting grating, a second reflecting grating and a first sound absorption strip are arranged on the upper surface of the zinc oxide thin film layer, the first reflecting grating and the second reflecting grating are respectively arranged on two sides of the left interdigital transducer, the first sound absorption strip is arranged on the outer side of the first reflecting grating or the second reflecting grating, a right interdigital transducer, a third reflecting grating, a fourth reflecting grating and a second sound absorption strip are arranged on the upper surface of the right side of the sensor substrate, the third reflecting grating and the fourth reflecting grating are respectively arranged on two sides of the right interdigital transducer, and the second sound absorption strip is arranged on the outer side of the third reflecting grating or the fourth reflecting grating.
CN108344800A discloses a temperature detection system and send-receive system based on wireless passive surface acoustic wave sensor belongs to temperature detection technical field. 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.
CN102980679A discloses a device and a method for measuring the internal temperature of GIS equipment by a surface acoustic wave sensor, wherein the device consists of the surface acoustic wave sensor, a signal reader-writer, a wireless relay and a background monitoring system, and the surface acoustic wave sensor is arranged on a bus of the GIS equipment and is used for collecting the temperature change of a heating point; the signal reader-writer and the wireless relay are used for collecting temperature signals of the surface acoustic wave sensor and sending the temperature signals to the background monitoring system in a wired mode; and the background monitoring system carries out digital analysis processing on the temperature acquired by the sensor.
The temperature measuring device of the acoustic surface wave sensor disclosed at present has certain defects, and has the problems that the number of sensor chips identified at the same time is small, the measurement requirements of multipoint temperature or strain cannot be met, the structure is complex, and the preparation cost is high. Therefore, it is very important to develop and design a novel temperature measuring device of the surface acoustic wave sensor and an operation method thereof.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a surface acoustic wave sensor temperature measuring device and an operation method and application thereof, wherein a wired connection mode is adopted in the invention, and a signal transceiver is connected with a plurality of surface acoustic wave sensors, so that the interference-free reading of signals of the plurality of surface acoustic wave sensors by the single signal transceiver is realized; the surface acoustic wave sensor temperature measuring device is simple in structure and low in manufacturing cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a surface acoustic wave sensor temperature measuring device, which comprises a signal transceiver and a cable electrically connected with the signal transceiver;
the middle part of the cable is provided with a switch, and the cable between the switch and the signal transceiver is electrically connected with at least two surface acoustic wave sensors.
The length of a cable between the surface acoustic wave sensor and the signal transceiver is defined as L2, the length of a cable between the surface acoustic wave sensor and the switch is defined as L1, and the length from the switch to a section of the cable away from the signal transceiver is defined as L; when the switch is opened, the return signal generated by the surface acoustic wave sensor has two transmission paths on the cable; the first path is that the return signal is directly transmitted from the surface acoustic wave sensor to the signal transceiver through a cable, and the total transmission length is L2; the second path is that the return signal is transmitted from the surface acoustic wave sensor to a cable at a position corresponding to the switch, then returns from the cable at the position corresponding to the switch, and is transmitted to the signal transceiver through the cable, and the total transmission length is 2L1+ L2; if the difference 2L1 between the transmission lengths of the first path and the second path is equal to the odd number times of the half wavelength of the electromagnetic wave of the return signal, the signals with the phase difference of 180 degrees of the two paths will cancel out, the reader cannot receive the signals, at this time, the switch is closed, the transmission length of the second path becomes 2L +2L1+ L2(2L is the odd number times of the half wavelength of the electromagnetic wave), the phase difference of the signals is 0 degree, and the reader receives the return signal.
In the invention, a wired connection mode is adopted, and one signal transceiver is connected with a plurality of surface acoustic wave sensors, so that the signals of the plurality of surface acoustic wave sensors can be read without interference by a single signal transceiver; the surface acoustic wave sensor temperature measuring device is simple in structure and low in manufacturing cost.
As a preferred technical solution of the present invention, the signal transceiver includes a reader/writer.
The signal transceiver of the present invention transmits a transmission signal and receives a return signal.
As a preferred embodiment of the present invention, the cable includes a radio frequency coaxial cable.
As a preferred technical solution of the present invention, the saw sensor is electrically connected to the cable at intervals.
As a preferred embodiment of the present invention, the number of the saw sensors is less than twelve, and may be, for example, two, three, four, five, six, seven, eight, nine, ten, and eleven.
As a preferred embodiment of the present invention, the resonant frequency of each saw sensor is different.
The resonant frequencies of the surface acoustic wave sensors are different, when one surface acoustic wave sensor generates response, a return signal is generated, the resonant frequencies of the other surface acoustic wave sensors are different from the frequency of a sending signal, no return signal is generated, and the return signals of the different surface acoustic wave sensors are not interfered; by emitting different sending signals, return signals generated by different surface acoustic wave sensors can be received in sequence.
In a second aspect, the present invention provides an operating method of the surface acoustic wave sensor temperature measuring device according to the first aspect, the operating method including the steps of:
(1) a sending signal sent by the signal transceiver reaches all the surface acoustic wave sensors through the cable, the surface acoustic wave sensors with the same resonance frequency as the sending signal generate response and then generate a return signal, and the return signal is transmitted to the signal transceiver through the cable; the resonant frequency of the other surface acoustic wave sensors is different from the frequency of the transmitted signal, and no return signal is generated;
(2) if the signal transceiver receives the return signal, the on-off state of the switch does not need to be changed; and if the signal transceiver does not receive the return signal, the opening and closing state of the switch is changed, and the signal transceiver receives the return signal.
As a preferred technical solution of the present invention, the operation method further includes a repeated measurement after the step (2), the repeated measurement including: and (3) repeating the step (1) and the step (2), namely, the signal transceiver sends different sending signals each time, the surface acoustic wave sensors with different resonant frequencies generate return signals after responding under different sending signals, and the signal transceiver receives the return signals generated after all the surface acoustic wave sensors respond.
As a preferred technical solution of the present invention, the operation method includes the steps of:
(1) a sending signal sent by the reader-writer reaches all the surface acoustic wave sensors through the radio frequency coaxial cable, the surface acoustic wave sensors with the same resonance frequency as the sending signal generate response and then generate a return signal, and the return signal is transmitted to the reader-writer through the radio frequency coaxial cable; the resonant frequency of the other surface acoustic wave sensors is different from the frequency of the transmitted signal, and no return signal is generated;
(2) if the reader-writer receives the return signal, the on-off state of the switch does not need to be changed; if the reader-writer does not receive the return signal, changing the on-off state of the switch, and receiving the return signal by the reader-writer;
(3) and (3) repeating the step (1) and the step (2), namely, the reader sends different sending signals each time, the surface acoustic wave sensors with different resonant frequencies respond to the different sending signals to generate return signals, and the signal transceiver receives the return signals generated after all the surface acoustic wave sensors respond.
In a third aspect, the present invention provides a use of the surface acoustic wave sensor temperature measuring device according to the first aspect for measuring temperature.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, a wired connection mode is adopted, and one signal transceiver is connected with a plurality of surface acoustic wave sensors, so that the signals of the plurality of surface acoustic wave sensors can be read without interference by a single signal transceiver; the surface acoustic wave sensor temperature measuring device is simple in structure and low in manufacturing cost.
Drawings
Fig. 1 is a schematic structural diagram of a surface acoustic wave sensor temperature measuring device according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of transmission paths of a sending signal and a return signal according to an embodiment of the present invention.
Wherein, 1-a signal transceiver; 2-a cable; 3, switching; 4-surface acoustic wave sensor.
Detailed Description
It should be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected" and "connected" in the description of the present invention are to be construed broadly and may include, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical solution of the present invention is further explained by the following embodiments.
In one embodiment, as shown in fig. 1, the present invention provides a surface acoustic wave sensor temperature measuring device, which includes a signal transceiver 1 and a cable 2 electrically connected to the signal transceiver 1;
the middle part of the cable 2 is provided with a switch 3, and the cable 2 between the switch 3 and the signal transceiver 1 is electrically connected with at least two surface acoustic wave sensors 4.
As shown in fig. 2, the length of the cable 2 between the saw sensor 4 and the signal transceiver 1 is defined as L2, the length of the cable 2 between the saw sensor 4 and the switch 3 is defined as L1, and the length from the switch 3 to the cable 2 away from the signal transceiver 1 is defined as L; when the switch 3 is opened, the return signal generated by the surface acoustic wave sensor 4 has two transmission paths on the cable 2; the first path is that the return signal is directly transmitted from the surface acoustic wave sensor 4 to the signal transceiver 1 through the cable 2, and the total transmission length is L2; the second path is that the return signal is transmitted from the surface acoustic wave sensor 4 to the cable 2 at the position corresponding to the switch 3, then returns from the cable 2 at the position corresponding to the switch 3, and is transmitted to the signal transceiver 1 through the cable 2, and the total transmission length is 2L1+ L2; if the difference 2L1 between the transmission lengths of the first path and the second path is equal to the odd number times of the half wavelength of the electromagnetic wave of the return signal, the signals with the phase difference of 180 degrees of the two paths will cancel out, and the reader cannot receive the signals, at this time, the switch 3 is closed, the transmission length of the second path becomes 2L +2L1+ L2(2L is the odd number times of the half wavelength of the electromagnetic wave), the phase difference of the signals is 0 degree, and the reader receives the return signal.
In the invention, a wired connection mode is adopted, and one signal transceiver 1 is connected with a plurality of surface acoustic wave sensors 4, so that the interference-free reading of signals of the plurality of surface acoustic wave sensors 4 by a single signal transceiver 1 is realized; the surface acoustic wave sensor temperature measuring device is simple in structure and low in manufacturing cost.
Further, the signal transceiver 1 includes a reader/writer.
The signal transceiver 1 of the present invention transmits a transmission signal and receives a return signal.
Further, the cable 2 comprises a radio frequency coaxial cable.
Furthermore, the surface acoustic wave sensor 4 is electrically connected to the cable 2 at intervals.
Further, the number of the surface acoustic wave sensors 4 is less than twelve.
Further, the resonance frequency of each of the surface acoustic wave sensors 4 is different.
The resonant frequency of each surface acoustic wave sensor 4 is different, when one surface acoustic wave sensor 4 generates response, a return signal is generated, the resonant frequency of the other surface acoustic wave sensors 4 is different from the frequency of a sending signal, no return signal is generated, and the return signals of the different surface acoustic wave sensors 4 are not interfered; by emitting different transmission signals, return signals generated by different surface acoustic wave sensors 4 can be received in sequence.
In another embodiment, the present invention provides an operating method of a surface acoustic wave sensor temperature measuring device, the operating method including the steps of:
(1) a sending signal sent by the signal transceiver 1 reaches all the surface acoustic wave sensors 4 through the cable 2, the surface acoustic wave sensors 4 with the same resonance frequency as the sending signal generate response and then generate a return signal, and the return signal is transmitted to the signal transceiver 1 through the cable 2; the resonant frequency of the other surface acoustic wave sensors 4 is different from the frequency of the transmitted signal, and no return signal is generated;
(2) if the signal transceiver 1 receives the return signal, the on-off state of the switch does not need to be changed; if the signal transceiver 1 does not receive the return signal, the on-off state of the switch 3 is changed, and the signal transceiver 1 receives the return signal.
Further, the operating method further comprises a repeated measurement after the step (2), the repeated measurement comprising: and (3) repeating the step (1) and the step (2), namely, the signal transceiver 1 sends different sending signals each time, the surface acoustic wave sensors 4 with different resonant frequencies generate return signals after responding under different sending signals, and the signal transceiver 1 receives the return signals generated after all the surface acoustic wave sensors 4 respond.
Further, the operation method comprises the following steps:
(1) a sending signal sent by the reader-writer reaches all the surface acoustic wave sensors 4 through the radio frequency coaxial cable 2, the surface acoustic wave sensors 4 with the same resonance frequency as the sending signal generate response and then generate a return signal, and the return signal is transmitted to the reader-writer through the radio frequency coaxial cable; the resonant frequency of the other surface acoustic wave sensors 4 is different from the frequency of the transmitted signal, and no return signal is generated;
(2) if the reader-writer receives the return signal, the on-off state of the switch does not need to be changed; if the reader-writer does not receive the return signal, changing the on-off state of the switch 3, and receiving the return signal by the reader-writer;
(3) and (3) repeating the step (1) and the step (2), namely, the reader sends different sending signals each time, the surface acoustic wave sensors 4 with different resonant frequencies respond under different sending signals to generate return signals, and the signal transceiver 1 receives the return signals generated after all the surface acoustic wave sensors 4 respond.
In another embodiment, the invention provides a use of a saw sensor temperature measurement device for measuring temperature.
Application example 1
The application example provides an application of the surface acoustic wave sensor temperature measuring device shown in fig. 1 in temperature measurement:
(1) closing the switch, enabling a transmitting signal with the frequency of 432MHz emitted by the reader-writer to reach all the surface acoustic wave sensors 4 through the radio frequency coaxial cable 2, generating a return signal with the frequency of 432MHz after the surface acoustic wave sensors 4 with the resonant frequency of 432MHz generate response, and transmitting the return signal to the reader-writer through the radio frequency coaxial cable; the resonant frequency of the other surface acoustic wave sensors 4 is different from the frequency of the transmitted signal, and no return signal is generated;
(2) the reader-writer does not receive the return signal, the switch 3 is opened, and the reader-writer receives the return signal;
(3) a transmitting signal with the frequency of 433MHz emitted by the reader-writer reaches all the surface acoustic wave sensors 4 through the radio frequency coaxial cable 2, the surface acoustic wave sensors 4 with the resonant frequency of 433MHz generate a return signal with the frequency of 433MHz after responding, and the return signal is transmitted to the reader-writer through the radio frequency coaxial cable; the resonant frequency of the other surface acoustic wave sensors 4 is different from the frequency of the transmitted signal, and no return signal is generated;
(4) the reader-writer does not receive the return signal, the switch 3 is closed, and the reader-writer receives the return signal;
(5) a sending signal with the frequency of 434MHz emitted by the reader-writer reaches all the surface acoustic wave sensors 4 through the radio frequency coaxial cable 2, the surface acoustic wave sensors 4 with the resonant frequency of 434MHz generate a return signal with the frequency of 434MHz after responding, and the return signal is transmitted to the reader-writer through the radio frequency coaxial cable; the resonant frequency of the other surface acoustic wave sensors 4 is different from the frequency of the transmitted signal, and no return signal is generated;
(6) the reader-writer receives the return signal without changing the on-off state of the switch.
Application example 2
The application example provides an application of the surface acoustic wave sensor temperature measuring device shown in fig. 1 in temperature measurement:
(1) the switch is turned on, a transmitting signal with the frequency of 432MHz emitted by the reader-writer reaches all the surface acoustic wave sensors 4 through the radio frequency coaxial cable 2, the surface acoustic wave sensors 4 with the resonant frequency of 432MHz generate a return signal with the frequency of 432MHz after response, and the return signal is transmitted to the reader-writer through the radio frequency coaxial cable; the resonant frequency of the other surface acoustic wave sensors 4 is different from the frequency of the transmitted signal, and no return signal is generated;
(2) the reader-writer receives the return signal without changing the on-off state of the switch;
(3) a transmitting signal with the frequency of 433MHz emitted by the reader-writer reaches all the surface acoustic wave sensors 4 through the radio frequency coaxial cable 2, the surface acoustic wave sensors 4 with the resonant frequency of 433MHz generate a return signal with the frequency of 433MHz after responding, and the return signal is transmitted to the reader-writer through the radio frequency coaxial cable; the resonant frequency of the other surface acoustic wave sensors 4 is different from the frequency of the transmitted signal, and no return signal is generated;
(4) the reader-writer does not receive the return signal, the switch 3 is closed, and the reader-writer receives the return signal;
(5) a sending signal with the frequency of 434MHz emitted by the reader-writer reaches all the surface acoustic wave sensors 4 through the radio frequency coaxial cable 2, the surface acoustic wave sensors 4 with the resonant frequency of 434MHz generate a return signal with the frequency of 434MHz after responding, and the return signal is transmitted to the reader-writer through the radio frequency coaxial cable; the resonant frequency of the other surface acoustic wave sensors 4 is different from the frequency of the transmitted signal, and no return signal is generated;
(6) the reader-writer receives the return signal without changing the on-off state of the switch;
(7) a transmitting signal with 435MHz emitted by the reader-writer reaches all the surface acoustic wave sensors 4 through the radio frequency coaxial cable 2, the surface acoustic wave sensors 4 with 435MHz generate response and then generate return signals with 435MHz, and the return signals are transmitted to the reader-writer through the radio frequency coaxial cable; the resonant frequency of the other surface acoustic wave sensors 4 is different from the frequency of the transmitted signal, and no return signal is generated;
(8) the reader-writer receives the return signal without changing the on-off state of the switch;
(9) a sending signal with the frequency of 436MHz emitted by the reader-writer reaches all the surface acoustic wave sensors 4 through the radio frequency coaxial cable 2, the surface acoustic wave sensors 4 with the resonant frequency of 436MHz generate a return signal with the frequency of 436MHz after response, and the return signal is transmitted to the reader-writer through the radio frequency coaxial cable; the resonant frequency of the other surface acoustic wave sensors 4 is different from the frequency of the transmitted signal, and no return signal is generated;
(10) the reader-writer does not receive the return signal, the switch 3 is turned on, and the reader-writer receives the return signal.
Application example 3
The application example provides an application of the surface acoustic wave sensor temperature measuring device shown in fig. 1 in temperature measurement:
(1) closing the switch, enabling a transmitting signal with the frequency of 432MHz emitted by the reader-writer to reach all the surface acoustic wave sensors 4 through the radio frequency coaxial cable 2, enabling the surface acoustic wave sensors 4 with the resonant frequency of … to generate a return signal with the frequency of 432MHz after response, and transmitting the return signal to the reader-writer through the radio frequency coaxial cable; the resonant frequency of the other surface acoustic wave sensors 4 is different from the frequency of the transmitted signal, and no return signal is generated;
(2) the reader-writer does not receive the return signal, the switch 3 is turned on, and the reader-writer receives the return signal;
(3) a transmitting signal with the frequency of 433MHz transmitted by the reader-writer reaches all the surface acoustic wave sensors 4 through the radio frequency coaxial cable 2, the surface acoustic wave sensors 4 with the resonant frequency of 433MHz generate a return signal with the frequency of 433MHz after generating response, and the return signal is transmitted to the reader-writer through the radio frequency coaxial cable; the resonant frequency of the other surface acoustic wave sensors 4 is different from the frequency of the transmitted signal, and no return signal is generated;
(4) the reader-writer receives the return signal without changing the on-off state of the switch;
(5) a sending signal with the frequency of 434MHz emitted by the reader-writer reaches all the surface acoustic wave sensors 4 through the radio frequency coaxial cable 2, the surface acoustic wave sensors 4 with the resonant frequency of 434MHz generate a return signal with the frequency of 434MHz after responding, and the return signal is transmitted to the reader-writer through the radio frequency coaxial cable; the resonant frequency of the other surface acoustic wave sensors 4 is different from the frequency of the transmitted signal, and no return signal is generated;
(6) the reader-writer receives the return signal without changing the on-off state of the switch;
(7) a transmitting signal with 435MHz emitted by the reader-writer reaches all the surface acoustic wave sensors 4 through the radio frequency coaxial cable 2, the surface acoustic wave sensors 4 with 435MHz generate response and then generate return signals with 435MHz, and the return signals are transmitted to the reader-writer through the radio frequency coaxial cable; the resonant frequency of the other surface acoustic wave sensors 4 is different from the frequency of the transmitted signal, and no return signal is generated;
(8) the reader-writer receives the return signal without changing the on-off state of the switch;
(9) a sending signal with the frequency of 436MHz emitted by the reader-writer reaches all the surface acoustic wave sensors 4 through the radio frequency coaxial cable 2, the surface acoustic wave sensors 4 with the resonant frequency of 436MHz generate a return signal with the frequency of 436MHz after response, and the return signal is transmitted to the reader-writer through the radio frequency coaxial cable; the resonant frequency of the other surface acoustic wave sensors 4 is different from the frequency of the transmitted signal, and no return signal is generated;
(10) the reader-writer receives the return signal without changing the on-off state of the switch.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. A surface acoustic wave sensor temperature measuring device is characterized by comprising a signal transceiver and a cable electrically connected with the signal transceiver;
the middle part of the cable is provided with a switch, and the cable between the switch and the signal transceiver is electrically connected with at least two surface acoustic wave sensors.
2. The surface acoustic wave sensor temperature measurement device according to claim 1, wherein the signal transceiver includes a reader/writer.
3. The surface acoustic wave sensor temperature measurement device according to claim 1 or 2, wherein the cable includes a radio frequency coaxial cable.
4. A surface acoustic wave sensor temperature measuring device as set forth in any one of claims 1 to 3, wherein said surface acoustic wave sensor is electrically connected to a cable at intervals.
5. The surface acoustic wave sensor temperature measurement device according to any one of claims 1 to 4, wherein the number of surface acoustic wave sensors is less than twelve.
6. A surface acoustic wave sensor temperature measuring device according to any one of claims 1 to 5, wherein a resonance frequency of each of said surface acoustic wave sensors is different.
7. A method for operating a surface acoustic wave sensor temperature measuring device according to any of claims 1 to 6, characterized by comprising the steps of:
(1) a sending signal sent by the signal transceiver reaches all the surface acoustic wave sensors through the cable, the surface acoustic wave sensors with the same resonance frequency as the sending signal generate response and then generate a return signal, and the return signal is transmitted to the signal transceiver through the cable; the resonant frequency of the other surface acoustic wave sensors is different from the frequency of the transmitted signal, and no return signal is generated;
(2) if the signal transceiver receives the return signal, the on-off state of the switch does not need to be changed; and if the signal transceiver does not receive the return signal, the opening and closing state of the switch is changed, and the signal transceiver receives the return signal.
8. The method of operation of claim 7, further comprising repeating the measuring after step (2), the repeating comprising: and (3) repeating the step (1) and the step (2), namely, the signal transceiver sends different sending signals each time, the surface acoustic wave sensors with different resonant frequencies generate return signals after responding under different sending signals, and the signal transceiver receives the return signals generated after all the surface acoustic wave sensors respond.
9. Operating method according to claim 7 or 8, characterized in that it comprises the following steps:
(1) a sending signal sent by the reader-writer reaches all the surface acoustic wave sensors through the radio frequency coaxial cable, the surface acoustic wave sensors with the same resonance frequency as the sending signal generate response and then generate a return signal, and the return signal is transmitted to the reader-writer through the radio frequency coaxial cable; the resonant frequency of the other surface acoustic wave sensors is different from the frequency of the transmitted signal, and no return signal is generated;
(2) if the reader-writer receives the return signal, the on-off state of the switch does not need to be changed; if the reader-writer does not receive the return signal, changing the on-off state of the switch, and receiving the return signal by the reader-writer;
(3) and (3) repeating the step (1) and the step (2), namely, the reader sends different sending signals each time, the surface acoustic wave sensors with different resonant frequencies respond to the different sending signals to generate return signals, and the signal transceiver receives the return signals generated after all the surface acoustic wave sensors respond.
10. Use of the surface acoustic wave sensor temperature measurement device according to any of claims 1 to 6, for measuring temperature.
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| CN202210683683.XA CN114858303A (en) | 2022-06-16 | 2022-06-16 | Surface acoustic wave sensor temperature measuring device and operation method and application thereof |
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| CN202210683683.XA CN114858303A (en) | 2022-06-16 | 2022-06-16 | Surface acoustic wave sensor temperature measuring device and operation method and application thereof |
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