CN112729588A - Miniature passive wireless temperature sensor and temperature measurement system - Google Patents
Miniature passive wireless temperature sensor and temperature measurement system Download PDFInfo
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- CN112729588A CN112729588A CN202011565725.7A CN202011565725A CN112729588A CN 112729588 A CN112729588 A CN 112729588A CN 202011565725 A CN202011565725 A CN 202011565725A CN 112729588 A CN112729588 A CN 112729588A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
- G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
- G01K7/245—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit in an oscillator circuit
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Abstract
The utility model discloses a miniature passive wireless temperature sensor and temperature measurement system, include, go up power supply board, lower power supply polar plate and mainboard, set up power supply circuit and radio frequency circuit on the mainboard, go up power supply board and lower power supply polar plate and pass through feed column and power supply circuit connection, power supply circuit supplies power for the radio frequency circuit, and the radio frequency circuit contains electric capacity three-point oscillator, contains thermistor in the electric capacity three-point oscillator, and thermistor changes along with the temperature change resistance and takes place the change, makes electric capacity three-point oscillator send the frequency modulation signal. The power supply polar plate generates electric potential, the electric potential is rectified and stabilized by the current circuit to supply power for the radio frequency circuit, temperature detection is realized by the radio frequency circuit, and an external power supply connecting wire is omitted.
Description
Technical Field
The invention relates to the technical field of temperature detection, in particular to a miniature passive wireless temperature sensor and a temperature measuring system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In the field of high-energy electric field temperature monitoring, the electric field potential is up to more than 1000V/m, and the power supply of the sensor equipment gets electricity and has certain danger. The inventor considers that the prior temperature measuring sensor has the following technical problems: firstly, a sensor data acquisition system is complex and comprises a single chip microcomputer system, so that the power consumption is large; the temperature sensor with wireless function must be equipped with a radio frequency chip to further increase the complexity of the system; secondly, the power supply mode of the temperature acquisition system has huge wiring workload and complicated circuit when the number of temperature monitoring nodes is huge; when a battery is used for supplying power to the temperature acquisition system, although wiring is reduced, the battery cannot be used for supplying power to meet long-time cruising operation on the premise of small volume; thirdly, a common temperature acquisition system is provided with a plastic shell and is easy to age under the direct irradiation condition of outdoor ultraviolet rays; fourthly, the temperature acquisition system returns the current wired mode mainly adopting bus return, or common wireless communication modes such as Lora and WIFI are adopted, especially chips required by common wireless communication are adopted, peripheral circuits are complex, and manufacturing cost is high. Fifthly, the temperature sensor adopting the single chip microcomputer can not work normally in severe weather, the working temperature and the working humidity of the common single chip microcomputer have special requirements, and equipment is easy to age under the field condition.
Disclosure of Invention
In order to solve the problems, the invention provides a miniature passive wireless temperature sensor and a temperature measurement system.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
according to the first aspect, the miniature passive wireless temperature sensor comprises an upper power supply plate, a lower power supply plate and a main board, wherein a power circuit and a radio frequency circuit are arranged on the main board, the upper power supply plate and the lower power supply plate are connected with the power circuit through a feed column, the power circuit supplies power for the radio frequency circuit, the radio frequency circuit comprises a capacitance three-point oscillator, the capacitance three-point oscillator comprises a thermistor, and the resistance value of the thermistor changes along with the temperature change, so that the capacitance three-point oscillator sends a frequency modulation signal to realize temperature measurement.
Further, the capacitance three-point oscillator comprises a triode, the base electrode of the triode is connected with an LC resonance circuit, a frequency modulation signal is sent out through the LC resonance circuit, a thermistor and a filter capacitor are connected in series between the collector electrode and the emitter electrode of the triode, and an inductor is connected in parallel with a series circuit formed by the thermistor and the filter capacitor.
Furthermore, the thermistor is connected with a power circuit, and the voltage provided by the power circuit is loaded on the triode through the thermistor.
Furthermore, the thermistor is connected with a resistor R4, a capacitor C9, a capacitor C6 and a resistor R6 in parallel in sequence.
Furthermore, a parallel circuit formed by an upper damping resistor and a lower damping resistor is connected between the thermistor and the power circuit.
Furthermore, a radio frequency antenna is arranged on the mainboard and used for receiving the frequency modulation signal and sending the frequency modulation signal.
Furthermore, the power circuit comprises a rectifying circuit and a voltage stabilizing circuit, the rectifying circuit is connected with the upper power plate and the lower power plate through the feed column, the voltage stabilizing circuit is connected with the rectifying circuit, and the rectifying circuit is connected with the capacitance three-point oscillator.
Furthermore, the upper electrode plate is connected with the upper electrode bottom plate, the lower electrode plate is connected with the lower electrode bottom plate, the upper electrode bottom plate, the lower electrode bottom plate and the main board are fixed above the base through the insulating support columns, the base is connected with the shell, and the upper electrode plate, the lower electrode plate and the main board are all located in the shell.
Furthermore, a threaded blind hole is formed below the base.
In a second aspect, a micro passive wireless temperature measurement system is provided, which comprises the micro passive wireless temperature sensor.
Compared with the prior art, the beneficial effect of this disclosure is:
1. according to the temperature detection device, the electric potential is generated through the power supply polar plate, the power supply circuit is used for supplying power to the radio frequency circuit after rectification and voltage stabilization, the temperature detection is realized through the radio frequency circuit, an external power supply connecting wire is omitted, and the temperature detection device can adapt to long-time use in the field.
2. The temperature detection is realized by the thermistor in the radio frequency circuit, the control chip is not arranged on the mainboard, all the control chip are analog circuits, and the power consumption is low.
3. According to the radio frequency circuit, when the power supply polar plate generates electric potential to supply power to the radio frequency circuit, the power supply circuit is added, the electric potential is rectified and stabilized by the power supply circuit to supply power to the radio frequency circuit, and the working stability of the radio frequency circuit is improved.
4. The high-frequency noise suppression circuit is characterized in that a parallel circuit formed by an upper damping resistor and a lower damping resistor is connected between the thermistor and the power circuit, high-frequency noise waves and adjusting current are filtered through the upper damping resistor and the lower damping resistor, and the thermistor is sequentially connected with a resistor R4, a capacitor C9, a capacitor C6 and a resistor R6 in parallel to suppress high frequency, so that the generation of high-frequency signals is reduced, and the anti-interference capability of the radio-frequency circuit is improved.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a schematic structural view of embodiment 1 of the present disclosure after the upper case is removed;
fig. 2 is a schematic overall structure diagram of embodiment 1 of the present disclosure;
fig. 3 is a schematic view of the overall structure of embodiment 1 of the present disclosure;
fig. 4 is a schematic circuit diagram of a motherboard in embodiment 1 of the disclosure;
FIG. 5 is a schematic diagram of a rectifier circuit according to embodiment 1 of the disclosure;
FIG. 6 is a schematic diagram of a voltage regulator circuit according to an embodiment 1 of the disclosure;
fig. 7 is a schematic diagram of a radio frequency circuit according to embodiment 1 of the present disclosure.
Wherein: 1. the circuit comprises a base, 2, an upper shell, 3, a threaded blind hole, 4, an upper electrode baseplate, 5, an upper electrode plate, 6, an insulating support column, 7, a lower electrode baseplate, 8, a lower electrode plate, 9, an upper electrode feed column, 10, a lower electrode feed column, 11, a mainboard, 12 and a mainboard circuit.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only relational terms determined for convenience in describing structural relationships of the parts or elements of the present disclosure, and do not refer to any parts or elements of the present disclosure, and are not to be construed as limiting the present disclosure.
In the present disclosure, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present disclosure can be determined on a case-by-case basis by persons skilled in the relevant art or technicians, and are not to be construed as limitations of the present disclosure.
Example 1
In this embodiment, a miniature passive wireless temperature sensor is disclosed, as shown in fig. 1-7, comprising a housing, and a main board 11 and a power supply plate disposed in the housing.
As shown in fig. 2, the housing includes a base 1 and an upper case 2, the base 1 is hermetically connected to the upper case 2, the main board 11 and the power source electrode plate are disposed in the upper case 2, and the main board and the power source electrode plate are protected by the sealed housing at a high level.
As shown in fig. 1, the power supply plate includes an upper electrode plate 5 and a lower electrode plate 8, the upper electrode plate 5 is fixed on the upper electrode base plate 4, the lower electrode plate 8 is fixed on the lower electrode base plate 7, and the upper electrode base plate 4, the lower electrode base plate 8 and the main board 11 are fixed above the base 1 through the insulating support column 6. The upper electrode polar plate 5 is connected with the lower electrode polar plate 8 through an upper electrode feed column 9, and the lower electrode polar plate 8 is connected with the main board 11 through a lower electrode feed column 10.
The upper electrode plate 5 and the lower electrode plate 8 are made of metal materials which are easy to conduct electricity, the upper electrode plate 5 and the lower electrode plate 8 are used for gathering charges in an electric field environment, when the direction of an electric field changes, the upper electrode plate 5 and the lower electrode plate 8 gather charges regularly along with the periodic change of the electric field, and accordingly correspondingly changed electric potential is formed between the upper electrode plate 5 and the lower electrode plate 8.
As shown in fig. 4, a main board circuit 12 is disposed on the main board 11, the main board circuit 12 includes a power circuit and a radio frequency circuit, the power circuit includes a rectifier circuit and a voltage regulator circuit connected to each other, after the electric potential generated between the upper electrode plate 5 and the lower electrode plate 8 is converted into direct current by the rectifier circuit, the alternating current is regulated by the voltage regulator circuit to obtain stable voltage output, and after the electric potential generated between the upper electrode plate 5 and the lower electrode plate 8 is rectified and regulated by the power circuit, the electric potential is used as a power source of the radio frequency circuit to supply power to the radio frequency circuit.
As shown in fig. 5, the rectifying circuit includes rectifying diodes D1, D2, D3, D4, the rectifying diodes D1, D3 are connected in series between the upper electrode plate 5 and the lower electrode plate 8, the rectifying diodes D2, D4 are connected in series and then connected in parallel to the rectifying diodes D1, D3, and the rectifying diodes D1, D2, D3, D4 convert the ac current into dc current.
As shown in fig. 6, the voltage stabilizing circuit includes a zener diode D5, one end of the zener diode D5 is connected between the rectifier diodes D1 and D3, and the other end is connected between the rectifier diodes D2 and D4, and the zener diode is used to stabilize the electric potential generated between the upper electrode plate 5 and the lower electrode plate 8, so as to avoid breaking down the radio frequency circuit.
Tuning capacitors C1 and C2 are respectively connected in series between the upper electrode plate and the rectifying diode and between the lower electrode plate and the rectifying diode, tuning capacitors C3 and C4 are connected in parallel to the voltage stabilizing diode D5, and the stability of the oscillating circuit is ensured by adding the tuning capacitors C1, C2, C3 and C4.
As shown in fig. 7, one end of the rf circuit is connected between the rectifier diodes D1 and D3, and the other end is connected between the rectifier diodes D2 and D4, and a stable dc voltage is supplied from the power supply circuit, and the rf circuit includes a parallel circuit formed by an upper damping resistor R1 and a lower damping resistor R2, and a three-point capacitor oscillator.
The capacitance three-point oscillator comprises a triode Q1, a base of the triode Q1 is connected with an inductor L2 and a secondary filter capacitor C8 in series, the inductor L2 and the secondary filter capacitor C8 are connected in series to form an LC resonance circuit, a frequency modulation signal is output from an inductor L2 tap through the secondary filter capacitor C8, the output frequency modulation signal is received by a radio frequency antenna and then is sent out, the output frequency modulation signal is received by a wireless receiving switchboard, and the switchboard analyzes the frequency modulation signal to obtain a detected temperature value.
A thermistor R3, a secondary filter capacitor C11 and a primary filter capacitor C7 are connected in series between a collector and an emitter of the triode Q1, an inductor L1 is connected in parallel to a series circuit consisting of a thermistor R3, a secondary filter capacitor C11 and a primary filter capacitor C7, the change of the ambient temperature is sensed through the thermistor R3, the thermistor R3 is connected in series with a parallel circuit formed by an upper damping resistor R1 and a lower damping resistor R2, the parallel circuit formed by the upper damping resistor R1 and the lower damping resistor R2 is connected between rectifier diodes D1 and D3, high-frequency noise and adjusting current are filtered through the parallel circuit formed by the upper damping resistor R1 and the lower damping resistor R2, the series circuit consisting of the thermistor R3, the secondary filter capacitor C11 and the primary filter capacitor C7 is connected in parallel to the inductor L1 and then connected between the rectifier diodes D2 and D4, and the thermistor R3 is connected in parallel to a resistor R4, a capacitor C9, a capacitor C6 and a resistor R6, the generation of high-frequency signals is suppressed, and the finally generated frequency modulation signals are lower than the tolerance value of a probe at a wireless receiving switchboard through a parallel circuit formed by an upper damping resistor R1 and a lower damping resistor R2 and a thermistor R3 which is sequentially connected with a resistor R4, a capacitor C9, a capacitor C6 and a resistor R6 in parallel, so that the squeaking of the probe is prevented, and the service life of the probe is prolonged.
The upper damping resistor R1 and the lower damping resistor R2 are 0 ohm magnetic beads and are used for filtering high frequency noise and adjusting current.
The voltage rectified and stabilized by the power supply circuit is filtered by the upper damping resistor R1 and the lower damping resistor R2 to remove high-frequency noise and adjust current, and then is loaded on the varactor diode VD of the triode Q1 by the thermistor R3, so that the PN junction capacitance of the VD changes. Since VD is connected in parallel to the LC tank, the change in the junction capacitance changes the parameters of the LC tank, so that the oscillation frequency changes with the amplitude of the modulation signal. The final frequency-modulated signal is transmitted via the rf antenna AT via the secondary filter capacitor C8 and the inductor L2.
The radio frequency circuit adopts a triode to form an oscillation source, and capacitors C11 and C8 and inductors L1 and L2 are used for forming a filter circuit. The circuit ensures the stability of the oscillating circuit by adding tuning capacitors C1, C2, C3 and C4.
And the power circuit is also provided with an indicator light, and the working state of the power circuit part is indicated through the indicator light.
In this embodiment, the transistor is a 9018 transistor.
For convenience of installation, as shown in fig. 3, a threaded blind hole 3 is provided on the bottom surface of the base 1, the threaded blind hole facilitates the fixed installation of the temperature sensor of the present embodiment, and the bottom surface of the base 1 is a surface located outside the housing.
Wherein, the base chooses the metal base for use, and the epitheca chooses the fat to seal the epitheca, and the fat seals the shell and seals mainboard, power polar plate, forms higher level protection to set up sound-permeable cloth in the fat seals the epitheca, so that radio frequency antenna can send audio signal.
When the micro passive wireless temperature sensor disclosed in this embodiment works, the upper power plate and the lower power plate periodically collect positive and negative charges under the action of the alternating electric field, and the periodic process is accompanied by the collection and dispersion flow of the charges. A certain voltage is generated between the upper electrode plate and the lower electrode plate in an electric field, current formed by flowing of charges forms direct current through a main board rectifying circuit, and after the direct current is stabilized by a voltage stabilizing circuit, a radio frequency circuit is driven to form a specific frequency modulation radio frequency signal which is emitted through a radio frequency antenna on a main board.
The temperature sensitive element in the radio frequency circuit is a thermistor R3, and the parameter of the temperature sensitive element has a specific relation curve with the temperature. When the temperature changes, the LC resonant circuit of the frequency modulation circuit changes along with the parameter change of the temperature sensitive element in the circuit. The varying temperature is transmitted by the varying frequency modulated signal.
The device can operate in an alternating electric field where the field strength reaches a certain strength. Because the mainboard is not provided with the control chip, all the control chip are analog circuits, and the power consumption is lower. When the device is in a strong alternating electric field, the periodic charge accumulation starts, and a current with driving capability is formed, so that the radio frequency circuit is driven to start working.
The power supply electricity taking mode of the radio frequency circuit described in the embodiment omits an external power supply connection line, the temperature measurement return adopts an analog frequency modulation mode, the power consumption is lower than that of a wireless return mode adopting wireless ICs (wireless fidelity), Bluetooth and the like, and the arranged grease-sealed shell has a better protection level and can adapt to installation and deployment in the field at the time of wiping sweat. And this embodiment can carry out real-time supervision to the temperature, and self-adaptation low temperature environment can be in outdoor high low temperature environment under stable work.
The resistance in this embodiment all adopts chip resistor, and the inductance adopts the paster inductance, has effectively reduced the volume of mainboard, makes passive wireless temperature sensor's whole volume less, possesses miniature characteristics, conveniently carries.
And the outer shell is additionally arranged outside the electric plate, the same-color sound-transmitting cloth is arranged on the outer shell, the radio frequency antenna cannot be seen from the outside, and the emission of frequency modulation signals is not hindered while the radio frequency antenna is disguised.
The resistor R4, the capacitor C9, the capacitor C6 and the resistor R6 are arranged on the thermistor R3, so that the high-frequency signal is restrained from being sent out, howling at the signal receiving probe is prevented, and the service life of the probe is prolonged.
According to the method and the device, on the basis of corresponding automatic increase of the power, the backup frequency combination can be switched, and the interference efficiency is further improved.
Example 2
In this embodiment, a micro passive wireless temperature measurement system is disclosed, including the micro passive wireless temperature sensor disclosed in embodiment 1.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A miniature passive wireless temperature sensor is characterized by comprising an upper power supply plate, a lower power supply plate and a main board, wherein a power circuit and a radio frequency circuit are arranged on the main board, the upper power supply plate and the lower power supply plate are connected with the power circuit through a feed column, the power circuit supplies power for the radio frequency circuit, the radio frequency circuit comprises a capacitance three-point oscillator, the capacitance three-point oscillator comprises a thermistor, and the resistance value of the thermistor changes along with the temperature change, so that the capacitance three-point oscillator sends a frequency modulation signal to realize temperature measurement.
2. The miniature passive wireless temperature sensor of claim 1, wherein the capacitive three-point oscillator comprises a triode, a base of the triode is connected with the LC resonant circuit, the frequency modulated signal is emitted through the LC resonant circuit, a thermistor and a filter capacitor are connected in series between a collector and an emitter of the triode, and an inductor is connected in parallel to a series circuit formed by the thermistor and the filter capacitor.
3. The miniature passive wireless temperature sensor of claim 2, wherein the thermistor is connected to a power circuit, and a voltage provided by the power circuit is applied to the transistor via the thermistor.
4. The miniature passive wireless temperature sensor of claim 2, wherein the thermistor is connected in parallel with a resistor R4, a capacitor C9, a capacitor C6 and a resistor R6 in sequence.
5. The miniature passive wireless temperature sensor of claim 2, wherein a parallel circuit formed by the upper and lower damping resistors is connected between the thermistor and the power circuit.
6. The miniature passive wireless temperature sensor of claim 1, wherein the motherboard comprises a radio frequency antenna, the radio frequency antenna receiving and transmitting a frequency modulated signal.
7. The miniature passive wireless temperature sensor of claim 1, wherein the power circuit comprises a rectifying circuit and a voltage stabilizing circuit, the rectifying circuit is connected to the upper power plate and the lower power plate through the feeding post, the voltage stabilizing circuit is connected to the rectifying circuit, and the rectifying circuit is connected to the capacitive three-point oscillator.
8. The miniature passive wireless temperature sensor of claim 1, wherein the upper electrode plate is connected to the upper electrode base plate, the lower electrode plate is connected to the lower electrode base plate, the upper electrode base plate, the lower electrode base plate and the motherboard are secured to the base by insulating support posts, the base is connected to the housing, and the upper electrode plate, the lower electrode plate and the motherboard are disposed within the housing.
9. The miniature passive wireless temperature sensor of claim 8, wherein a threaded blind hole is provided below the base.
10. A miniature passive wireless temperature measurement system, comprising a miniature passive wireless temperature sensor according to any of claims 1-9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113916395A (en) * | 2021-10-18 | 2022-01-11 | 国网江苏省电力有限公司镇江供电分公司 | Wireless temperature measuring device for live installation of transformer substation |
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| CN112729588B (en) | 2021-09-17 |
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