CN103279777A - Wireless surface acoustic wave temperature measurement system reader-writer - Google Patents
Wireless surface acoustic wave temperature measurement system reader-writer Download PDFInfo
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- CN103279777A CN103279777A CN2013101624116A CN201310162411A CN103279777A CN 103279777 A CN103279777 A CN 103279777A CN 2013101624116 A CN2013101624116 A CN 2013101624116A CN 201310162411 A CN201310162411 A CN 201310162411A CN 103279777 A CN103279777 A CN 103279777A
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Abstract
The invention discloses a wireless surface acoustic wave temperature measurement system reader-writer, which consists of a signal generating unit 101, an amplifier unit 102, a band-pass filter 103, a radio frequency switch 104, a crystal oscillator 105, a local oscillator 106, a band-pass filter 107, a low noise amplifier 108, a filter 109, an intermediate frequency amplifier 110, an analog-digital conversion module 111 and a digital signal processing module 112. The reader-writer has a double phase-locked loop structure, ensures that the expected frequency can be achieved during transmission and receiving, and provides guarantee for accurately measuring temperature.
Description
Technical field
The invention belongs to the cross-application of wireless radio-frequency and surface acoustic wave techniques, relate in particular to a kind of wireless acoustic surface wave temperature measurement circuit, based on the acoustic surface wave radio frequency identification read write line of DSP technology.
Background technology
Surface acoustic wave (SAW) is the mechanical wave of propagating in the piezoelectric crystal surface, its velocity of sound only be 100,000 of velocity of electromagnetic waves/, it is very little to propagate attenuation.By interdigital transfer device, the electric signal dress is changed to acoustical signal, and be confined to substrate surface and propagate, it is utilized at pressure, has very high accuracy in the isoparametric measurement of temperature, be a kind of mode of resonance SAW temperature sensor Auto-Test System of CN202305058U as publication number, this test macro bulky complex, and can't test a plurality of sensors simultaneously, though have mode of resonance propagation distance characteristics far away, but the essence of this system is the probe temperature sensor, be not the thermometric reader, the correlation technique of also still not having wireless acoustic surface wave thermometric reader at present is open; And for example publication number is a kind of improved ultrahigh frequency RFID reader of CN102622571A, though this reader has operating distance far away, it adopts coded system just to be used for identifying information, and can't accomplish to measure the function of temperature.We are desirable to provide a kind of wireless acoustic surface wave temp measuring system read write line that can accurately measure a plurality of sensors simultaneously for this reason.
Summary of the invention
In view of the above shortcoming of prior art, the purpose of this invention is to provide wireless acoustic surface wave temp measuring system read write line, make it when measuring a plurality of sensor, to need not a plurality of read write lines, and improve the accuracy of temperature detection.
The objective of the invention is to realize by following means:
A kind of wireless acoustic surface wave temp measuring system read write line, it is characterized in that, constituted by signal generation unit 101, amplifying unit 102, bandpass filter 103, radio-frequency (RF) switch 104, crystal oscillator 105, local oscillator 106, bandpass filter 107, low noise amplifier 108, wave filter 109, intermediate frequency amplifier 110, analog-to-digital conversion module 111, digital signal processing module 112; Wherein crystal oscillator 105 produces the most original reference frequency, simultaneously frequency is delivered to signal generation unit 101 and local oscillator 106, pass through amplifying unit 102 and bandpass filter 103 again through the frequency that the signal generation unit is handled, by radio-frequency (RF) switch 104 emission interrogation signals; The response signal that radio-frequency (RF) switch 104 receiving front-end sensors are passed back, response signal is delivered to bandpass filter 107, amplify through prime amplifier 108 again, carry out Frequency mixing processing with the frequency that local oscillator 106 is before sent here, signal after the mixing is passed through intermediate frequency amplifier 110, again signal is delivered to analog-to-digital conversion module 111 and digital signal processing module 112 is handled, obtain temperature value.
Adopt equipment of the present invention, crystal oscillator 105 produces the most original reference frequency, simultaneously frequency is delivered to signal generation unit 101 and local oscillator 106, passed through amplifying unit 102 and bandpass filter 103 again through the frequency that the signal generation unit is handled, by radio-frequency (RF) switch 104 emission interrogation signals; The response signal that radio-frequency (RF) switch 104 receiving front-end sensors are passed back, response signal is delivered to bandpass filter 107, amplify through prime amplifier 108 again, carry out Frequency mixing processing with the frequency that local oscillator 106 is before sent here, signal after the mixing is passed through intermediate frequency amplifier 110, again signal is delivered to analog-to-digital conversion module 111 and digital signal processing module 112 is handled, obtain temperature value.
The radio-frequency (RF) switch chip connects the receipts module simultaneously and a module constitutes independently sending and receiving gating; The radio-frequency (RF) switch chip connects the multichannel antenna expanded circuit simultaneously with the linearity of holding signal; The low noise amplifier that pre-amplifying module adopts connects the bandpass filter in the radio-frequency switch module; Signal after low noise amplifier output is amplified enters intermediate frequency amplifier; By intermediate frequency amplifier information being sent to DSP handles; At sending module, will be connected to radio-frequency (RF) switch after reference frequency amplification, the filtering; Simultaneously reference frequency is also by local oscillator, and receives the signal mixing, guaranteed accuracy; Radio-frequency (RF) switch connects a plurality of antenna terminals, and each antenna can articulate a plurality of sensors, measures multi-point temp simultaneously.
Principle of work of the present invention:
At first, local oscillator produces by two phaselocked loops, the degree of stability height, and the benchmark as emission interrogation signals and detection response signal plays an important role in entire circuit.
Secondly, at transmitter module, crystal oscillator 105 produces the most original reference signal, 101 interceptings need through the signal generation unit pulse width, up-conversion after amplification, filtering, obtain pulse again, through integrated amplifier, launched by antenna again, form interrogation signals.
Then, at receiver module, radio-frequency (RF) switch is got to the wait accepting state, select time 1.2-2us, after response signal arrives receiver module, at first advanced bandpass filter 107 and carry out the filtering processing, after filtering was handled, signal amplified by radio frequency amplifier 108, it is low noise amplifier, through rf filtering with after amplifying, signal and local oscillator 106 are carried out down coversion; After the down coversion, signal enters intermediate-frequency filter 109 and carries out intermediate frequency filtering, amplifies through intermediate frequency amplifier 110 intermediate frequencies again.Signal behind the amplification H is delivered to DSP again and is calculated after analog to digital conversion, calculate temperature value t by formula (1).
t=(f
r-f
s)／S
k+t
0 (1)
T wherein
0Be reference temperature value, f
rBe the response frequency value that frequency deviation is arranged that receives, f
sBe the frequency of seeking signal that sends out, S
kBe SAW sensor frequency deviation temperature characterisitic (according to different sensors characteristic difference, for example having 7K=1 ℃).
Radio-frequency (RF) switch belongs to single-pole double-throw (SPDT) (SPDT), and select time 1.2-2us, high level select to send, low level selective reception signal, keep the linearity, and the isolation that sends and receive between the chain is provided, and realizes minimum Insertion Loss simultaneously as far as possible.
Before mixing, by phase-locked loop structures as shown in Figure 2, obtain stable and desirable mixing frequency, what enter phaselocked loop is a stable and reference source identical with transmitting terminal, pass through frequency divider and voltage controlled oscillator again, obtain expecting stable mixing frequency and the signal mixing of receiving.
Adopt above-mentioned technology, obvious effects of the present invention is:
Adopt many antennas multisensor pattern, the external a plurality of sensors of each antenna terminal, each sensor resonant frequency is all different, has guaranteed to measure simultaneously the temperature of a plurality of positions.
Adopt rectangle rect.p. intermittently to do the signal excitation, keep the linearity, and the isolation that sends and receive between the chain is provided, realize minimum Insertion Loss simultaneously as far as possible.
Adopt the two phase-locked loop structure, guaranteed the stability of signal, keep the frequency tight type of transceiver module simultaneously, for the frequency content of isolating variation provides stable guarantee.
Adopt many antenna channels, by radio-frequency (RF) switch selection work main channel, and guarantee that whole reader works in time division multiplexing.
Description of drawings
Fig. 1 is the realization block diagram of wireless acoustic surface wave temp measuring system read write line of the present invention
Fig. 2 is the phase-locked loop structures of wireless acoustic surface wave temp measuring system read write line of the present invention
Fig. 3 is the course of work signal of Fig. 1
Fig. 4 is the course of work synoptic diagram of Fig. 2
Fig. 5 is the radio-frequency switch module connection layout of wireless acoustic surface wave temp measuring system read write line of the present invention.
Embodiment
The specific embodiment of the present invention: a kind of wireless acoustic surface wave temp measuring system read write line, described read write line comprise transmission signal generation unit, send signal amplification unit, send signal bandpass filter, radio-frequency (RF) switch, local oscillator, reception signal bandpass filter, low noise amplifier, wave filter, intermediate frequency amplifier, analog-to-digital conversion module, digital signal processing module and a plurality of antenna terminal.The invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, the present invention program is by sending signal generation unit 101, send signal amplification unit 102, sending signal bandpass filter 103, radio-frequency (RF) switch 104(select time 1.2-2us), crystal oscillator 105, local oscillator 106, receive signal bandpass filter 107, low noise amplifier 108, wave filter 109, intermediate frequency amplifier 110, analog-to-digital conversion module 111, digital signal processing module 112 and constitute.Wherein crystal oscillator 105 produces the most original reference frequency, simultaneously frequency is delivered to and sent signal generation unit 101 and local oscillator 106, process sends the frequency of signal generation unit processing again through sending signal amplification unit 102 and sending signal bandpass filter 103, launches interrogation signals by radio-frequency (RF) switch 104; The response signal that radio-frequency (RF) switch 104 receiving front-end sensors are passed back, response signal is delivered to reception signal bandpass filter 107, amplify through prime amplifier 108 again, carry out Frequency mixing processing with the frequency that local oscillator 106 is before sent here, signal after the mixing is passed through intermediate frequency amplifier 110, again signal is delivered to analog-to-digital conversion module 111 and digital signal processing module 112 is handled, obtain temperature value.Account form as shown in Equation 1.
Fig. 2 is for sending the composition frame chart of signal generation unit 101 among the present invention.Crystal oscillator 105 produces the most original reference frequency.Reference frequency signal sends to reference frequency frequency divider 1015 signal is delivered to phase detector 1014, via passing through loop filter 1011 behind the phase detector, again by behind the voltage controlled oscillator 1012, enters feedback frequency frequency divider 1013 and forms the PLL phase-locked loops.The signal that produces is given and is sent signal amplification unit 102.
Fig. 5 is the radio-frequency switch module of wireless acoustic surface wave temp measuring system read write line of the present invention, radio-frequency (RF) switch 104 a plurality of downstreams in parallel radio-frequency (RF) switch receive different response signal antenna terminals, for ease of carrying out the selection of reader signal transmit-receive position, radio-frequency (RF) switch 104 adopts the two-way gauge tap, selects different paths when accepting with emission for use; Downstream radio-frequency (RF) switch (1042,1043,1044) selects for use one-way switch, each antenna terminal to articulate all different front end sensors of a plurality of sensing resonance frequencies.Each carries an antenna downstream radio-frequency (RF) switch, and each antenna articulates different sensors, realizes that multiple spot detects.Sensor is individualism, and different sensors has different resonance frequencies, therefore requires reader to send the detectable signal of different frequency at same antenna.The downstream radio-frequency (RF) switch is carried out the selection of transmitting antenna, can only have one to be in open mode at synchronization in them.Reader can only carry out transmission or the reception of signal from some antennas at synchronization.
Claims (2)
1. wireless acoustic surface wave temp measuring system read write line, it is characterized in that, constituted by signal generation unit 101, amplifying unit 102, bandpass filter 103, radio-frequency (RF) switch 104, crystal oscillator 105, local oscillator 106, bandpass filter 107, low noise amplifier 108, wave filter 109, intermediate frequency amplifier 110, analog-to-digital conversion module 111, digital signal processing module 112; Wherein crystal oscillator 105 produces the most original reference frequency, simultaneously frequency is delivered to signal generation unit 101 and local oscillator 106, pass through amplifying unit 102 and bandpass filter 103 again through the frequency that the signal generation unit is handled, by radio-frequency (RF) switch 104 emission interrogation signals; The response signal that radio-frequency (RF) switch 104 receiving front-end sensors are passed back, response signal is delivered to bandpass filter 107, amplify through prime amplifier 108 again, carry out Frequency mixing processing with the frequency that local oscillator 106 is before sent here, signal after the mixing is passed through intermediate frequency amplifier 110, again signal is delivered to analog-to-digital conversion module 111 and digital signal processing module 112 is handled, obtain temperature value.
2. the surface acoustic wave temp measuring system read write line according to claim 1, it is characterized in that, it is characterized in that described radio-frequency (RF) switch 104 a plurality of downstreams in parallel radio-frequency (RF) switch receive different response signal antenna terminals, each antenna articulates all different front end sensors of a plurality of sensing resonance frequencies.
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| CN104390726A (en) * | 2014-11-10 | 2015-03-04 | 上海鸿晔电子科技有限公司 | Passive wireless temperature measuring device |
| CN104485894A (en) * | 2014-11-12 | 2015-04-01 | 广州中大微电子有限公司 | Common-mode level shift treatment circuit and method for operational amplifier |
| CN105043584A (en) * | 2015-07-10 | 2015-11-11 | 北京中讯四方科技股份有限公司 | Wireless temperature measurement system |
| CN105092081A (en) * | 2015-08-14 | 2015-11-25 | 深圳华远微电科技有限公司 | Anti-interference temperature signal receiver and signal processing method |
| CN105167757A (en) * | 2015-10-12 | 2015-12-23 | 无锡华普微电子有限公司 | Cattle and sheep body temperature monitoring system based on surface acoustic waves and RFID technology |
| CN105571743A (en) * | 2016-02-24 | 2016-05-11 | 南京科睿博电气科技有限公司 | Surface acoustic wave technology-based switch cabinet temperature measurement interference shielding apparatus |
| CN106339646A (en) * | 2016-08-26 | 2017-01-18 | 无锡卓信信息科技股份有限公司 | Non-contact RFID reader and writer |
| CN106410368A (en) * | 2016-11-16 | 2017-02-15 | 中科微声（天津）传感技术有限公司 | Multifunctional antenna |
| EP3171291A1 (en) * | 2015-11-20 | 2017-05-24 | pro.micron GmbH & Co.KG | Method and inquiring device for requesting data from a passive element |
| CN107078534A (en) * | 2014-10-20 | 2017-08-18 | 高通股份有限公司 | distributed power receiving element for wireless power transfer |
| CN108344800A (en) * | 2018-01-17 | 2018-07-31 | 浙江大学 | System for detecting temperature based on wireless passive sonic surface wave sensor and receive-transmit system |
| CN110736557A (en) * | 2019-10-24 | 2020-01-31 | 深圳市三和电力科技有限公司 | data collector for passive wireless temperature transmission measuring system |
| CN111289137A (en) * | 2020-02-14 | 2020-06-16 | 固开(上海)电气有限公司 | Wireless passive temperature measuring device and working method thereof |
| CN112468165A (en) * | 2020-11-25 | 2021-03-09 | 青岛理工大学 | Wireless passive high-voltage power grid temperature measurement system and method |
| CN113916392A (en) * | 2021-10-11 | 2022-01-11 | 国网湖南省电力有限公司 | Hydropower station generator rotor winding temperature on-line monitoring system and method |
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| JP2017536072A (en) * | 2014-10-20 | 2017-11-30 | クアルコム，インコーポレイテッド | Distributed power receiver for wireless power transfer |
| CN107078534B (en) * | 2014-10-20 | 2020-08-04 | 高通股份有限公司 | Distributed power receiving element for wireless power transfer |
| CN107078534A (en) * | 2014-10-20 | 2017-08-18 | 高通股份有限公司 | distributed power receiving element for wireless power transfer |
| CN104390726A (en) * | 2014-11-10 | 2015-03-04 | 上海鸿晔电子科技有限公司 | Passive wireless temperature measuring device |
| CN104485894A (en) * | 2014-11-12 | 2015-04-01 | 广州中大微电子有限公司 | Common-mode level shift treatment circuit and method for operational amplifier |
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| CN105092081A (en) * | 2015-08-14 | 2015-11-25 | 深圳华远微电科技有限公司 | Anti-interference temperature signal receiver and signal processing method |
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| CN105167757A (en) * | 2015-10-12 | 2015-12-23 | 无锡华普微电子有限公司 | Cattle and sheep body temperature monitoring system based on surface acoustic waves and RFID technology |
| EP3171291A1 (en) * | 2015-11-20 | 2017-05-24 | pro.micron GmbH & Co.KG | Method and inquiring device for requesting data from a passive element |
| CN105571743A (en) * | 2016-02-24 | 2016-05-11 | 南京科睿博电气科技有限公司 | Surface acoustic wave technology-based switch cabinet temperature measurement interference shielding apparatus |
| CN106339646A (en) * | 2016-08-26 | 2017-01-18 | 无锡卓信信息科技股份有限公司 | Non-contact RFID reader and writer |
| CN106410368A (en) * | 2016-11-16 | 2017-02-15 | 中科微声（天津）传感技术有限公司 | Multifunctional antenna |
| CN106410368B (en) * | 2016-11-16 | 2023-09-22 | 苏州光声纳米科技有限公司 | Multifunctional antenna |
| CN108344800A (en) * | 2018-01-17 | 2018-07-31 | 浙江大学 | System for detecting temperature based on wireless passive sonic surface wave sensor and receive-transmit system |
| CN110736557A (en) * | 2019-10-24 | 2020-01-31 | 深圳市三和电力科技有限公司 | data collector for passive wireless temperature transmission measuring system |
| CN111289137A (en) * | 2020-02-14 | 2020-06-16 | 固开(上海)电气有限公司 | Wireless passive temperature measuring device and working method thereof |
| CN112468165A (en) * | 2020-11-25 | 2021-03-09 | 青岛理工大学 | Wireless passive high-voltage power grid temperature measurement system and method |
| CN112468165B (en) * | 2020-11-25 | 2022-05-03 | 青岛理工大学 | Wireless passive high-voltage power grid temperature measurement system and method |
| CN113916392A (en) * | 2021-10-11 | 2022-01-11 | 国网湖南省电力有限公司 | Hydropower station generator rotor winding temperature on-line monitoring system and method |
| CN113916392B (en) * | 2021-10-11 | 2023-11-10 | 国网湖南省电力有限公司 | On-line monitoring system and method for temperature of rotor winding of hydropower station generator |
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Application publication date: 20130904 |