CN104390726A - Passive wireless temperature measuring device - Google Patents
Passive wireless temperature measuring device Download PDFInfo
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- CN104390726A CN104390726A CN201410626605.1A CN201410626605A CN104390726A CN 104390726 A CN104390726 A CN 104390726A CN 201410626605 A CN201410626605 A CN 201410626605A CN 104390726 A CN104390726 A CN 104390726A
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Abstract
The invention relates to a passive wireless temperature measuring device and belongs to the measuring instrument technical field. The objective of the invention is to improve anti-interference ability. The device comprises a passive acoustic wave surface temperature sensor, a main controller, an SAW filtering unit, a low-noise amplifier, a radio frequency transceiver module, a mixer and two voltage controlled oscillators, wherein the two voltage controlled oscillators are respectively a transmitting oscillator and a receiving oscillator. When temperature measurement is performed, at first, the transmitting oscillator and the radio frequency signal transceiver module are utilized to perform frequency sweep; the transmitting oscillator is switched off, and the receiving oscillator is switched on; the mixer is utilized to mix echo signals received by the radio frequency signal transceiver module and output signals of the receiving oscillator and thereafter transmitting the mixed signals to the main controller; and the main controller calculates the frequency of the echo signals and calculate the value of measured temperature. The device provided by the invention can be applied to multi-sensor bandwidth application conditions.
Description
Technical field
The present invention relates to surveying instrument technology, particularly relate to a kind of technology of passive wireless temperature measuring device.
Background technology
Passive sonic surface wave technology is used for existing more than 20 year of the parameter measurement researchs such as temperature, and its advantage is that sensor is made up of piezoelectric, without any semiconductor material, does not need powered battery, is applicable to the industrial environment that application is harsh, but in practical application, have no batch application case, only has pilot application among a small circle, the still own integrity problem of passive product of tracing it to its cause does not solve at all, because working sensor is in passive states, the energy collected by antenna generates mechanical wave excitation resonance through transducer, mechanical wave is converted to after electromagnetic wave through transducer and is gone out by aerial radiation, signal exponentially decay state arrive receiver time quite faint, add environment, the interference such as voltage, easy generation mistake is measured, this is that commercial Application such as intelligent grid application is not allowed, and the Transmit enable time of general rf chip is in millisecond rank, cannot be used for monitoring the sensor echo that only there are tens microseconds.
Summary of the invention
For the defect existed in above-mentioned prior art, technical matters to be solved by this invention is to provide the strong passive wireless temperature measuring device of a kind of antijamming capability.
In order to solve the problems of the technologies described above, a kind of passive wireless temperature measuring device provided by the present invention, comprise passive sonic surface wave temperature sensor, master controller, voltage controlled oscillator, SAW filter unit, low noise amplifier, and passive sonic surface wave temperature sensor can be encouraged also to receive the radio frequency signal transceiving module of passive sonic surface wave temperature sensor echoed signal, it is characterized in that: also comprise frequency mixer;
Described voltage controlled oscillator has two, and one of them voltage controlled oscillator is transmitter oscillator, and another voltage controlled oscillator is reception oscillator, and the oscillator signal output terminal of transmitter oscillator receives the oscillator signal input end of radio frequency signal transceiving module;
Described master controller has two echo signal reception ends and two voltage control signal output terminals, and two voltage control signal output terminals of master controller receive the voltage control signal input end of two voltage controlled oscillators respectively;
The oscillator signal output terminal of described reception oscillator receives a source signal input end of frequency mixer, and the echoed signal output terminal of radio frequency signal transceiving module receives another source signal input end of frequency mixer successively through SAW filter unit, low noise amplifier;
The mixed frequency signal output terminal of described frequency mixer is divided into two-way, and an echo signal reception end of master controller received by road one intermediate-frequency filter wherein, and another echo signal reception end of master controller is received through another intermediate-frequency filter in another road.
Further, described SAW filter unit is made up of multiple SAW filter, the working frequency range of each SAW filter is different each other, and the homogeneous input end terminating to low noise amplifier of each SAW filter, the other end receives the echoed signal output terminal of radio frequency signal transceiving module by a frequency error factor switch.
Passive wireless temperature measuring device provided by the invention, adopt bistatic circuit, radio-frequency transmissions and echo reception are separated, make emitted energy energy rapid decay, thus reduce the frequency interferences of launching receiving, higher backward energy can be won, can be used for monitoring the sensor echo that only there are tens microseconds, have the advantages that antijamming capability is strong, and SAW filter unit is made up of multiple SAW filter, effectively have compressed front end bandwidth, greatly reduce the chance that receiving unit is disturbed source impact, multisensor bandwidth applications condition can be adapted to.
Accompanying drawing explanation
Fig. 1 is the structural representation of the passive wireless temperature measuring device of the embodiment of the present invention.
Embodiment
Illustrate below in conjunction with accompanying drawing and be described in further detail embodiments of the invention, but the present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar change thereof, all should list protection scope of the present invention in.
As shown in Figure 1, a kind of passive wireless temperature measuring device that the embodiment of the present invention provides, comprise passive sonic surface wave temperature sensor B1, master controller U1, frequency mixer X1, SAW filter unit U3, low noise amplifier U4, and two voltage controlled oscillators V1, V2, passive sonic surface wave temperature sensor can be encouraged also to receive the radio frequency signal transceiving module U2 of passive sonic surface wave temperature sensor echoed signal;
In described two voltage controlled oscillators, one of them voltage controlled oscillator V1 is transmitter oscillator, and another voltage controlled oscillator V2 is reception oscillator, and the oscillator signal output terminal of transmitter oscillator V1 receives the oscillator signal input end of radio frequency signal transceiving module U2;
Described master controller U1 has two echo signal reception ends and two voltage control signal output terminals, and two voltage control signal output terminals of master controller U1 receive the voltage control signal input end of two voltage controlled oscillators V1, V2 respectively;
The oscillator signal output terminal of described reception oscillator V2 receives a source signal input end of frequency mixer X1, and the echoed signal output terminal of radio frequency signal transceiving module U2 receives another source signal input end of frequency mixer X1 successively through SAW filter unit U3, low noise amplifier U4;
The mixed frequency signal output terminal of described frequency mixer X1 is divided into two-way, a road one intermediate-frequency filter A1 wherein receives an echo signal reception end of master controller U1, and another echo signal reception end of master controller U1 is received through another intermediate-frequency filter A2 in another road.
In the embodiment of the present invention, described SAW filter unit U3 is made up of multiple SAW filter, the working frequency range of each SAW filter is different each other, the homogeneous input end terminating to low noise amplifier U4 of each SAW filter, the other end receives the echoed signal output terminal of radio frequency signal transceiving module U2 by a frequency error factor switch, and each frequency error factor switch forms all and changes switch arrays.
In the embodiment of the present invention, what described master controller adopted is single-chip microcomputer.
The temp measuring method of the passive wireless temperature measuring device of the embodiment of the present invention, is characterized in that, concrete steps are as follows:
1) utilize master controller U1 to control transmitter oscillator V1 outputting oscillation signal, make radio frequency signal transceiving module U2 emitting radio frequency signal, thus excitation passive sonic surface wave temperature sensor B1;
2) utilize master controller U1 to control transmitter oscillator V1 and stop outputting oscillation signal, and control reception oscillator V2 outputting oscillation signal;
Now, radio frequency signal transceiving module U2 receives the echoed signal of passive sonic surface wave temperature sensor B1, its echoed signal received is successively by entering frequency mixer X1 after SAW filter unit U3, low noise amplifier U4, after the oscillator signal mixing exported with reception oscillator V2, two-way is divided to enter master controller U1 through intermediate-frequency filter A1, A2;
3) master controller U1 is according to the two-way echoed signal received, and calculates the echo frequency of passive sonic surface wave temperature sensor B1, then the echo frequency calculated is scaled temperature value;
The method calculating echo frequency according to echoed signal and method echo frequency being scaled temperature value are prior art.
The embodiment of the present invention is applicable to the passive sonic surface wave temperature sensor of various bandwidth, utilize change-over switch array to be switched to duty by the corresponding SAW filter that passive sonic surface wave temperature sensor mates when receiving echoed signal, the filtering to echoed signal can be realized.
Claims (2)
1. a passive wireless temperature measuring device, comprise passive sonic surface wave temperature sensor, master controller, voltage controlled oscillator, SAW filter unit, low noise amplifier, and passive sonic surface wave temperature sensor can be encouraged also to receive the radio frequency signal transceiving module of passive sonic surface wave temperature sensor echoed signal, it is characterized in that: also comprise frequency mixer;
Described voltage controlled oscillator has two, and one of them voltage controlled oscillator is transmitter oscillator, and another voltage controlled oscillator is reception oscillator, and the oscillator signal output terminal of transmitter oscillator receives the oscillator signal input end of radio frequency signal transceiving module;
Described master controller has two echo signal reception ends and two voltage control signal output terminals, and two voltage control signal output terminals of master controller receive the voltage control signal input end of two voltage controlled oscillators respectively;
The oscillator signal output terminal of described reception oscillator receives a source signal input end of frequency mixer, and the echoed signal output terminal of radio frequency signal transceiving module receives another source signal input end of frequency mixer successively through SAW filter unit, low noise amplifier;
The mixed frequency signal output terminal of described frequency mixer is divided into two-way, and an echo signal reception end of master controller received by road one intermediate-frequency filter wherein, and another echo signal reception end of master controller is received through another intermediate-frequency filter in another road.
2. passive wireless temperature measuring device according to claim 1, it is characterized in that: described SAW filter unit is made up of multiple SAW filter, the working frequency range of each SAW filter is different each other, the homogeneous input end terminating to low noise amplifier of each SAW filter, the other end receives the echoed signal output terminal of radio frequency signal transceiving module by a frequency error factor switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410626605.1A CN104390726A (en) | 2014-11-10 | 2014-11-10 | Passive wireless temperature measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410626605.1A CN104390726A (en) | 2014-11-10 | 2014-11-10 | Passive wireless temperature measuring device |
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| CN104390726A true CN104390726A (en) | 2015-03-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105337632A (en) * | 2015-11-20 | 2016-02-17 | 福州大学 | Distributed strain sensor system based on pulse stretching treatment technology |
| CN108088582A (en) * | 2017-12-29 | 2018-05-29 | 广东电网有限责任公司东莞供电局 | Method for quickly measuring temperature of switch cabinet by using surface acoustic waves |
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| CN101661662A (en) * | 2009-08-03 | 2010-03-03 | 深圳市保利天同通讯设备有限公司 | Locating lifesaving terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105337632A (en) * | 2015-11-20 | 2016-02-17 | 福州大学 | Distributed strain sensor system based on pulse stretching treatment technology |
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