CN105222919A - A kind of passive wireless temperature sensor based on surface acoustic wave - Google Patents
A kind of passive wireless temperature sensor based on surface acoustic wave Download PDFInfo
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- CN105222919A CN105222919A CN201510706401.3A CN201510706401A CN105222919A CN 105222919 A CN105222919 A CN 105222919A CN 201510706401 A CN201510706401 A CN 201510706401A CN 105222919 A CN105222919 A CN 105222919A
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Abstract
The invention discloses a kind of passive wireless temperature sensor based on surface acoustic wave, electromagnetic wave and surface acoustic wave can be changed by saw sensor mutually, realize electromechanical energy to exchange, the electromagnetic energy of antenna is directly efficiently converted to acoustic energy and carries out biography receipts by surface acoustic wave component.Meanwhile, utilize zero intermediate frequency reciver unit to measure oscillation frequency shifts value, further and micro-control unit MCU according to the relation between oscillation frequency shifts value, and determine temperature value to be measured.Adopt the mode that Direct Digital Frequency Synthesizers DDS module and phase-locked loop pll frequency multiplication combine, for micro-control unit MCU provides radio-frequency carrier flexibly.Zero intermediate frequency reciver unit, what settle at one go extracts frequency deviation, simplifies frequency deviation measurement.Controller transceiver adopts TDD(time division duplex) structure, avoid and use expensive FDD diplexer, reduce cost.
Description
Technical field
The present invention relates to temperature testing equipment field, particularly relate to a kind of passive wireless temperature sensor based on surface acoustic wave.
Background technology
In industry, power industry, in electric equipment operation process, the too high or too low of temperature all means the possibility that fault produces.Conventional active wired temperature survey mode cycle is long, construction is complicated, efficiency is low, inconvenience management.
In today that sensor technology develops rapidly, for the special occasions of many application, online between sensor and unit under test normally cannot realize, such as, with online sensor carry out rotating, the parameter measurement of brush, rotor and much moving object time, many mechanical problems and circuit problem can be produced, there will be interruption, noise, cannot measure even at all.For another example, propeller tip speed and the measurement of angular velocity when helicopter rotates, the measurement of acceleration in car during car crass, the measurement etc. of doughnut internal pressure, temperature and friction, also be to adopt online mode, therefore, wireless senser must be adopted realize measurement.Wireless temperature measurement can solve dispersion, environment is closed etc. is not easy to the problem that connects up.At present, radio temperature sensor is mainly based on active radio sensor, and this sensor reception and transmission range is very far away, and available various circuit, controls and process convenient, flexible.But can not provide power supply for many, need the occasion of long term monitoring, or battery is not easily changeable passes the application of receiving position and the dangerous situation such as inflammable and explosive, this active radio sensor is obviously inapplicable.
Wireless senser can be divided into two kinds by energy-provision way difference: active and passsive sensor.The former is owing to there being the Power supplies such as battery, passes and receives distance, can adopt various circuit, controls and processes conveniently, flexibly, widespread use at present.But, can not power supply be provided for many, need the occasion of long term monitoring, or the application of the not easily changeable position of battery and the dangerous situation such as inflammable and explosive, this active wireless senser is obviously impracticable.Passsive sensor does not have power supply (as battery) directly to power, and it is the work maintaining sensor by electromagnetic energy.Such sensor can be divided into two classes again according to Energy Coupling mode: telefault coupled mode and sky line style.Adopt the electromagnetic coupled modes such as coil, energy mainly concentrates on the very near region of hub of a spool, and the distance of its launching and receiving is very near, and the distance of 1 meter has been the coupling limit, and the long range systems of more than 1 meter is very rare especially.Further, the electric energy of coupling is directly supplied to sensor and treatment circuit, therefore, requires that the energy launched is very large.It linear sensor adopts the electromagnetic energy of antenna collection space, is then converted into the energy of other form efficiently, as power supply, sound wave etc.It linear sensor can sense the size of various physical quantity, and the signal after modulation changes into electromagnetic energy efficiently by antenna and sends to long-range receiving system, realizes the wireless biography of passive type and receives and measure.Due to the difference of energy conversion mode, it has farther measuring distance than the sensor of inductive coupling in theory.
At present, surface acoustic wave component the electromagnetic energy of antenna directly, is efficiently converted to acoustic energy to carry out one of optimal components of launching and receiving.But the generation of radio-frequency carrier needs frequency mixer usually, but in 433MHzISM frequency range, if adopt mixer design, then have a lot of shortcoming, such as, revise frequency dumb.In passive temp measuring system controller, need by Received signal strength relative to after the frequency deviation measurement transmitted out.Usual way uses frequency mixer to obtain baseband signal, then measuring-signal bandwidth.But this method needs the discrete component such as low noise amplifier and radio-frequency filter, add cost and the complexity of system.Simultaneously there is frequency deviation owing to launching between carrier wave and reception carrier, FDD(Frequency Division Duplexing (FDD) can be used) structure carries out the launching and receiving of signal simultaneously, but needs expensive diplexer.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides one can extracting directly frequency deviation, based on the passive wireless temperature sensor of surface acoustic wave.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of passive wireless temperature sensor based on surface acoustic wave, comprise saw sensor, described surface acoustic wave sensing is connected with BPF or is connected with zero intermediate frequency reciver, it is characterized in that, zero intermediate frequency reciver unit and the A/D converter, micro-control unit MCU, radio-frequency carrier generation unit, power amplifier PA, the wave filter BPF that are connected successively with zero intermediate frequency reciver unit output terminal, described radio-frequency carrier generation unit output terminal is connected with zero intermediate frequency reciver unit input end
Described radio-frequency carrier generation unit, for providing radio-frequency carrier, thus encourages described saw sensor to create reception carrier; Described zero intermediate frequency reciver unit, the reception carrier for receiving surface sonic sensor also extracts the frequency deviation measurement of launching between carrier wave and reception carrier;
Described micro-control unit MCU, launches carrier wave calculate reception carrier frequency according to frequency deviation measurement for controlling radio-frequency carrier generation unit, then will calculate reception carrier frequency and be scaled temperature value.
As the improvement of technique scheme, described zero intermediate frequency reciver unit comprises the low noise amplifier LNA, frequency mixer Mixer and the radio-frequency filter LPF that connect successively.
As the improvement of technique scheme, described radio-frequency carrier generation unit comprises Direct Digital Frequency Synthesizers DDS and phase-locked loop pll, and described phase-locked loop pll output terminal is connected with described frequency mixer Mixer.
As the improvement of technique scheme, described Direct Digital Frequency Synthesizers DDS comprises the phase accumulator, wave memorizer ROM, D/A converter and the wave filter that connect successively.
As the improvement of technique scheme, described phase-locked loop pll comprises the phase detector PD, low-pass filter filtering LPF and the voltage controlled oscillator VCO that connect successively.
As the improvement of technique scheme, the transceiver of described micro-control unit MCU adopts TDD structure.
As the improvement of technique scheme, the concrete steps of described phase detector PD are: phase detector inspection PD surveys the phase differential of input signal and output signal, and the phase signal detected is converted to the output of Vd (t) voltage signal, this signal forms the control voltage Vc (t) of voltage controlled oscillator after low-pass filter filtering, implements to control to the frequency of voltage controlled oscillator output signal Vo (t).
Beneficial effect of the present invention has:
Based on a passive wireless temperature sensor for surface acoustic wave, the electromagnetic energy of special frequency channel in antenna collection space, is then converted into other forms of energy, efficiently as power supply, sound wave etc.Due to piezoelectric effect and inverse piezoelectric effect, electromagnetic wave and surface acoustic wave can be changed by saw sensor mutually, realize electromechanical energy and exchange, and the electromagnetic energy of antenna is directly efficiently converted to acoustic energy and carries out biography receipts by surface acoustic wave component.Meanwhile, utilize zero intermediate frequency reciver unit to measure oscillation frequency shifts value, further and micro-control unit MCU according to the relation between oscillation frequency shifts value, and determine temperature value to be measured.Adopt the mode that Direct Digital Frequency Synthesizers DDS module and phase-locked loop pll frequency multiplication combine, for micro-control unit MCU provides radio-frequency carrier flexibly.Zero intermediate frequency reciver unit, what settle at one go extracts frequency deviation, simplifies frequency deviation measurement.Controller transceiver adopts TDD(time division duplex) structure, avoid and use expensive FDD diplexer, reduce cost.
Accompanying drawing explanation
Below in conjunction with drawings and the specific embodiments, the invention will be further described, wherein:
Fig. 1 is the system construction drawing of the embodiment of the present invention;
Fig. 2 is the Direct Digital Frequency Synthesizers DDS schematic diagram of the embodiment of the present invention;
Fig. 3 is the phase-locked loop pll schematic diagram of the embodiment of the present invention.
Embodiment
See Fig. 1, a kind of passive wireless temperature sensor based on surface acoustic wave, comprise saw sensor 7, described surface acoustic wave sensing 7 is connected with wave filter BPF4 or is connected with zero intermediate frequency reciver 5, it is characterized in that, zero intermediate frequency reciver unit 5 and the A/D converter 6, micro-control unit MCU1, radio-frequency carrier generation unit 2, power amplifier PA3 and the wave filter BPF4 that are connected successively with zero intermediate frequency reciver unit 5 output terminal, described radio-frequency carrier generation unit 2 output terminal is connected with zero intermediate frequency reciver unit 5 input end.
Described zero intermediate frequency reciver unit 5, the reception carrier for receiving surface sonic sensor 7 also extracts the frequency deviation measurement of launching between carrier wave and reception carrier.Zero intermediate frequency reciver unit 5 comprises the low noise amplifier LNA51, frequency mixer Mixer52 and the radio-frequency filter LPF53 that connect successively, utilize low noise amplifier 51, frequency mixer 52 and radio-frequency filter 53 wherein, direct formation zero intermediate frequency reciver, what settle at one go extracts frequency deviation, simplifies frequency deviation measurement.
With further reference to Fig. 2 and Fig. 3, described radio-frequency carrier generation unit 2, for providing radio-frequency carrier, thus encourages described saw sensor 7 to create reception carrier; Described micro-control unit MCU1, for calculating reception carrier frequency according to frequency deviation measurement, then will calculate reception carrier frequency and be scaled temperature value.Radio-frequency carrier generation unit 2 comprises Direct Digital Frequency Synthesizers DDS21 and phase-locked loop pll 22, and described phase-locked loop pll 22 output terminal is connected with described frequency mixer Mixer52.Direct Digital Frequency Synthesizers DDS21 comprises phase accumulator 211, wave memorizer ROM212, D/A converter 213, wave filter 214.Described phase-locked loop pll 22 comprises phase detector PD221, low-pass filter filtering LPF222 and voltage controlled oscillator VCO 223.
Its principle of work is: phase accumulator 211 is made up of N position totalizer and the accumulator register cascade of N position.Often carry out a time clock fs, frequency control word k is added with the accumulated phase data that accumulator register exports by totalizer, the result after addition is delivered to the data input pin of accumulator register.The new phase data feedback that totalizer produces by accumulator register after a upper time clock effect, to the input end of totalizer, continues under the effect of next time clock to make totalizer to be added with frequency control word k.Like this, phase accumulator 211, under clock effect, constantly carries out linear phase to frequency control word and adds up.Phase accumulator 211, when each time clock inputs, accumulates once frequency control word, and the data that phase accumulator 211 exports are exactly the phase place of composite signal, and the spilling frequency of phase accumulator is exactly the signal frequency that DDS21 exports.The data exported with phaser 211, as the phase-samplomh address of wave memorizer ROM212, so just can be found the waveform sample value (binary coding) be stored in wave memorizer, are completed phase place and change to amplitude through look-up table.D/A converter 213 is delivered in the output of wave memorizer, and the waveforms amplitude of digital quantity form is converted to the analog quantity form signal of required frequency synthesis by D/A converter 213.Low-pass filter 214 for the unwanted sampling component of filtering so that the sine wave signal that output spectrum is pure.Phase detector 221 detects the phase differential of input signal and output signal, and the phase signal detected is converted to the output of Vd (t) voltage signal, this signal forms the control voltage Vc (t) of voltage controlled oscillator 223 after low-pass filter filtering 222, frequency voltage controlled oscillator 223 being outputed signal to Vo (t) is implemented to control, for micro-control unit MCU provides radio-frequency carrier flexibly, this carrier wave is also supplied to controller receiver mixing use simultaneously
Micro-control unit MCU1, launch carrier wave for controlling radio-frequency carrier generation unit 2 and calculate reception carrier frequency according to frequency deviation measurement, reception carrier frequency will be calculated again and be scaled temperature value, its transceiver adopts TDD(time division duplex) structure, avoid and use expensive diplexer, reduce the cost of controller.
The above, just better embodiment of the present invention, but the present invention is not limited to above-described embodiment, as long as it reaches technique effect of the present invention with any same or similar means, all should belong to protection scope of the present invention.
Claims (7)
1. the passive wireless temperature sensor based on surface acoustic wave, comprise saw sensor (7), described saw sensor (7) and wave filter BPF(4) or zero intermediate frequency reciver unit (5) be connected, it is characterized in that, zero intermediate frequency reciver unit (5) and the A/D converter (6) be connected successively with zero intermediate frequency reciver unit (5) output terminal, micro-control unit MCU(1), radio-frequency carrier generation unit (2), power amplifier PA(3), wave filter BPF(4), described radio-frequency carrier generation unit (2) output terminal is connected with zero intermediate frequency reciver unit (5) input end,
Described radio-frequency carrier generation unit (2), for providing transmitting carrier wave, encourages described saw sensor (7) to produce reception carrier;
Described zero intermediate frequency reciver unit unit (5), the reception carrier for receiving surface sonic sensor (5) also extracts the amounts of frequency offset of launching between carrier wave and reception carrier;
Described micro-control unit MCU(1), launch carrier wave calculate reception carrier frequency according to amounts of frequency offset for controlling radio-frequency carrier generation unit (2), then reception carrier frequency will be calculated be scaled temperature value.
2. a kind of passive wireless temperature sensor based on surface acoustic wave according to claim 1, it is characterized in that, described zero intermediate frequency reciver unit (5) comprises the low noise amplifier LNA(51 connected successively), frequency mixer Mixer(52) and radio-frequency filter LPF(53).
3. a kind of passive wireless temperature sensor based on surface acoustic wave according to claim 1, it is characterized in that, described radio-frequency carrier generation unit (2) comprises Direct Digital Frequency Synthesizers DDS(21) and phase-locked loop pll (22), described phase-locked loop pll (22) output terminal and described frequency mixer Mixer(52) be connected.
4. a kind of passive wireless temperature sensor based on surface acoustic wave according to claim 3, it is characterized in that, described Direct Digital Frequency Synthesizers DDS(21) comprise the phase accumulator (211), the wave memorizer ROM(212 that connect successively), D/A converter (213) and wave filter (214).
5. a kind of passive wireless temperature sensor based on surface acoustic wave according to claim 3, is characterized in that, described phase-locked loop pll (22) comprises phase detector PD(221), low-pass filter filtering LPF(222) and voltage controlled oscillator VCO (223).
6. a kind of passive wireless temperature sensor based on surface acoustic wave according to claim 1, is characterized in that, described micro-control unit MCU(1) transceiver adopt TDD structure.
7. a kind of passive wireless temperature sensor based on surface acoustic wave according to claim 5, it is characterized in that, described phase detector PD(221) concrete steps be: phase detector inspection PD(221) survey the phase differential of input signal and output signal, and the phase signal detected is converted to the output of Vd (t) voltage signal, this signal forms the control voltage Vc (t) of voltage controlled oscillator (223) after low-pass filter (222) filtering, implements to control to the frequency of voltage controlled oscillator (223) output signal Vo (t).
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Cited By (4)
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| CN106053609A (en) * | 2016-06-08 | 2016-10-26 | 徐洪军 | Device for monitoring hydrogen leakage of steam turbine generator set on line on basis of wireless passive technology |
| CN107196623A (en) * | 2016-03-15 | 2017-09-22 | 络达科技股份有限公司 | Acoustic wave device with active calibration mechanism |
| CN110487439A (en) * | 2019-09-06 | 2019-11-22 | 叶志刚 | A kind of superhigh precision measurement method of temperature |
| 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 |
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| CN110487439A (en) * | 2019-09-06 | 2019-11-22 | 叶志刚 | A kind of superhigh precision measurement method of temperature |
| CN110487439B (en) * | 2019-09-06 | 2021-01-29 | 叶志刚 | Ultrahigh-precision temperature measuring method |
| 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 |
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