CN211013271U - Temperature measuring device based on passive wireless temperature sensor - Google Patents
Temperature measuring device based on passive wireless temperature sensor Download PDFInfo
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- CN211013271U CN211013271U CN201922257422.8U CN201922257422U CN211013271U CN 211013271 U CN211013271 U CN 211013271U CN 201922257422 U CN201922257422 U CN 201922257422U CN 211013271 U CN211013271 U CN 211013271U
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Abstract
The utility model provides a temperature measuring device based on passive wireless temperature sensor. The utility model provides a temperature measuring device based on passive wireless temperature sensor, wherein, including passive wireless temperature sensor, read arithmetic element, display element and communication unit, passive wireless temperature sensor passes through the antenna to read arithmetic element transmission signal, read arithmetic element with the display element is connected, read arithmetic element with the communication unit is connected. The utility model discloses can improve passive wireless temperature sensor and read the precision of arithmetic unit in the temperature measurement reading process.
Description
Technical Field
The utility model relates to a sensor temperature measurement technical field, more specifically relates to a temperature measuring device based on passive wireless temperature sensor.
Background
At present, a common wireless temperature sensor comprises an insulating shell, a piezoelectric material as a substrate and a resonant circuit, wherein the resonant circuit comprises an interdigital transducer and reflection gratings, the interdigital transducer is connected with an antenna to receive signals, due to the inverse piezoelectric effect of the piezoelectric material of the substrate, surface acoustic waves are generated on the surface of the substrate, the waves propagate to the two sides of the interdigital transducer along the surface of the substrate, when one reflection grating is encountered, a part of the waves are reflected back, the other part of the waves continuously propagate through the reflection gratings to perform coherent superposition between echo signals reflected by the reflection gratings, the reflected surface acoustic waves are converted into signals through a sensor antenna to be transmitted through the forward piezoelectric effect of the interdigital transducer, a reader-writer receives and detects frequency information, and the frequency value of the echo signals reflects the temperature information of a detection point of the sensor.
The existing problem is that the reading operation unit only receives a signal sent by a resonant circuit, so that the measured temperature may have a plus or minus 5 ℃ error with the actual temperature, even the numerical value cannot be read out under special conditions, the precision is low, if the measurement precision is to be improved, the reading operation unit needs to carry out multiple full-band scanning to obtain a relatively accurate temperature value, but when the number of passive sensors is large, the reading efficiency is reduced. Meanwhile, when the oscillation circuit is damaged or fails, the reading operation unit cannot read out the temperature value to be measured.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome current passive wireless temperature sensor and read the shortcoming that the operation unit complex in-process is low to the temperature measurement reading precision, provide a temperature measuring device based on passive wireless temperature sensor. The utility model discloses can improve passive wireless temperature sensor and read the precision of arithmetic unit in the temperature measurement reading process.
In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a temperature measuring device based on passive wireless temperature sensor, wherein, includes passive wireless temperature sensor, reads arithmetic element, display element and communication unit, passive wireless temperature sensor pass through the antenna to read arithmetic element transmission signal, read arithmetic element with the display element is connected, read arithmetic element with the communication unit is connected. Among this technical scheme, passive wireless temperature sensor places on the surface of the temperature object that awaits measuring, passive wireless temperature sensor changes the data that record into the signal and transmits by the antenna, read the signal of arithmetic unit receiving antenna transmission, read the signal that arithmetic unit will receive and read the analysis calculation, read the data transmission after the arithmetic unit will analyze the calculation and carry out the demonstration to the display element in, still transmit the communication unit, the communication unit carries data transport and carries out real-time supervision on operator's the mobile client, for example, mobile client APP.
Further, passive wireless temperature sensor includes insulating casing, first interdigital transducer, second interdigital transducer, third interdigital transducer, antenna and wafer base, first interdigital transducer, second interdigital transducer, third interdigital transducer are located on the wafer base, the both sides of every interdigital transducer are equallyd divide and do not are equipped with the reflection grating, first interdigital transducer, second interdigital transducer, third interdigital transducer all with the antenna is connected, the wafer base is located inside the insulating casing, the antenna is followed the inside wearing out of insulating casing. The three interdigital transducers can receive and send signals through the antenna, and the interval and the width of the reflection deletion are adjusted to enable the signal response frequency intervals generated by the three interdigital transducers to be adjacent and close but not intersect.
Further, the first interdigital transducer, the second interdigital transducer and the third interdigital transducer are integrated on the wafer substrate. The first interdigital transducer, the second interdigital transducer, the third interdigital transducer and the reflection gratings on the two sides of each interdigital transducer form three resonance circuits. The reading operation unit performs reading operation on the radio frequency signal generated by the resonant circuit, and the relationship between the frequency of the passive wireless temperature sensor responding to the radio frequency signal and the scanning frequency of the reading operation unit is as follows:
wherein N is the logarithm of the reflective grating, omega0Is the central resonance frequency of the sensor, Δ ω is the difference between the scanning frequency from the reader and the central resonance frequency, E0，ESNormalized electric field strength and induced electric field strength, respectively. The reading operation unit determines a large interval comprising the lowest frequency and the highest frequency of signal response frequency intervals generated by the first interdigital transducer, the second interdigital transducer and the third interdigital transducer according to the radio-frequency signals, and then the reading operation unit performs frequency scanning on the large frequency interval. Under normal conditions, the reading operation unit can obtain 3 central frequencies in a frequency interval with the scanned 3 frequency responses exceeding-10 dB, obtains 3 temperature values by analyzing the central frequencies through comparing reference frequencies, and then carries out weighted average on the 3 temperature valuesIf one of the temperature values differs from the other two temperature values by more than +/-3 ℃, the temperature value is discarded.
Furthermore, the insulating shell is made of resin materials, the display unit is an L ED electronic display screen, the communication unit is a 4G communication module, a mobile phone card socket is arranged on the 4G communication module, an internet of things card is arranged on the mobile phone card socket, and the antenna is made of aluminum alloy materials.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses an at the inside first interdigital transducer, second interdigital transducer, third interdigital transducer and the reflecting grating that sets up of passive wireless temperature sensor to produce three radio frequency, read the radio frequency interval of arithmetic unit through reading and obtain three temperature data, filter the calculation with temperature data again, thereby solved the data singleness and lacked the not enough of reference contrast, improved the measurement accuracy to the object temperature.
Drawings
Fig. 1 is a block diagram of a temperature measuring device based on a passive wireless temperature sensor.
FIG. 2 is a schematic structural diagram of a passive wireless temperature sensor in a temperature measuring device based on the passive wireless temperature sensor
The graphic symbols are illustrated as follows:
1-antenna, 2-first interdigital transducer, 3 reflective grating, 4-chip substrate.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Fig. 1 to fig. 2 show an embodiment of a temperature measuring device based on a passive wireless temperature sensor according to the present invention. The embodiment of the temperature measuring device based on the passive wireless temperature sensor comprises the passive wireless temperature sensor, a reading operation unit, a display unit and a communication unit, wherein the passive wireless temperature sensor transmits signals to the reading operation unit through an antenna, the reading operation unit is connected with the display unit, and the reading operation unit is connected with the communication unit.
The wireless passive temperature sensor comprises an insulating shell, a first interdigital transducer 2, a second interdigital transducer, a third interdigital transducer, an antenna 1 and a wafer substrate 4, wherein the first interdigital transducer, the second interdigital transducer and the third interdigital transducer are located on the wafer substrate 4, the first interdigital transducer, the second interdigital transducer and the third interdigital transducer are connected with the same antenna 1, two sides of each interdigital transducer are respectively provided with a reflection grating 3, each interdigital transducer and the reflection gratings 3 on the two sides of each interdigital transducer form a resonant circuit, and each resonant circuit generates a radio-frequency signal.
In addition, the display unit adopts an L ED electronic display screen, the communication unit adopts a 4G communication module, and the relationship between the frequency of the passive wireless temperature sensor responding to the radio frequency signal and the scanning frequency of the reading operation unit is as follows:
wherein N is the logarithm of 3 reflective grating, omega0Is the central resonance frequency of the sensor, Δ ω is the difference between the scanning frequency from the reader and the central resonance frequency, E0，ESNormalized electric field strength and induced electric field strength, respectively. The reading operation unit determines a large interval comprising the lowest frequency and the highest frequency of signal response frequency intervals generated by the first interdigital transducer 1, the second interdigital transducer and the third interdigital transducer according to the radio-frequency signals, and then the reading operation unit performs frequency scanning on the large frequency interval. Under normal conditions, the reading operation unit can obtain 3 central frequencies in a frequency interval with the scanned 3 frequency responses exceeding-10 dB, the central frequencies are analyzed by comparing the reference frequencies to obtain 3 temperature values, and then the reference frequencies are compared to obtain the temperature valueCarry out weighted average to 3 temperature values, if one of them temperature value and two other temperature values differ more than + -3 ℃ then abandon, will read the calculation result that the arithmetic element reachs and show L ED electronic display screen to the display element, transmit the result to the cell-phone APP of operator through 4G communication module simultaneously and carry out real time monitoring record.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. The utility model provides a temperature measuring device based on passive wireless temperature sensor which characterized in that: including passive wireless temperature sensor, reading arithmetic element, display element and communication unit, passive wireless temperature sensor pass through the antenna to reading arithmetic element transmission signal, read arithmetic element with the display element connects, read arithmetic element with the communication unit connects, passive wireless temperature sensor includes insulating casing, first interdigital transducer, second interdigital transducer, third interdigital transducer, antenna and wafer basement, first interdigital transducer, second interdigital transducer, third interdigital transducer are located on the wafer basement, the both sides of every interdigital transducer are equallyd divide and are equipped with the reflection grating respectively, first interdigital transducer, second interdigital transducer, third interdigital transducer all with the antenna is connected, the wafer basement is located inside the insulating casing, the antenna penetrates out of the insulating shell.
2. The temperature measuring device based on the passive wireless temperature sensor as claimed in claim 1, wherein: the first interdigital transducer, the second interdigital transducer and the third interdigital transducer are integrated on the wafer substrate.
3. The temperature measuring device based on the passive wireless temperature sensor as claimed in claim 2, wherein: the first interdigital transducer, the second interdigital transducer, the third interdigital transducer and the reflection gratings on the two sides of each interdigital transducer form three resonance circuits.
4. The temperature measuring device based on the passive wireless temperature sensor as claimed in claim 1, wherein: the insulating shell is made of resin materials.
5. The temperature measuring device based on the passive wireless temperature sensor as claimed in claim 4, wherein the display unit adopts an L ED electronic display screen.
6. The temperature measuring device based on the passive wireless temperature sensor as claimed in claim 5, wherein: the communication unit adopts a 4G communication module.
7. The temperature measuring device based on the passive wireless temperature sensor as claimed in claim 6, wherein: and a mobile phone card socket is arranged on the 4G communication module.
8. The temperature measuring device based on the passive wireless temperature sensor as claimed in claim 7, wherein: and an internet of things card is arranged on the mobile phone card socket.
9. The temperature measuring device based on the passive wireless temperature sensor as claimed in claim 1, wherein: the antenna is made of an aluminum alloy material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922257422.8U CN211013271U (en) | 2019-12-13 | 2019-12-13 | Temperature measuring device based on passive wireless temperature sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922257422.8U CN211013271U (en) | 2019-12-13 | 2019-12-13 | Temperature measuring device based on passive wireless temperature sensor |
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| Publication Number | Publication Date |
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| CN211013271U true CN211013271U (en) | 2020-07-14 |
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| CN201922257422.8U Active CN211013271U (en) | 2019-12-13 | 2019-12-13 | Temperature measuring device based on passive wireless temperature sensor |
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