CN108398144A - Aerospace fiber grating sensing system and method - Google Patents

Aerospace fiber grating sensing system and method Download PDF

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Publication number
CN108398144A
CN108398144A CN201711420701.0A CN201711420701A CN108398144A CN 108398144 A CN108398144 A CN 108398144A CN 201711420701 A CN201711420701 A CN 201711420701A CN 108398144 A CN108398144 A CN 108398144A
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CN
China
Prior art keywords
fiber
circuit
flouride
optical
signal
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CN201711420701.0A
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Chinese (zh)
Inventor
王学锋
卞贺明
唐才杰
蓝天
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China Aerospace Times Electronics Corp
Beijing Aerospace Control Instrument Institute
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China Aerospace Times Electronics Corp
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Priority to CN201711420701.0A priority Critical patent/CN108398144A/en
Publication of CN108398144A publication Critical patent/CN108398144A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light
    • G01D5/32Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/36Forming the light into pulses
    • G01D5/38Forming the light into pulses by diffraction gratings
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D18/00Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/028Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure

Abstract

The invention discloses a kind of aerospace fiber grating sensing system and methods.Wherein, which includes fiber Bragg grating (FBG) demodulator, fiber-optic grating sensor probe and transmission cable;Wherein, the light that the fiber Bragg grating (FBG) demodulator is sent out is transferred to the fiber-optic grating sensor by the transmission cable and pops one's head in, by comprising waiting for that the temperature of geodesic structure or the optical signal of dependent variable be reflected back the fiber Bragg grating (FBG) demodulator, the fiber Bragg grating (FBG) demodulator handles the optical signal being reflected back to obtain the temperature for waiting for geodesic structure or dependent variable fiber-optic grating sensor probe.The present invention solves the problems, such as the Flouride-resistani acid phesphatase that fiber grating sensing system is applied in aerospace environment.

Description

Aerospace fiber grating sensing system and method
Technical field
The invention belongs to fiber optic sensor technology fields, specifically, be related to a kind of aerospace fiber grating sensing system and Method.
Background technology
Fiber grating sensing system compared with conventional electrical sensor-based system have electromagnetism interference, corrosion-resistant, electric insulation, The advantages that multisensor is multiplexed.The advantages of fiber grating sensing system, makes it in engineering structure monitoring, electric power, petrochemical industry, sea Ocean, medicine etc. are multi-field to be obtained for extensive use.
In recent years, in aerospace field, fiber grating sensing system also becomes novel measurement technique and studies and using heat Point.But due to special environment conditions such as the irradiation of aerospace, vacuum, fiber grating sensing system, which is applied to aerospace environment, to be existed in many ways The technical difficulty in face.Currently, domestic, there has been no the patents of invention of the fiber grating sensing system for aerospace radiation environment.Currently For fiber grating sensing system under the effect of irradiation of aerospace environment, service life is extremely short, and it is easy to export measurement result It drifts about.How to overcome the effect of irradiation of aerospace environment to the opto-electronic device of fiber grating sensing system, electronic component Influence do not have feasible technological means always.
Invention content
Present invention solves the technical problem that being:A kind of aerospace has been overcome the deficiencies of the prior art and provide to be passed with fiber grating Sensing system and method solve the problems, such as the Flouride-resistani acid phesphatase that fiber grating sensing system is applied in aerospace environment.
The object of the invention is achieved by the following technical programs:According to an aspect of the invention, there is provided a kind of space Boat fiber grating sensing system, including:Fiber Bragg grating (FBG) demodulator, fiber-optic grating sensor probe and transmission cable;Wherein, institute It states the light that fiber Bragg grating (FBG) demodulator is sent out and the fiber-optic grating sensor probe, the optical fiber is transferred to by the transmission cable Grating sensor probe will be comprising waiting for that the temperature of geodesic structure or the optical signal of dependent variable be reflected back the fiber Bragg grating (FBG) demodulator, institute Fiber Bragg grating (FBG) demodulator is stated the optical signal being reflected back is handled to obtain the temperature for waiting for geodesic structure or dependent variable.
In above-mentioned aerospace fiber grating sensing system, the fiber Bragg grating (FBG) demodulator includes shell, circuit system and light Learn measuring system;Wherein, the circuit system and the optical measuring system may be contained in the shell;The circuit system It is connected with the optical measuring system, the light that the optical measuring system is sent out is transferred to the light by the transmission cable Fiber grating sensor is popped one's head in, and the fiber-optic grating sensor probe is anti-by the optical signal comprising the temperature or dependent variable that wait for geodesic structure Be emitted back towards the optical measuring system, the circuit system to the optical signal being reflected back handled to obtain the temperature for waiting for geodesic structure or Dependent variable.
In above-mentioned aerospace fiber grating sensing system, the circuit system include secondary power supply circuit and light path control and Signal acquisition processing circuit;Wherein, the secondary power supply circuit converts supply voltage, while receiving the control letter of external system Number and for controlling the switching on and shutting down of fiber Bragg grating (FBG) demodulator;The light path control and signal acquisition processing circuit are used to survey optics The control of amount system and electrical signal collection and processing obtain waiting for the temperature or dependent variable of geodesic structure.
In above-mentioned aerospace fiber grating sensing system, the optical measuring system includes light source, fiber coupler, spectrum Detection module, photoswitch, centre wavelength alignment unit and optical fiber connector;Wherein, the light source launches light source and passes through institute It states fiber coupler and is transferred to the photoswitch and centre wavelength alignment unit respectively;The centre wavelength alignment unit is according to it The wavelength of itself carries out real time calibration to the measured deviation of the optical measuring system;The photoswitch is to coming from the optical fiber coupling The spectrum of clutch carries out the time-sharing multiplex processing of interchannel, and spectral transmissions give the optical fiber connector by treated;It is described By treated, spectrum is transferred to the fiber-optic grating sensor probe to optical fiber connector by the Transmission Fibers;The optical fiber By treated, spectrum is converted to grating sensor probe comprising waiting for the temperature of geodesic structure or the optical signal of dependent variable and be reflected back The optical fiber connector, then photoswitch and coupler transfer are passed sequentially through to the spectral detection module;The spectral detection mould Block will carry out opto-electronic conversion comprising the optical signal for the temperature or dependent variable for waiting for geodesic structure and obtain electric signal.
In above-mentioned aerospace fiber grating sensing system, the secondary power supply circuit includes:Flouride-resistani acid phesphatase filter, Flouride-resistani acid phesphatase Power module and relay;Wherein, the Flouride-resistani acid phesphatase filter is filtered external power supply;The Flouride-resistani acid phesphatase power supply mould Block realizes the conversion of supply voltage;The relay receives external signal, realizes the switching on and shutting down control of the fiber Bragg grating (FBG) demodulator System.
In above-mentioned aerospace fiber grating sensing system, the light path control and signal acquisition processing circuit include:Anti- spoke According to fpga chip, Flouride-resistani acid phesphatase dsp chip, input signal conditioning circuit, analog to digital conversion circuit, communication interface circuit, Flouride-resistani acid phesphatase FPGA configures chip, Flouride-resistani acid phesphatase program storage, photoswitch driving circuit and wideband light source driving circuit;Wherein, the anti-spoke Control signal is provided for the spectral detection module according to fpga chip, the spectral detection module is the Flouride-resistani acid phesphatase fpga chip Answer signal is provided;Analog-digital conversion circuit as described is acquired the analog electrical signal of the spectral detection module, and will simulation Electric signal is converted to digital electric signal and is sent to the Flouride-resistani acid phesphatase fpga chip;The Flouride-resistani acid phesphatase fpga chip receives the mould The digital electric signal of number conversion circuit, after being pre-processed, is sent to the Flouride-resistani acid phesphatase dsp chip and carries out demodulation calculation process, And operation result is sent to external equipment by the communication interface circuit;The Flouride-resistani acid phesphatase FPGA configures chip in the light Configuration information is transferred to the Flouride-resistani acid phesphatase FPGA when road controls and signal acquisition processing circuit is powered;The Flouride-resistani acid phesphatase program is deposited Operating instruction is transferred to the Flouride-resistani acid phesphatase dsp chip by reservoir when the light path control and signal acquisition processing circuit are powered; The wideband light source driving circuit provides stable driving current and function of temperature control for the light source;The photoswitch driving circuit Drive control is carried out to the photoswitch, realizes the switching of path channels.
In above-mentioned aerospace fiber grating sensing system, the centre wavelength alignment unit includes:Center for standard ondometer Part and temperature sensor;Wherein, the center for standard wavelength device for the fiber Bragg grating (FBG) demodulator for providing in standard The long reference value of cardiac wave;The center for standard wavelength device is connected with the fiber coupler, so as to the optical measuring system The spectral measurement module receive the reflected light of the center for standard wavelength device, electric signal transmission is given through opto-electronic conversion The circuit system, the circuit system can calculate the centre wavelength measured value of the centre wavelength alignment unit, and by institute The centre wavelength measured value for stating center for standard wavelength device should have standard wave length's value to ask poor with it, and difference is used for the optical fiber light The compensation of grid (FBG) demodulator measured deviation;The temperature sensor is for monitoring the center for standard wavelength device temperature change and carrying For the centre wavelength reference value under different temperatures.
In above-mentioned aerospace fiber grating sensing system, the centre wavelength alignment unit is according to the wavelength of its own to institute State optical measuring system measured deviation carry out real time calibration include:The wavelength of the centre wavelength alignment unit reflected light is mark Quasi wave long value, the optical measuring system receive the reflected light of the centre wavelength alignment unit, through opto-electronic conversion by telecommunications It number is transferred to the circuit system, the circuit system can calculate the centre wavelength actual measurement of the centre wavelength alignment unit Value, and should there is standard wave length's value to ask poor with it centre wavelength measured value of centre wavelength alignment unit, difference is used for The compensation of the fiber Bragg grating (FBG) demodulator measured deviation.
According to another aspect of the present invention, a kind of aerospace optical fiber grating sensing method is additionally provided, is included the following steps: The light that fiber Bragg grating (FBG) demodulator is sent out is transferred to fiber-optic grating sensor probe by transmission cable;Fiber-optic grating sensor is popped one's head in It will be comprising waiting for that the temperature of geodesic structure or the optical signal of dependent variable be reflected back fiber Bragg grating (FBG) demodulator;Fiber Bragg grating (FBG) demodulator is to reflection The optical signal returned is handled to obtain the temperature for waiting for geodesic structure or dependent variable.
With in optical fiber grating sensing method, the fiber Bragg grating (FBG) demodulator includes shell, circuit system and light for above-mentioned aerospace Learn measuring system;Wherein, the circuit system and the optical measuring system may be contained in the shell;The circuit system It is connected with the optical measuring system, the light that the optical measuring system is sent out is transferred to the light by the transmission cable Fiber grating sensor is popped one's head in, and the fiber-optic grating sensor probe is anti-by the optical signal comprising the temperature or dependent variable that wait for geodesic structure Be emitted back towards the optical measuring system, the circuit system to the optical signal being reflected back handled to obtain the temperature for waiting for geodesic structure or Dependent variable.
Above-mentioned aerospace in optical fiber grating sensing method, the circuit system include secondary power supply circuit and light path control and Signal acquisition processing circuit;Wherein, the secondary power supply circuit converts supply voltage, while receiving the control letter of external system Number and for controlling the switching on and shutting down of fiber Bragg grating (FBG) demodulator;The light path control and signal acquisition processing circuit are used to survey optics The control of amount system and electrical signal collection and processing obtain waiting for the temperature or dependent variable of geodesic structure.
With in optical fiber grating sensing method, the optical measuring system includes light source, fiber coupler, spectrum for above-mentioned aerospace Detection module, photoswitch, centre wavelength alignment unit and optical fiber connector;Wherein, the light source launches light source and passes through institute It states fiber coupler and is transferred to the photoswitch and centre wavelength alignment unit respectively;The centre wavelength alignment unit is according to it The wavelength of itself carries out real time calibration to the measured deviation of the optical measuring system;The photoswitch is to coming from the optical fiber coupling The spectrum of clutch carries out the time-sharing multiplex processing of interchannel, and spectral transmissions give the optical fiber connector by treated;It is described By treated, spectrum is transferred to the fiber-optic grating sensor probe to optical fiber connector by the Transmission Fibers;The optical fiber By treated, spectrum is converted to grating sensor probe comprising waiting for the temperature of geodesic structure or the optical signal of dependent variable and be reflected back The optical fiber connector, then photoswitch and coupler transfer are passed sequentially through to the spectral detection module;The spectral detection mould Block will carry out opto-electronic conversion comprising the optical signal for the temperature or dependent variable for waiting for geodesic structure and obtain electric signal.
With in optical fiber grating sensing method, the secondary power supply circuit includes for above-mentioned aerospace:Flouride-resistani acid phesphatase filter, Flouride-resistani acid phesphatase Power module and relay;Wherein, the Flouride-resistani acid phesphatase filter is filtered external power supply;The Flouride-resistani acid phesphatase power supply mould Block realizes the conversion of supply voltage;The relay receives external signal, realizes the switching on and shutting down control of the fiber Bragg grating (FBG) demodulator System.
With in optical fiber grating sensing method, the light path control and signal acquisition processing circuit include for above-mentioned aerospace:Anti- spoke According to fpga chip, Flouride-resistani acid phesphatase dsp chip, input signal conditioning circuit, analog to digital conversion circuit, communication interface circuit, Flouride-resistani acid phesphatase FPGA configures chip, Flouride-resistani acid phesphatase program storage, photoswitch driving circuit and wideband light source driving circuit;Wherein, the anti-spoke Control signal is provided for the spectral detection module according to fpga chip, the spectral detection module is the Flouride-resistani acid phesphatase fpga chip Answer signal is provided;Analog-digital conversion circuit as described is acquired the analog electrical signal of the spectral detection module, and will simulation Electric signal is converted to digital electric signal and is sent to the Flouride-resistani acid phesphatase fpga chip;The Flouride-resistani acid phesphatase fpga chip receives the mould The digital electric signal of number conversion circuit, after being pre-processed, is sent to the Flouride-resistani acid phesphatase dsp chip and carries out demodulation calculation process, And operation result is sent to external equipment by the communication interface circuit;The Flouride-resistani acid phesphatase FPGA configures chip in the light Configuration information is transferred to the Flouride-resistani acid phesphatase FPGA when road controls and signal acquisition processing circuit is powered;The Flouride-resistani acid phesphatase program is deposited Operating instruction is transferred to the Flouride-resistani acid phesphatase dsp chip by reservoir when the light path control and signal acquisition processing circuit are powered; The wideband light source driving circuit provides stable driving current and function of temperature control for the light source;The photoswitch driving circuit Drive control is carried out to the photoswitch, realizes the switching of path channels.
With in optical fiber grating sensing method, the centre wavelength alignment unit includes for above-mentioned aerospace:Center for standard ondometer Part and temperature sensor;Wherein, the center for standard wavelength device for the fiber Bragg grating (FBG) demodulator for providing in standard The long reference value of cardiac wave;The center for standard wavelength device is connected with the fiber coupler so that the optical measuring system The spectral measurement module receive the reflected light of the center for standard wavelength device, electric signal transmission is given through opto-electronic conversion The circuit system, the circuit system can calculate the centre wavelength measured value of the centre wavelength alignment unit, and by institute The centre wavelength measured value for stating center for standard wavelength device should have standard wave length's value to ask poor with it, and difference is used for the optical fiber light The compensation of grid (FBG) demodulator measured deviation;The temperature sensor is for monitoring the center for standard wavelength device temperature change and carrying For the centre wavelength reference value under different temperatures.
The present invention has the advantages that compared with prior art:
(1) present invention solves the problems, such as the Flouride-resistani acid phesphatase that fiber grating sensing system is applied in aerospace environment.
(2) present invention uses centre wavelength alignment unit, carries out real time calibration to measuring drift caused by irradiation, makes optical fiber The measurement accuracy of grating sensing system has long-time stability.
Description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit are common for this field Technical staff will become clear.Attached drawing only for the purpose of illustrating preferred embodiments, and is not considered as to the present invention Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is the composition schematic diagram for the aerospace fiber grating sensing system that the embodiment of the present invention provides.
Specific implementation mode
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in attached drawing Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure Completely it is communicated to those skilled in the art.It should be noted that in the absence of conflict, embodiment in the present invention and Feature in embodiment can be combined with each other.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Fig. 1 is the composition schematic diagram for the aerospace fiber grating sensing system that the embodiment of the present invention provides.Such as Fig. 1 institutes Show, which includes with fiber grating sensing system:Fiber grating sensing system includes fiber Bragg grating (FBG) demodulator, fiber grating biography Sensor is popped one's head in and transmission cable.
Wherein, fiber Bragg grating (FBG) demodulator is made of shell structure, circuit system and optical measuring system.Shell structure is light The circuit system and optical measuring system of fine grating demodulation instrument, which provide, installs fixed structure, and plays bulk shielding irradiation, subtracts The effects that slow mechanics vibration, impact are influenced and are radiated.Circuit system includes that secondary power supply circuit and light path control and signal are adopted Collect processing circuit;Secondary power supply circuit is that the circuit system of fiber Bragg grating (FBG) demodulator realizes the conversion of supply voltage, receives simultaneously The control signal of external system, realizes the switching on and shutting down of optical fiber sensing system;Light path control and signal acquisition processing circuit, it can be achieved that Control and electrical signal collection, processing to the optical measuring system of fiber Bragg grating (FBG) demodulator, and measurement result is connect by communication Mouth is sent to external system.Optical measuring system includes wideband light source, fiber coupler, spectral detection module, photoswitch, center Wavelength calibration unit, optical fiber connector.
When external power supply and control interface control aerospace fiber grating sensing system booting work, fiber Bragg grating (FBG) demodulator Light path control and signal acquisition processing circuit start, control (FBG) demodulator in optical measuring system it is anti-to fiber-optic grating sensor The optical measurement signal penetrated carries out opto-electronic conversion, and by transformed electric signal transmission to the light path control of fiber Bragg grating (FBG) demodulator And signal acquisition processing circuit carries out demodulation calculation process, and by demodulation result by communications interface transmission to external equipment.For Ensure the long-time stability of demodulation result precision, centre wavelength alignment unit is devised in fiber Bragg grating (FBG) demodulator, irradiation is drawn The measurement drift risen carries out real time calibration;And popped one's head in using the fiber-optic grating sensor of Flouride-resistani acid phesphatase, reduce irradiation influences on measuring.
Wideband light source provides light source for the optical measuring system.
Fiber coupler is allocated the luminous power from the wideband light source, is transferred to the photoswitch respectively in The long alignment unit of cardiac wave.
Centre wavelength alignment unit carries out real time calibration to the measured deviation of optical measuring system.Centre wavelength alignment unit The wavelength of reflected light is standard wave length's value, and the optical measuring system receives the reflected light of the centre wavelength alignment unit, Give the circuit system, the circuit system that can calculate the centre wavelength alignment unit electric signal transmission through opto-electronic conversion Centre wavelength measured value, and should there is standard wave length's value to ask with it centre wavelength measured value of centre wavelength alignment unit Difference is used for the compensation of the fiber Bragg grating (FBG) demodulator measured deviation by difference.
The time-sharing multiplex that photoswitch carries out the spectrum from the fiber coupler interchannel is handled, and by treated Spectral transmissions give the optical fiber connector.
Optical fiber connector further pops one's head in spectral transmissions to the Transmission Fibers and fiber-optic grating sensor.
Spectral detection module is used to carry out opto-electronic conversion to the spectral signal that fiber-optic grating sensor probe is reflected back.
The optical signal transmission that transmission cable is popped one's head in for realizing the fiber Bragg grating (FBG) demodulator and fiber-optic grating sensor.
Fiber-optic grating sensor probe is used to measure the temperature or dependent variable for waiting for geodesic structure, and by measurement result described in Transmission cable is transmitted back to the fiber grating demodulation view and is handled.
Specifically, centre wavelength alignment unit includes:Center for standard wavelength device and temperature sensor;Wherein, the mark True centric wavelength device is used to provide the centre wavelength reference value of standard for the fiber Bragg grating (FBG) demodulator;The center for standard wave Long device is connected with the fiber coupler so that the spectral measurement module of the optical measuring system receives described The reflected light of center for standard wavelength device gives electric signal transmission to the circuit system, the circuit system meeting through opto-electronic conversion Calculate the centre wavelength measured value of the centre wavelength alignment unit, and by the centre wavelength of the center for standard wavelength device Measured value should have standard wave length's value to ask poor with it, and difference is used for the compensation of the fiber Bragg grating (FBG) demodulator measured deviation;It is described Temperature sensor is for monitoring the center for standard wavelength device temperature change and providing the reference of the centre wavelength under different temperatures Value.
Specifically, secondary power supply circuit includes:Flouride-resistani acid phesphatase filter, Flouride-resistani acid phesphatase power module, relay.Flouride-resistani acid phesphatase filters Device is filtered external power supply;Flouride-resistani acid phesphatase power module realizes the conversion of supply voltage;Relay receives external signal, Realize the switching on and shutting down control of fiber Bragg grating (FBG) demodulator.
Specifically, light path control and signal acquisition processing circuit include:It is Flouride-resistani acid phesphatase fpga chip, Flouride-resistani acid phesphatase dsp chip, defeated Enter signal conditioning circuit, analog to digital conversion circuit, communication interface circuit, Flouride-resistani acid phesphatase FPGA configuration chip, Flouride-resistani acid phesphatase program storage, Photoswitch driving circuit and wideband light source driving circuit.
Flouride-resistani acid phesphatase fpga chip provides control signal for the spectral detection module, and the spectral detection module is described anti- It irradiates fpga chip and answer signal is provided.
Analog to digital conversion circuit is acquired the analog electrical signal of the spectral detection module, and analog electrical signal is converted It is sent to Flouride-resistani acid phesphatase fpga chip for digital electric signal.
Flouride-resistani acid phesphatase fpga chip receives the digital electric signal of analog to digital conversion circuit, after being pre-processed, is sent to anti-spoke Demodulation calculation process is carried out according to dsp chip, and operation result is sent to external equipment by the communication interface circuit.
Configuration information is transferred to by Flouride-resistani acid phesphatase FPGA configuration chips when light path control and signal acquisition processing circuit are powered Flouride-resistani acid phesphatase FPGA.
Flouride-resistani acid phesphatase program storage will run program transportation when light path control and signal acquisition processing circuit are powered to anti- Irradiate dsp chip.
Wideband light source driving circuit provides stable driving current and function of temperature control for wideband light source.
Photoswitch driving circuit carries out drive control to photoswitch, realizes the switching of path channels.
Centre wavelength alignment unit includes:Center for standard wavelength device, temperature sensor, fiber grating.Wherein, the mark True centric wavelength device is used to provide the centre wavelength reference value of standard for the fiber Bragg grating (FBG) demodulator;The temperature sensor For monitoring the centre wavelength alignment unit temperature change, to carry out temperature-compensating;The fiber grating is for carrying out reality Border measures wavelength reference.
Preferably, fiber coupler is 3dB fiber couplers.
Preferably, spectral measurement module includes diffraction grating and detector array, can measure wave-length coverage more than 40nm's Spectrum.
Fiber-optic grating sensor probe includes fiber grating and encapsulating structure.Wherein, fiber grating is using certain material, work Prepared by skill, so that the fiber grating has radiation-resisting performance;Encapsulating structure uses high density material, further decreases irradiation pair The influence of the fiber grating.
External power supply and the secondary power supply circuit that control interface is aerospace fiber grating sensing system are powered, and aerospace is used up Fine grating sensing system booting work.The light path control and signal acquisition processing circuit of fiber Bragg grating (FBG) demodulator start, light path control System and signal acquisition processing circuit control light source emit optical signals, and optical signal is assigned to centre wavelength school through fiber coupler Quasi- unit and photoswitch.Optical signal with calibration information is fed back to spectrum through fiber coupler and surveyed by centre wavelength alignment unit Measure module.Optical signal is assigned to through photoswitch on the different Measurement channels of optical fiber connector, optical fiber connector with carry optical fiber The transmission cable of grating sensor probe is connected, and fiber-optic grating sensor is popped one's head in after sense temperature or strain information, will carry temperature The optical signal of degree or strain information feeds back to spectral measurement mould along transmission cable, optical fiber connector, photoswitch, fiber coupler Block.Spectral measurement module carries out opto-electronic conversion to the optical signal of fiber-optic grating sensor probe reflection, then by transformed electricity Signal transmission carries out demodulation calculation process to the light path control and signal acquisition processing circuit of fiber Bragg grating (FBG) demodulator.Light path control And signal acquisition processing circuit by demodulation result by communications interface transmission to external equipment.To ensure the length of demodulation result precision Phase stability devises centre wavelength alignment unit in fiber Bragg grating (FBG) demodulator, to measured caused by irradiation drift carry out it is real-time Calibration;And popped one's head in using the fiber-optic grating sensor of Flouride-resistani acid phesphatase, reduce irradiation influences on measuring.
The present embodiment additionally provides a kind of aerospace optical fiber grating sensing method, the described method comprises the following steps:Optical fiber The light that grating demodulation instrument is sent out is transferred to fiber-optic grating sensor probe by transmission cable;Fiber-optic grating sensor probe will packet Containing waiting for that the temperature of geodesic structure or the optical signal of dependent variable be reflected back fiber Bragg grating (FBG) demodulator;Fiber Bragg grating (FBG) demodulator is to being reflected back Optical signal is handled to obtain the temperature for waiting for geodesic structure or dependent variable.
The present embodiment uses the electronic component of Flouride-resistani acid phesphatase, enables the circuit of fiber grating sensing system in radiation environment Medium-term and long-term steady operation.
Embodiment described above is the present invention more preferably specific implementation mode, and those skilled in the art is in this hair The usual variations and alternatives carried out in bright technical proposal scope should be all included within the scope of the present invention.

Claims (10)

1. a kind of aerospace fiber grating sensing system, it is characterised in that including:Fiber Bragg grating (FBG) demodulator, fiber-optic grating sensor Probe and transmission cable;Wherein,
The light that the fiber Bragg grating (FBG) demodulator is sent out is transferred to the fiber-optic grating sensor by the transmission cable and pops one's head in, institute Stating fiber-optic grating sensor probe will be comprising waiting for that the temperature of geodesic structure or the optical signal of dependent variable be reflected back the fiber grating solution Instrument, the fiber Bragg grating (FBG) demodulator is adjusted to be handled the optical signal being reflected back to obtain the temperature for waiting for geodesic structure or dependent variable.
2. aerospace fiber grating sensing system according to claim 1, it is characterised in that:The fiber Bragg grating (FBG) demodulator Including shell, circuit system and optical measuring system;Wherein,
The circuit system and the optical measuring system may be contained in the shell;
The circuit system is connected with the optical measuring system, and the light that the optical measuring system is sent out passes through the transmission Optical cable transmission gives fiber-optic grating sensor probe, fiber-optic grating sensor probe by comprising the temperature for waiting for geodesic structure or The optical signal of dependent variable is reflected back the optical measuring system, and the circuit system is handled to obtain to the optical signal being reflected back Wait for the temperature or dependent variable of geodesic structure.
3. aerospace fiber grating sensing system according to claim 2, it is characterised in that:The circuit system includes two Secondary source circuit and light path control and signal acquisition processing circuit;Wherein,
The secondary power supply circuit converts supply voltage, while receiving the control signal of external system and being used to control optical fiber light The switching on and shutting down of grid (FBG) demodulator;
The light path control and signal acquisition processing circuit are used for the control of optical measuring system and electrical signal collection and processing Obtain waiting for the temperature or dependent variable of geodesic structure.
4. aerospace fiber grating sensing system according to claim 3, it is characterised in that:The optical measuring system packet Include light source, fiber coupler, spectral detection module, photoswitch, centre wavelength alignment unit and optical fiber connector;Wherein,
The light source launches light source and is transferred to the photoswitch and centre wavelength calibration respectively by the fiber coupler Unit;
The centre wavelength alignment unit carries out the measured deviation of the optical measuring system according to the wavelength of its own real-time Calibration;
The time-sharing multiplex that the photoswitch carries out the spectrum from the fiber coupler interchannel is handled, and by treated Spectral transmissions give the optical fiber connector;
By treated, spectrum is transferred to the fiber-optic grating sensor probe to the optical fiber connector by the Transmission Fibers;
By treated, spectrum is converted to the light for including the temperature or dependent variable for waiting for geodesic structure to the fiber-optic grating sensor probe Signal is simultaneously reflected back the optical fiber connector, then passes sequentially through photoswitch and coupler transfer to the spectral detection module;
The spectral detection module will carry out opto-electronic conversion comprising the optical signal for the temperature or dependent variable for waiting for geodesic structure and obtain telecommunications Number.
5. aerospace fiber grating sensing system according to claim 3, it is characterised in that:The secondary power supply circuit packet It includes:Flouride-resistani acid phesphatase filter, Flouride-resistani acid phesphatase power module and relay;Wherein, the Flouride-resistani acid phesphatase filter filters external power supply Wave processing;The Flouride-resistani acid phesphatase power module realizes the conversion of supply voltage;The relay receives external signal, realizes the light The switching on and shutting down of fine grating demodulation instrument control.
6. aerospace fiber grating sensing system according to claim 4, it is characterised in that:The light path control and signal Acquisition process circuit includes:Flouride-resistani acid phesphatase fpga chip, Flouride-resistani acid phesphatase dsp chip, input signal conditioning circuit, analog to digital conversion circuit, Communication interface circuit, Flouride-resistani acid phesphatase FPGA configurations chip, Flouride-resistani acid phesphatase program storage, photoswitch driving circuit and wideband light source driving Circuit;Wherein, the Flouride-resistani acid phesphatase fpga chip provides control signal for the spectral detection module, and the spectral detection module is The Flouride-resistani acid phesphatase fpga chip provides answer signal;Analog electrical signal of the analog-digital conversion circuit as described to the spectral detection module It is acquired, and analog electrical signal is converted into digital electric signal and is sent to the Flouride-resistani acid phesphatase fpga chip;The Flouride-resistani acid phesphatase Fpga chip receives the digital electric signal of analog-digital conversion circuit as described, after being pre-processed, is sent to the Flouride-resistani acid phesphatase DSP cores Piece carries out demodulation calculation process, and operation result is sent to external equipment by the communication interface circuit;The Flouride-resistani acid phesphatase FPGA configures chip and configuration information is transferred to the Flouride-resistani acid phesphatase when the light path control and signal acquisition processing circuit are powered FPGA;The Flouride-resistani acid phesphatase program storage transmits operating instruction when the light path control and signal acquisition processing circuit are powered To the Flouride-resistani acid phesphatase dsp chip;The wideband light source driving circuit provides stable driving current and temperature control work(for the light source Energy;The photoswitch driving circuit carries out drive control to the photoswitch, realizes the switching of path channels.
7. aerospace fiber grating sensing system according to claim 4, it is characterised in that:The centre wavelength calibration is single Member includes:Center for standard wavelength device and temperature sensor;Wherein, the center for standard wavelength device is used to be the optical fiber light Grid (FBG) demodulator provides the centre wavelength reference value of standard;The center for standard wavelength device is connected with the fiber coupler, So that the spectral measurement module of the optical measuring system receives the reflected light of the center for standard wavelength device, through light Electric signal transmission is given the circuit system, the circuit system that can calculate in the centre wavelength alignment unit by electricity conversion The long measured value of cardiac wave, and should there is standard wave length's value to ask poor with it centre wavelength measured value of center for standard wavelength device, Difference is used for the compensation of the fiber Bragg grating (FBG) demodulator measured deviation;The temperature sensor is for monitoring the center for standard Wavelength device temperature change simultaneously provides the centre wavelength reference value under different temperatures.
8. aerospace fiber grating sensing system according to claim 4, it is characterised in that:The centre wavelength calibration is single Member carries out real time calibration according to the wavelength of its own to the measured deviation of the optical measuring system:The centre wavelength school The wavelength of quasi- unit reflected light is standard wave length's value, and the optical measuring system receives the anti-of the centre wavelength alignment unit Light is penetrated, gives the circuit system, the circuit system that can calculate the centre wavelength school electric signal transmission through opto-electronic conversion The centre wavelength measured value of quasi- unit, and the centre wavelength measured value of the centre wavelength alignment unit should be had into standard wave with it Long value asks poor, and difference is used for the compensation of the fiber Bragg grating (FBG) demodulator measured deviation.
9. a kind of aerospace optical fiber grating sensing method, it is characterised in that include the following steps:
The light that fiber Bragg grating (FBG) demodulator is sent out is transferred to fiber-optic grating sensor probe by transmission cable;
Fiber-optic grating sensor probe will be comprising waiting for that the temperature of geodesic structure or the optical signal of dependent variable be reflected back fiber grating demodulation Instrument;
Fiber Bragg grating (FBG) demodulator handles the optical signal being reflected back to obtain the temperature for waiting for geodesic structure or dependent variable.
10. aerospace according to claim 9 optical fiber grating sensing method, it is characterised in that:The fiber grating demodulation Instrument includes shell, circuit system and optical measuring system;Wherein,
The circuit system and the optical measuring system may be contained in the shell;
The circuit system is connected with the optical measuring system, and the light that the optical measuring system is sent out passes through the transmission Optical cable transmission gives fiber-optic grating sensor probe, fiber-optic grating sensor probe by comprising the temperature for waiting for geodesic structure or The optical signal of dependent variable is reflected back the optical measuring system, and the circuit system is handled to obtain to the optical signal being reflected back Wait for the temperature or dependent variable of geodesic structure.
CN201711420701.0A 2017-12-25 2017-12-25 Aerospace fiber grating sensing system and method Pending CN108398144A (en)

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