CN108519167A - Wireless photon temperature-sensing system and method - Google Patents
Wireless photon temperature-sensing system and method Download PDFInfo
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- CN108519167A CN108519167A CN201810339835.8A CN201810339835A CN108519167A CN 108519167 A CN108519167 A CN 108519167A CN 201810339835 A CN201810339835 A CN 201810339835A CN 108519167 A CN108519167 A CN 108519167A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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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
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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Abstract
Wireless photon temperature-sensing system and method, it is related to photoelectron to measure and wireless communication interleaving techniques field, this is wireless, and photon temperature-sensing system includes multiple base stations and a central station, all base stations include temperature inductor, No. 1 amplifier, No. 2 amplifiers, No. 1 filter, No. 2 filters, No. 3 filters, No. 1 circulator and No. 1 antenna, and temperature inductor includes thermocouple, adapter circuit, bias device, laser, electro-optic phase modulator, photodetector, No. 1 coupler, No. 2 couplers, No. 1 optical fiber and No. 2 optical fiber；Central station includes computer, oscillator, No. 3 amplifiers, No. 4 filters, No. 5 filters, No. 2 circulators, power meter and No. 2 antennas；No. 1 antenna and No. 2 antennas can transmitting/receiving wireless electromagnetic waves.The sensing process of above-mentioned wireless photon temperature-sensing system is completed in front end, can be overcome interference of the noise to transducing signal well, be improved the sensitivity of sensor-based system.
Description
Technical field
It is measured the present invention relates to photoelectron and wirelessly communicates interleaving techniques field, especially a kind of wireless photon temperature sensing
System and method.
Background technology
Temperature is to characterize the physical quantity of the cold and hot degree of object, is a critically important and universal survey during industrial and agricultural production
Measure parameter.The measurement and control of temperature are to ensureing product quality, improving production efficiency, energy saving, production safety, promotion its people
Expanding economy is played the role of very important.Temperature sensor is to experience temperature, and can be according to certain rule by temperature
It is converted into the device or device of available output electric signal, it is the core component of the measurement and control of realizing temperature, extensive
Applied to various industrial environments, it is related to numerous industries such as aerospace, military project, petrochemical industry, oil well, electric power, ship, lathe, pipeline.
In most cases, temperature sensor be collected temperature signal is transmitted using wire laying mode, but
In the case where communication distance is remote, environment is more severe, temperature sensor then transmits signal by the way of wireless telecommunications, currently
Radio temperature sensor be the baseband signal that temperature information is changed into nearly near DC, then modulate the signals onto again to suitable
The carrier wave for closing wireless transmission gets on, and is finally sent to central station and is handled, the defect of such sensing mode is：Temperature information
The process for being converted into electric signal is completed in nearly DC terminal, for electronic system, the noise component complexity of nearly DC terminal,
And much larger than the noise of front end, when temperature sensor signal is faint, it is easy to be flooded by system noise, this severely limits sensings
The sensitivity of device.
Invention content
It is aforementioned wireless technical problem to be solved by the invention is to provide a kind of wireless photon temperature-sensing system and method
Photon temperature sensor-based system can solve the problems, such as that its sensitvity constraint of conventional wireless temperature-sensing system, entire sensing process exist
Front end is completed, and can be overcome interference of the noise to transducing signal well, be improved the sensitivity of sensor-based system.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme that：A kind of wireless photon temperature-sensing system,
Including multiple base stations and a central station, each base station is used to respective collected temperature information being changed into microwave power gain simultaneously
By radiotechnics to the transducing signal of air passage transmitting band temperature information, the central station for send oscillator signal to
Each base station receives the transducing signal from each base station and is reduced into temperature value, the center by signal processing, calibration and calculating
It stands using progress temperature wireless sensing between frequency multiplexing technique and each base station.
Further, the base station includes temperature inductor, No. 1 amplifier, No. 2 amplifiers, No. 1 filter, No. 2 filtering
No. 1 antenna of device, No. 3 filters, No. 1 circulator and transmitting/receiving wireless electromagnetic wave；The input terminal of the temperature inductor and No. 2
The input terminal of amplifier connects, and the output end of No. 2 amplifiers is connect with the input terminal of No. 3 filters, No. 3 filters
Output end connect with No. 1 circulator, the input terminal of No. 1 amplifier is also connect with No. 1 circulator, No. 1 amplifier
Output end connect with the input terminal of No. 2 filters, the input terminal of the output ends of No. 2 filters and temperature inductor connects
It connects, No. 1 filter is connect with No. 1 circulator, No. 1 antenna respectively；The temperature inductor is for changing temperature information
For microwave power gain.
Further, the central station include computer, oscillator, No. 3 amplifiers, No. 4 filters, No. 5 filters,
No. 2 antennas of No. 2 circulators, power meter and transmitting/receiving wireless electromagnetic wave；The computer is by controlling the production of line traffic control oscillator
Raw oscillator signal, the output end of the oscillator are electrically connected with No. 2 circulators, the input terminals of No. 3 amplifiers also with No. 2 rings
Shape device connects, and the output end of No. 3 amplifiers connect with the input terminal of No. 5 filters, the output end of No. 5 filters and
The input terminal of power meter connects, and the output end of the power meter is connect with computer, No. 4 filters respectively with No. 2 annulars
Device, No. 2 antenna connections.
Further, the temperature inductor include temperature sensor, bias device, laser, electro-optic phase modulator,
Photodetector, No. 1 coupler, No. 2 couplers, No. 1 optical fiber and No. 2 optical fiber, the direct current of the temperature sensor and bias device
Input terminal connects, and the output end of the bias device and the bias voltage input of electro-optic phase modulator connect, the laser
Connect with the input terminal of No. 1 coupler, the output end of No. 1 coupler respectively with one end of No. 1 optical fiber and electric light phase tune
The light input end of device processed connects, the other end of No. 1 optical fiber, the light output end of electro-optic phase modulator with No. 2 couplers
Input terminal connection, the output end of No. 2 couplers connect with one end of No. 2 optical fiber, the other end and light of No. 2 optical fiber
The light input end of electric explorer connects, the ac input end of the bias device as microwave input port, the photodetector
Electricity output end is as microwave output end.
Further, it is electrically connected with amplification between the temperature sensor and bias device and adjusts temperature sensor output
The adapter circuit of signal.
Further, the temperature sensor uses thermocouple.
Preferably, change injection electro-optic phase modulator there are one being also electrically connected between the laser and No. 1 coupler
The adjustable optical attenuator of luminous power.
Based on inventive concept same as above-mentioned wireless photon temperature-sensing system, the present invention also provides a kind of wireless photons
Temperature sensing method, including：Mach-increasing Dare type interferometer is built, laser emits optical signal and is divided into up and down by coupler
Two branches, upper branch optical signal enters coupler with lower branch by optical fiber by the optical signal of electro-optic phase modulator to be done
It relates to；The oscillator of central station is controlled by computer and generates microwave oscillation signal, which is received by base station by radio communication,
Microwave input signal source as base station；Build the temperature inductor of microwave photon link formula, the temperature signal of thermocouple detection
Direct current biasing electricity of the oscillating microwave signal generated with the central station oscillator received respectively as Mach-increasing Dare interferometer
Pressure and microwave input signal are realized intensity modulated of the microwave input signal to optical signal, and are controlled directly by temperature change
The size of bias voltage is flowed, and then influences the power gain of microwave signal, to realize the transformation of temperature-microwave power gain；
Transducing signal is transmitted to central station finally by radiotechnics, the performance number of the signal is read in central station and is calibrated
With calculating, it is converted into temperature value, realizes temperature sensing.
Further, in conjunction with wireless photon temperature-sensing system recited above, wireless photon temperature involved by the present invention passes
Sensing method specifically includes following steps：
1) it generates and transmits oscillator signal：
The computer of central station is given an order by control pair oscillator makes it generate oscillator signal, which passes through
No. 2 circulators are sent to No. 4 filters and realize noise and spurious reduction, and No. 1 day of base station is then sent to by No. 2 antennas
Line is filtered using No. 1 filter after being received by No. 1 antenna and reaches No. 1 circulator, and No. 1 circulator guiding signal enters
It is incident upon No. 1 amplifier, amplified signal is incident to the ac input end of the bias device of temperature inductor by No. 2 filters；
2) transformation of temperature information-microwave power gain：
In temperature inductor, laser emits optical signal and is divided into two branches up and down, upper branch light letter by No. 1 coupler
Number interfered into No. 2 couplers by the optical signal of electro-optic phase modulator with lower branch by No. 1 optical fiber, constitutes horse
It is conspicuous-to increase Dare type interferometer；Thermocouple detects temperature signal and is converted to the voltage signal at its both ends, which passes through suitable
It is input in bias device from the direct-flow input end of bias device after amplification and adjustment with circuit, at this point, bias device direct-flow input end
Signal and ac input end signal be overlapped in bias device processing after export, the biasing as electro-optic phase modulator
Voltage, electro-optic phase modulator under the action of bias voltage to optical signal carry out phase-modulation, No. 2 couplers by lower branch
The optical signal of phase modulation carries out interference with upper branch optical signal and is superimposed, laggard by No. 2 fiber delay times after final realization intensity modulated
Enter photodetector and is reduced into electric signal, it is final to realize microwave output.In the temperature inductor, link gain and direct current biasing
Voltage is related, i.e., related to the temperature signal of thermocouple induction, the relationship of thermocouple both end voltage and temperature is：
Ut=f (T)
Wherein, T is environment temperature, the relationship ratio of thermocouple both end voltage and temperature according to the concrete model of thermocouple and
It is fixed；
It is in the DC offset voltage of electro-optic phase modulator by bias device load：
Vd(T)=(Ut-U0)g
Wherein, U0For the minimum voltage of thermocouple sensing, g is adapter circuit gain, UoIt should make 0≤V with the value of gd
(T)≤0.5Vπ, VπFor the half-wave voltage of electro-optic phase modulator, which is determined by the electro-optic phase modulator of concrete model；
The input-output microwave power gain of temperature inductor is：
Wherein, β is the transmission loss of No. 2 optical fiber, and ρ is the responsiveness of photodetector, PinTo be inputted in temperature inductor
Luminous power, ZLWith ZinRespectively link load impedance and input impedance are 50 Ω；
3) signal processing and calculating：
The microwave signal exported from temperature inductor reaches No. 1 circulator, No. 1 ring by No. 2 amplifiers and No. 3 filters
Shape device guides signal to emit to No. 2 antennas by No. 1 antenna after No. 1 filter, and central station receives base station by No. 2 antennas
Then signal reaches No. 3 amplifiers by 4, No. 2 circulators of No. 4 filters, work(is reached by No. 5 filters after signal amplification
Rate meter realizes power detection, and power data is finally sent to computer, the output power P that computer passes through analysis oscillatore
With the reception power P of power meterrTo calculate gain G=P of entire linkr/Pe, temperature inductor is disregarded, in entire communication link
Overall gain caused by other devices is Ge, then have G=GoGe, that is, have：
Wherein, GeIt can be obtained by system calibration, be based on above formula link gain G and Vd(T) relationship can solve Vd
(T) then value solves the value of temperature sensor T, to realize temperature sensing.
The present invention is based on wireless photon technologies to build microwave photon link, and temperature information is changed into microwave power gain,
Temperature sensing is realized in front end, is effectively prevented the negative effect of the nearly dc noise of sensor-based system, is improved sensor-based system
Sensitivity.Specifically, the present invention first uses oscillator to provide oscillating microwave signal for temperature inductor, then uses temperature sense
Device realize temperature-microwave power gain conversion, after the transducing signal for carrying temperature information is sent to by radiotechnics
Central station, progress signal processing, the temperature value that transducing signal is calculated breach conventional temperature to realize temperature sensing
The limitation of sensor-based system.In addition, the wireless photon temperature-sensing system of the present invention realizes central station using frequency multiplexing technique
To the communication of multiple transducing signal base stations, be conducive to covering all around for sensing network.
Description of the drawings
Fig. 1 is the schematic network structure of the wireless photon temperature-sensing system in the present invention；
Fig. 2 is the overall structure diagram of the wireless photon temperature-sensing system in the present invention；
Fig. 3 is the structural schematic diagram of the temperature inductor in the present invention；
Fig. 4 is the relationship of the DC offset voltage and microwave power gain of the temperature inductor obtained using present invention measurement
Figure.
Specific implementation mode
For the ease of the understanding of those skilled in the art, the present invention is made further with reference to embodiment and attached drawing
Bright, the content that embodiment refers to not is limitation of the invention.
Present invention is primarily based on following technical thoughts：Mach-increasing Dare type interferometer is first built, laser emits optical signal
It is divided into two branches up and down by coupler, upper branch optical signal is believed by optical fiber and lower branch by the light of electro-optic phase modulator
Number interfered into coupler；The oscillator of central station is controlled by computer and generates microwave oscillation signal, which passes through
Wireless communication is received by base station, the microwave input signal source as base station；The temperature inductor of microwave photon link formula is built again,
The oscillating microwave signal that the temperature signal of thermocouple detection and the central station oscillator received generate is respectively as Mach-increasing moral
The DC offset voltage and microwave input signal of your interferometer, realize intensity modulated of the microwave input signal to optical signal, and
The size of DC offset voltage is controlled by temperature change, and then influences the power gain of microwave signal, to realize temperature-
The transformation of microwave power gain；Transducing signal is transmitted to central station finally by radiotechnics, the letter is read in central station
Number performance number and calibrated and calculated, be converted into temperature value, realize temperature sensing.
Fig. 1 shows a kind of schematic network structure of wireless photon temperature-sensing system, which includes N number of base
Stand and a central station, using frequency multiplexing technique realize N number of base station to central station temperature wireless sensing, central station with it is each
Communication frequency between base station corresponds to f respectively1、f2、f3...fn。
The overall structure of the central station and single base station in wireless photon temperature-sensing system has been shown in particular in Fig. 2 and Fig. 3
Figure, base station includes temperature inductor, No. 1 amplifier, No. 2 amplifiers, No. 1 filter, No. 2 filters, No. 3 filters, No. 1 ring
Shape device and No. 1 antenna, temperature inductor include thermocouple, adapter circuit, bias device, laser, electro-optic phase modulator, light
Electric explorer, No. 1 coupler, No. 2 couplers, No. 1 optical fiber and No. 2 optical fiber；Central station includes computer, oscillator, No. 3 amplifications
Device, No. 4 filters, No. 5 filters, No. 2 circulators, power meter and No. 2 antennas；The input terminal of thermocouple and adapter circuit connects
It connects, the direct-flow input end of the output end of adapter circuit and bias device connects, the output end of bias device and electro-optic phase modulator
Bias voltage input connects, and laser connect with the input terminal of No. 1 coupler, the output end of No. 1 coupler respectively with No. 1 light
The light input end connection of fine one end, electro-optic phase modulator, the other end of No. 1 optical fiber, the light output of electro-optic phase modulator
End is connect with the input terminal of No. 2 couplers, and the output end of No. 2 couplers is connect with one end of No. 2 optical fiber, No. 2 optical fiber it is another
The light input end of one end and photodetector connects, and the electricity output end of photodetector is connect with the input terminal of No. 2 amplifiers, and 2
The output end of number amplifier is connect with the input terminal of No. 3 filters, and the output end of No. 3 filters is connect with No. 1 circulator, No. 1
The input terminal of amplifier is also connect with No. 1 circulator, and the output end of No. 1 amplifier is connect with the input terminal of No. 2 filters, No. 2
The output end of filter and the ac input end of bias device connect, and No. 1 filter is connect with No. 1 circulator, No. 1 antenna, No. 1 filter
Wave device is set between No. 1 circulator and No. 1 antenna；Computer generates oscillator signal, oscillator by controlling line traffic control oscillator
Output end connect with No. 2 circulators, the input terminal of No. 3 amplifiers is also connect with No. 2 circulators, the output end of No. 3 amplifiers
It is connect with the input terminal of No. 5 filters, the input terminal connection of the output end and power meter of No. 5 filters, the output end of power meter
It is connect with computer, No. 4 filters are connect with No. 2 circulators, No. 2 antennas respectively, and No. 4 filters are set to No. 2 circulators and No. 2
Between antenna；No. 1 antenna and No. 2 antennas can transmitting/receiving wireless electromagnetic wave, the two carries out for realizing between base station and central station
Wireless communication.
Wireless photon temperature-sensing system based on the above embodiment carries out temperature sensing, specific steps and data point
Analysis is as follows：
1) it generates and transmits oscillator signal：
The computer of central station is given an order by control pair oscillator makes it generate oscillator signal, which passes through
No. 2 circulators are sent to No. 4 filters and realize noise and spurious reduction, and No. 1 day of base station is then sent to by No. 2 antennas
Line is filtered using No. 1 filter after being received by No. 1 antenna and reaches No. 1 circulator, and No. 1 circulator guiding signal enters
It is incident upon No. 1 amplifier, amplified signal is incident to the ac input end of the bias device of temperature inductor by No. 2 filters；
2) transformation of temperature information-microwave power gain：
In temperature inductor, laser emits optical signal and is divided into two branches up and down, upper branch light letter by No. 1 coupler
Number interfered into No. 2 couplers by the optical signal of electro-optic phase modulator with lower branch by No. 1 optical fiber, constitutes horse
It is conspicuous-to increase Dare type interferometer；Thermocouple detects temperature signal and is converted to the voltage signal at its both ends, which passes through suitable
It is input in bias device from the direct-flow input end of bias device after amplification and adjustment with circuit, at this point, bias device direct-flow input end
Signal and ac input end signal be overlapped in bias device processing after export, the biasing as electro-optic phase modulator
Voltage, electro-optic phase modulator under the action of bias voltage to optical signal carry out phase-modulation, No. 2 couplers by lower branch
The optical signal of phase modulation carries out interference with upper branch optical signal and is superimposed, laggard by No. 2 fiber delay times after final realization intensity modulated
Enter photodetector and is reduced into electric signal, it is final to realize microwave output.In the temperature inductor, link gain and direct current biasing
Voltage is related, i.e., related to the temperature signal of thermocouple induction, the relationship of thermocouple both end voltage and temperature is：
Ut=f (T) (1)
Wherein, T is environment temperature, the relationship ratio of thermocouple both end voltage and temperature according to the concrete model of thermocouple and
Determine, can be learnt by consulting service manual, adapter circuit is intended to make DC offset voltage with amplification by the adjustment of voltage
Value range is 0-0.5Vπ, VπFor the half-wave voltage of modulator, value is determined by corresponding modulator, is loaded by bias device
It is in the DC offset voltage of phase-modulator：
Vd(T)=(Ut-U0)g (2)
Wherein, UoFor the minimum voltage of thermocouple sensing, g is adapter circuit gain, UoIt should make 0≤V with the value of gd
(T)≤0.5Vπ, VπFor the half-wave voltage of electro-optic phase modulator, which is determined by the electro-optic phase modulator of concrete model.
Temperature inductor as shown in Figure 3, i.e., Mach above-mentioned-increasing Dare interference structure, the upper arm of the structure, which is not added with, appoints
What electric signal, underarm is by bias device power up signal, and the electric signal is by d. c. voltage signal and ac voltage signal two parts group
At if input light carrier is：
Ein=E0cosωct (3)
Wherein, EoFor the amplitude of light carrier, ωcFor angular frequency, t is the time, then two optical signals after waveguide by that can indicate
For：
Wherein, VmwFor ac voltage signal, VπFor the half-wave voltage of electro-optic phase modulator, pass through after No. 2 couplers two
The interference of light is represented by：
Output optical power after being converted into luminous power and can must being concerned with is：
Wherein, PoutWith PinRespectively export the luminous power with input；The electric signal of input by d. c. voltage signal with exchange
Voltage signal two parts form.It is not difficult to find out by above formula, the relationship of Output optical power and input electrical signal journey SIN function is that is, complete
At electric signal to the intensity modulated of light carrier.
Intensity modulated of the electric signal to light carrier is realized based on above structure and method, realizes electro-optic intensity modulator
Function, modulated optical signal in photodetector output end is reduced into electric signal after being transmitted in No. 2 optical fiber.If microwave photon
The ac voltage signal of the input signal of link is：
Vmw=V0cosωt
(9)
The signal is modulated light intensity by intensity modulator, and is finally reduced into photodetector output end micro-
Wave signal.If the transmission loss of No. 2 optical fiber is β, the responsiveness of detector is ρ, then the microwave signal of final output is：
Above formula is subjected to Bessel function of the first kind expansion, the relational expression P based on electricity basic knowledge-power P Yu voltage V
=V2/ R, wherein R are impedance value, can must export ac signal power and input signal power ratio, i.e., temperature inductor is defeated
Entering-export microwave power gain is：
Wherein, ZLWith ZinRespectively link load impedance and input impedance are 50 Ω.
3) signal processing and calculating：
The microwave signal exported from temperature inductor reaches No. 1 circulator, No. 1 ring by No. 2 amplifiers and No. 3 filters
Shape device guides signal to emit to No. 2 antennas by No. 1 antenna after No. 1 filter, and central station receives base station by No. 2 antennas
Then signal reaches No. 3 amplifiers by 4, No. 2 circulators of No. 4 filters, work(is reached by No. 5 filters after signal amplification
Rate meter realizes power detection, and power data is finally sent to computer, the output power P that computer passes through analysis oscillatore
With the reception power P of power meterrTo calculate gain G=P of entire linkr/Pe, temperature inductor is disregarded, in entire communication link
Overall gain caused by other devices is Ge, then have G=GoGe, that is, have：
Wherein, GeIt can be obtained by system calibration, based on formula (1), (2), (12), sense is finally solved by computer
The value for answering temperature T, to realize temperature sensing.
Further, control conversion can be carried out to the power gain of temperature inductor, explain to understand temperature information in depth
The relationship for stating the DC offset voltage and microwave power gain of temperature inductor, the test that temperature inductor is built based on Fig. 3 are flat
Platform.Specifically, in the temperature-sensing system, laser uses the distributed feedback laser diode of model 1772, in view of
The high-power output of laser corresponds to the considerations of low relative intensity noise, allows laser works in saturation output power in test
Under, an adjustable optical attenuator (being not shown in Fig. 3) is followed by change the luminous power at injection modulator end, electro-optic phase modulator
Using the phase-modulator of model MPX-LN, the bandwidth of the phase-modulator is 40GHz, and photodetector uses model
The High Linear photodetector of DSC40, No. 1 amplifier, No. 2 amplifiers, No. 3 amplifiers are all made of the low noise of model HMC406
Sound microwave amplifier, No. 1 optical fiber, No. 2 optical fiber are all made of the telecommunication optical fiber delay line of model SMF-28, and oscillator uses model
Oscillation signal frequency for the analog signal generator of N5183B, the analog signal generator is 10GHz, other passive devices are equal
Using common model, according to abovementioned steps 1), 2), 3) tested, obtain test result as shown in Figure 4, measurement data with
Gross data can quite well, as DC offset voltage Vd(T) from 0 to 0.5VπWhen gradually increasing, temperature inductor corresponds to
Power gain in one-to-one relationship and with Vd(T) increase and gradually increase, above-mentioned test effect is further verified
The correctness of involved scheme of the invention.
Above-described embodiment is the preferable implementation of the present invention, and in addition to this, the present invention can be realized with other manner,
Do not depart from the technical program design under the premise of it is any it is obvious replacement within protection scope of the present invention.
In order to allow those of ordinary skill in the art more easily to understand the improvements of the present invention compared with the existing technology, this
Some attached drawings of invention and description have been simplified, and for the sake of clarity, present specification is omitted some other members
Element, those of ordinary skill in the art should be aware that the element that these are omitted also may make up present disclosure.
Claims (9)
1. wireless photon temperature-sensing system, it is characterised in that：Including multiple base stations and a central station, each base station is used for will be each
It is changed into microwave power gain and by radiotechnics to air passage transmitting band temperature information from collected temperature information
Transducing signal, the central station for send oscillator signal to each base station, receive and the transducing signal from each base station and pass through
Signal processing, calibration and calculating are reduced into temperature value, and the central station, which uses, carries out temperature between frequency multiplexing technique and each base station
Spend wireless sensing.
2. wireless photon temperature-sensing system according to claim 1, it is characterised in that：The base station includes temperature sense
Device, No. 1 amplifier, No. 2 amplifiers, No. 1 filter, No. 2 filters, No. 3 filters, No. 1 circulator and transmitting/receiving wireless electricity
No. 1 antenna of magnetic wave；The input terminal of the temperature inductor is connect with the input terminal of No. 2 amplifiers, No. 2 amplifiers it is defeated
Outlet is connect with the input terminal of No. 3 filters, and the output end of No. 3 filters is connect with No. 1 circulator, No. 1 amplification
The input terminal of device is also connect with No. 1 circulator, and the output end of No. 1 amplifier is connect with the input terminal of No. 2 filters, described
The output end of No. 2 filters and the input terminal of temperature inductor connect, No. 1 filter respectively with No. 1 circulator and No. 1 day
Line connects；The temperature inductor is used to temperature information being changed into microwave power gain.
3. wireless photon temperature-sensing system according to claim 1, it is characterised in that：The central station includes calculating
The 2 of machine, oscillator, No. 3 amplifiers, No. 4 filters, No. 5 filters, No. 2 circulators, power meter and transmitting/receiving wireless electromagnetic wave
Number antenna；The computer generates oscillator signal, the output end of the oscillator and No. 2 annulars by controlling line traffic control oscillator
Device connects, and the input terminal of No. 3 amplifiers is also connect with No. 2 circulators, the output end of No. 3 amplifiers and No. 5 filtering
The input terminal of device connects, and the output end of No. 5 filters and the input terminal of power meter connect, the output end of the power meter with
Computer connects, and No. 4 filters are connect with No. 2 circulators, No. 2 antennas respectively.
4. wireless photon temperature-sensing system according to claim 3, it is characterised in that：The temperature inductor includes temperature
Spend sensor, bias device, laser, electro-optic phase modulator, photodetector, No. 1 coupler, No. 2 couplers, No. 1 optical fiber
With No. 2 optical fiber, the direct-flow input end of the temperature sensor and bias device connects, output end and the electric light phase of the bias device
The bias voltage input of modulator connects, and the laser is connect with the input terminal of No. 1 coupler, No. 1 coupler
Output end is connect with the light input end of one end of No. 1 optical fiber and electro-optic phase modulator respectively, the other end of No. 1 optical fiber,
The light output end of electro-optic phase modulator is connect with the input terminal of No. 2 couplers, the output end of No. 2 couplers and No. 2
One end of optical fiber connects, and the other end of No. 2 optical fiber and the light input end of photodetector connect, the exchange of the bias device
Input terminal is as microwave input port, and the electricity output end of the photodetector is as microwave output end.
5. wireless photon temperature-sensing system according to claim 4, it is characterised in that：The temperature sensor and biasing
It is connected with amplification between device and adjusts the adapter circuit of temperature sensor output signal.
6. wireless photon temperature-sensing system according to claim 5, it is characterised in that：The temperature sensor is using warm
Galvanic couple.
7. wireless photon temperature-sensing system according to claim 5, it is characterised in that：The laser is coupled with No. 1
Also there are one the adjustable optical attenuators for changing injection electro-optic phase modulator luminous power for electrical connection between device.
8. wireless photon temperature sensing method, including：Mach-increasing Dare type interferometer is built, laser transmitting optical signal passes through
Coupler is divided into two branches up and down, upper branch optical signal by optical fiber and lower branch by the optical signal of electro-optic phase modulator into
Enter coupler to be interfered；The oscillator of central station is controlled by computer and generates microwave oscillation signal, which passes through wireless
Communication is received by base station, the microwave input signal source as base station；Build the temperature inductor of microwave photon link formula, thermocouple
The oscillating microwave signal that the temperature signal of detection and the central station oscillator received generate is interfered respectively as Mach-increasing Dare
The DC offset voltage and microwave input signal of instrument realize intensity modulated of the microwave input signal to optical signal, and pass through temperature
Degree changes to control the size of DC offset voltage, and then influences the power gain of microwave signal, to realize temperature-microwave work(
The transformation of rate gain；Transducing signal is transmitted to central station finally by radiotechnics, the work(of the signal is read in central station
Rate value is simultaneously calibrated and is calculated, and temperature value is converted into, and realizes temperature sensing.
9. wireless photon temperature sensing method according to claim 8, based on the wireless photon temperature described in claim 7
The sensing that sensor-based system carries out temperature signal is spent, is included the following steps：
1) it generates and transmits oscillator signal：
The computer of central station is given an order by control pair oscillator makes it generate oscillator signal, which passes through No. 2
Circulator is sent to No. 4 filters and realizes noise and spurious reduction, and No. 1 antenna of base station is then sent to by No. 2 antennas, leads to
It crosses to be filtered using No. 1 filter after No. 1 antenna receives and reaches No. 1 circulator, No. 1 circulator guiding signal is incident to 1
Number amplifier, amplified signal are incident to the ac input end of the bias device of temperature inductor by No. 2 filters；
2) transformation of temperature information-microwave power gain：
In temperature inductor, laser emits optical signal and is divided into two branches up and down by No. 1 coupler, and upper branch optical signal is logical
It crosses No. 1 optical fiber with lower branch to be interfered into No. 2 couplers by the optical signal of electro-optic phase modulator, constitutes Mach-increasing
Dare type interferometer；Thermocouple detects temperature signal and is converted to the voltage signal at its both ends, and the voltage signal is by being adapted to electricity
It is input in bias device from the direct-flow input end of bias device after the amplification and adjustment on road, at this point, the letter of bias device direct-flow input end
Number and ac input end signal be overlapped in bias device processing after export, the biased electrical as electro-optic phase modulator
Pressure, electro-optic phase modulator carry out phase-modulation under the action of bias voltage to optical signal, and No. 2 couplers are modulated by lower branch
The optical signal of phase carries out interference with upper branch optical signal and is superimposed, by entering after No. 2 fiber delay times after final realization intensity modulated
Photodetector is reduced into electric signal, final to realize microwave output.In the temperature inductor, link gain and direct current biasing electricity
Pressure is related, i.e., related to the temperature signal of thermocouple induction, the relationship of thermocouple both end voltage and temperature is：
Ut=f (T)
Wherein, T is environment temperature, and the relationship ratio of thermocouple both end voltage and temperature is depending on the concrete model of thermocouple；
It is in the DC offset voltage of electro-optic phase modulator by bias device load：
Vd(T)=(Ut-U0)g
Wherein, UoFor the minimum voltage of thermocouple sensing, g is adapter circuit gain, UoIt should make 0≤V with the value of gd(T)≤
0.5Vπ, VπFor the half-wave voltage of electro-optic phase modulator, which is determined by the electro-optic phase modulator of concrete model；
The input-output microwave power gain of temperature inductor is：
Wherein, β is the transmission loss of No. 2 optical fiber, and ρ is the responsiveness of photodetector, PinFor the light inputted in temperature inductor
Power, ZLWith ZinRespectively link load impedance and input impedance are 50 Ω；
1) signal processing and calculating：
The microwave signal exported from temperature inductor reaches No. 1 circulator, No. 1 circulator by No. 2 amplifiers and No. 3 filters
Signal is guided to emit to No. 2 antennas by No. 1 antenna after No. 1 filter, central station receives base station by No. 2 antennas to be believed
Number, No. 3 amplifiers then are reached by 4, No. 2 circulators of No. 4 filters, power is reached by No. 5 filters after signal amplification
Meter realizes power detection, and power data is finally sent to computer, the output power P that computer passes through analysis oscillatoreWith
The reception power P of power meterrTo calculate gain G=P of entire linkr/Pe, disregard temperature inductor, its in entire communication link
Overall gain caused by its device is Ge, then have G=GoGe, that is, have：
Wherein, GeIt can be obtained by system calibration, be based on above formula link gain G and Vd(T) relationship can solve Vd(T)
Then value solves the value of temperature sensor T, to realize temperature sensing.
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