CN203327020U - Signal detecting circuit of resonance-type surface acoustic wave wireless sensor - Google Patents
Signal detecting circuit of resonance-type surface acoustic wave wireless sensor Download PDFInfo
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- CN203327020U CN203327020U CN2013203443407U CN201320344340U CN203327020U CN 203327020 U CN203327020 U CN 203327020U CN 2013203443407 U CN2013203443407 U CN 2013203443407U CN 201320344340 U CN201320344340 U CN 201320344340U CN 203327020 U CN203327020 U CN 203327020U
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Abstract
The utility model relates to a signal detecting circuit of a resonance-type surface acoustic wave wireless sensor. The signal detecting circuit includes a transmitting circuit, a receiving circuit and a digital signal processing circuit. Elements of the digital processing circuit include an analog-digital converter and a digital processor. Elements of the receiving circuit include a radio frequency switch, a low-noise amplifier, a frequency converter, an intermediate-frequency filter and a power detector. After the frequency converter converts wireless sensor signals to intermediate-frequency signals, the intermediate-frequency signals are divided into two channels and are supplied to the digital processor. One channel of the intermediate-frequency signals are intermediate-frequency time-domain signals while the other channel of the intermediate-frequency signals are power detection signals. The digital processor combines the power detection signals with the intermediate-frequency time-domain signals for sensor signal detection. The signal detection circuit has advantages of being simple in structure, good in signal detection stability and low in cost.
Description
Technical field
The utility model relates to sensor field, relates in particular to the signal deteching circuit of resonator type surface acoustic wave wireless senser.
Background technology
The resonator type surface acoustic wave transducer can be used for the detection of the physical quantitys such as temperature, pressure, gas, humidity.This transducer can wirelessly read and be fully passive, especially is applicable to severe environment applications, is the study hotspot of sensor field in recent years.Detection to its signal adopts the mode that generally all adopts the inquiry of pulsed frequency sweep, namely at transducer, in possible working band, send a series of swept-frequency signals, when the frequency of the natural resonance frequency of transducer and swept-frequency signal approaches, will produce resonance, send response signal.The frequency that detects response signal has also just been obtained the value of measurand.But in actual applications because its signal duration is short, signal quality is subject to distance and environmental impact is large, thus transducing signal fast, high accuracy and reliable Detection become difficult point.
In the prior art, the signal deteching circuit of resonator type surface acoustic wave wireless senser comprises emission, reception and Digital Signal Processing three parts.Wherein radiating circuit, for to transducer, providing energy, is comprised of frequency synthesizer, power amplifier and switch; Digital signal processing circuit is comprised of analog to digital converter and microprocessor; Receiving circuit is comprised of switch, radio-frequency filter, low noise amplifier, low-converter, intermediate frequency amplifier, controllable gain amplifier, power detector etc.But the complex structure of this kind of signal deteching circuit, the speed of input, precision and poor reliability, and cost is high.
The utility model content
The purpose of this utility model is, the problems referred to above that exist for the signal deteching circuit that overcomes surface acoustic wave wireless transducer of the prior art, a kind of signal deteching circuit of resonator type surface acoustic wave wireless senser is provided, and that this signal deteching circuit has advantages of is simple in structure, input good stability, cost are low.
For achieving the above object, the utility model provides a kind of signal deteching circuit of resonator type surface acoustic wave wireless senser, this signal deteching circuit comprises radiating circuit, receiving circuit and digital signal processing circuit, and the element of described digital signal processing circuit comprises analog to digital converter and digital processing unit; The element of described receiving circuit comprises: radio-frequency (RF) switch, low noise amplifier, frequency converter, intermediate-frequency filter; Described receiving circuit enters described low noise amplifier by the wireless sensing signal received through described radio-frequency (RF) switch and is amplified, and after described frequency converter is downconverted into intermediate-freuqncy signal by described wireless sensing signal, this intermediate-freuqncy signal is through intermediate-frequency filter filtering; The element of described receiving circuit also comprises: power detector; Described intermediate-freuqncy signal is divided into two paths of signals and supplies with described digital processing unit, and a road signal is the intermediate frequency time-domain signal, and another road signal is the power detection signal, and this power detection signal is generated by described power detector conversion by described intermediate-freuqncy signal; After described intermediate frequency time-domain signal and power detection signal are changed by analog to digital converter, described digital processing unit carries out the transducing signal detection in conjunction with this power detection signal and intermediate frequency time-domain signal.
As further improvement in the technical proposal, described frequency converter is downconverted into by described wireless sensing signal the intermediate-freuqncy signal that frequency is 10.7MHz; Described intermediate-frequency filter is the logical ceramic filter of band that centre frequency is 10.7MHz.
As further improvement in the technical proposal, the element of described receiving circuit also comprises: limiting amplifier; Described intermediate-freuqncy signal is amplified processing by described limiting amplifier to filtered this intermediate-freuqncy signal.
The advantage of the signal deteching circuit of a kind of resonator type surface acoustic wave wireless senser of the present utility model is:
Utilize described limiting amplifier to amplify processing to filtered intermediate-freuqncy signal, guaranteed that intermediate-freuqncy signal has stable amplitude; Described digital processing unit carries out the transducing signal detection in conjunction with described power detection signal and intermediate frequency time-domain signal, improves detection speed and the accuracy of detection of transducing signal.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of the signal deteching circuit of a kind of resonator type surface acoustic wave wireless senser of the present utility model.
Reference numeral
1, antenna 2, radio-frequency (RF) switch 3, low noise amplifier
4, frequency converter 5, the logical ceramic filter 6 of band, limiting amplifier
7, analog to digital converter 8, digital processing unit 9, power amplifier
10, intermediate frequency time-domain signal 11, power detector 12, power detection signal
Embodiment
Hereinafter in connection with the drawings and specific embodiments, the utility model is further described.
As shown in Figure 1, a kind of signal deteching circuit of resonator type surface acoustic wave wireless senser, this signal deteching circuit comprises radiating circuit, receiving circuit and digital signal processing circuit, and the element of described digital signal processing circuit comprises analog to digital converter 7 and digital processing unit 8; The element of described receiving circuit comprises: radio-frequency (RF) switch 2, low noise amplifier 3, frequency converter 4, intermediate-frequency filter; Described receiving circuit enters described low noise amplifier 3 by the wireless sensing signal received through described radio-frequency (RF) switch 2 and is amplified, and after described frequency converter 4 is downconverted into intermediate-freuqncy signal by described wireless sensing signal, this intermediate-freuqncy signal is through intermediate-frequency filter filtering; The element of described receiving circuit also comprises: power detector 11; Described intermediate-freuqncy signal is divided into two paths of signals, and to supply with described digital processing unit 8, one road signals are intermediate frequency time-domain signals 10, and another road signal is power detection signal 12, and this power detection signal 12 is generated by described power detector 11 conversions by described intermediate-freuqncy signal; After described intermediate frequency time-domain signal 10 and power detection signal 12 are changed by analog to digital converter 7, described digital processing unit 8 carries out the transducing signal detection in conjunction with this power detection signal 12 and intermediate frequency time-domain signal 10.
Based on above-described embodiment, described frequency converter 4 can be downconverted into the intermediate-freuqncy signal that frequency is 10.7MHz by described wireless sensing signal; Described intermediate-frequency filter is preferably the logical ceramic filter 5 of band that centre frequency is 10.7MHz; The element of described receiving circuit also comprises: limiting amplifier 6; Described intermediate-freuqncy signal is amplified processing by 6 pairs of filtered these intermediate-freuqncy signals of described limiting amplifier.
Fig. 1 also shows wherein a kind of structure of described radiating circuit, and under emission state, digital processing unit is after the frequency of setting oscillation source, and transmitting of generation amplified and processed and radio-frequency (RF) switch 2 transmission through power amplifier 9, finally by antenna 1, launched.
It should be noted that, above embodiment is only unrestricted in order to the technical solution of the utility model to be described.It will be understood by those of skill in the art that any modification to technical solutions of the utility model or be equal to substitute not break away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in claim scope of the present utility model.
Claims (3)
1. the signal deteching circuit of a resonator type surface acoustic wave wireless senser, this signal deteching circuit comprises radiating circuit, receiving circuit and digital signal processing circuit, and the element of described digital signal processing circuit comprises analog to digital converter (7) and digital processing unit (8); The element of described receiving circuit comprises: radio-frequency (RF) switch (2), low noise amplifier (3), frequency converter (4), intermediate-frequency filter; Described receiving circuit enters described low noise amplifier (3) by the wireless sensing signal received through described radio-frequency (RF) switch (2) and is amplified, after described frequency converter (4) is downconverted into intermediate-freuqncy signal by described wireless sensing signal, this intermediate-freuqncy signal is through intermediate-frequency filter filtering; It is characterized in that, the element of described receiving circuit also comprises: power detector (11); Described intermediate-freuqncy signal is divided into two paths of signals and supplies with described digital processing unit (8), one road signal is intermediate frequency time-domain signal (10), another road signal is power detection signal (12), and this power detection signal (12) is generated by described power detector (11) conversion by described intermediate-freuqncy signal; After described intermediate frequency time-domain signal (10) and power detection signal (12) are changed by analog to digital converter (7), described digital processing unit (8) carries out the transducing signal detection in conjunction with this power detection signal (12) and intermediate frequency time-domain signal (10).
2. the signal deteching circuit of resonator type surface acoustic wave wireless senser according to claim 1, is characterized in that, described frequency converter (4) is downconverted into by described wireless sensing signal the intermediate-freuqncy signal that frequency is 10.7MHz; Described intermediate-frequency filter is the logical ceramic filter (5) of band that centre frequency is 10.7MHz.
3. the signal deteching circuit of resonator type surface acoustic wave wireless senser according to claim 1, is characterized in that, the element of described receiving circuit also comprises: limiting amplifier (6); Described intermediate-freuqncy signal is amplified processing by described limiting amplifier (6) to filtered this intermediate-freuqncy signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203443407U CN203327020U (en) | 2012-11-28 | 2013-06-17 | Signal detecting circuit of resonance-type surface acoustic wave wireless sensor |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220636899 | 2012-11-28 | ||
| CN201220636899.2 | 2012-11-28 | ||
| CN2013203443407U CN203327020U (en) | 2012-11-28 | 2013-06-17 | Signal detecting circuit of resonance-type surface acoustic wave wireless sensor |
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| Publication Number | Publication Date |
|---|---|
| CN203327020U true CN203327020U (en) | 2013-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013203443407U Expired - Fee Related CN203327020U (en) | 2012-11-28 | 2013-06-17 | Signal detecting circuit of resonance-type surface acoustic wave wireless sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990625A (en) * | 2015-06-18 | 2015-10-21 | 电子科技大学 | Wireless test circuit of resonant type surface acoustic wave sensor and test method |
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2013
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990625A (en) * | 2015-06-18 | 2015-10-21 | 电子科技大学 | Wireless test circuit of resonant type surface acoustic wave sensor and test method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JIANGSU SALISENSE TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: LI HAIFENG Effective date: 20140707 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 100056 FENGTAI, BEIJING TO: 226019 NANTONG, JIANGSU PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20140707 Address after: Jiangsu province Nantong City Road 226019, No. 58 Nantong science and Technology Park 3 Building 8 layer Patentee after: Salisense Technology Co., Ltd. Address before: 100056, room 1614, fortune West mansion, No. 58 vegetable house, Fengtai District, Beijing Patentee before: Li Haifeng |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131204 Termination date: 20210617 |