CN105783951A - Multichannel fiber bragg grating demodulation instrument - Google Patents
Multichannel fiber bragg grating demodulation instrument Download PDFInfo
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- CN105783951A CN105783951A CN201410800897.6A CN201410800897A CN105783951A CN 105783951 A CN105783951 A CN 105783951A CN 201410800897 A CN201410800897 A CN 201410800897A CN 105783951 A CN105783951 A CN 105783951A
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Abstract
The utility model discloses a multichannel fiber bragg grating demodulation instrument. The multichannel fiber bragg grating demodulation instrument comprises an optical path unit and a circuit unit; the optical path unit comprises a broadband light source, an adjustable F-P filter, an optical branching device and a fiber bragg grating sensing module connected in series sequentially by optical fibers; the circuit unit comprises a power source module, a photoelectric detector module, a data acquisition module, an amplification circuit module, an upper computer and a driving circuit module; the power source module is connected with the broadband light source, the adjustable F-P filter, the driving circuit module, the amplification circuit module and the data acquisition module; the photoelectric detector module, the amplification circuit module, the data acquisition module and the driving circuit module are connected in sequence; the data acquisition module is connected with the upper computer; and the photoelectric detector module receives a reflection optical signal of the fiber bragg grating sensing module and converts the signal to an electric signal, and transmits the electric signal to the amplification circuit module. The demodulation instrument has the advantages of simple operation, large use dynamic range, stable performance and the like.
Description
Technical field
The present invention relates to fiber grating demodulation technical field, particularly relate to a kind of multi-channel fiber Bragg grating (FBG) demodulator.
Background technology
Fiber grating be development in recent years the most rapidly, one of the optical passive component that is most widely used.Fiber Bragg Grating FBG (be called for short FBG) is except having Fibre Optical Sensor good reliability, electromagnetism interference, the feature such as anticorrosive, the multiplex techniques such as wavelength-division, time-division, space division can also be utilized, it is achieved the quasi-distributed multimetering of the sensing amounts such as counter stress, temperature, electromagnetic field.Information measured, as wavelength-modulated type sensor, is converted into the movement of Bragg grating centre wavelength by Fiber Bragg Grating FBG, by demodulating centre wavelength drift from the optical signal recorded, so that it may realize the measurement to information measured.
Compared with traditional sensor, the application of high-resolution, high-precision digital optical fiber grating sensor (FiberBraggGating, FBG) is convenient, and is more suitable for working under rugged environment.It has been obtained for research widely and application at present, has considerable application prospect in the stress health structure detection in the fields such as colliery country rock, top board, Aero-Space, dam bridge, high-intensity magnetic field detection etc..
In order to realize measured high-acruracy survey. there has been proposed many demodulation methods to detect the minor variations of FBG centre wavelength. have than more typical: matched fiber grating filter method, tunable F P filter method, dispersion demodulation method, non-equilibrium M Z fibre optic interferometer demodulation method etc..Wherein, tunable fiber F-P filter method is at present application comparatively successfully one of demodulation method, has that high sensitivity, the efficiency of light energy utilization be high, simple to operate, tuning range width and an advantage such as system stability is good, is suitable to the wavelength shift monitoring technology of engineer applied.Grating fibers (FBG) demodulator general precision based on tunable TEA CO2 laser is relatively low in the market, and port number is less, and the quantity of accessible fiber-optic grating sensor is few and cannot realize the demodulation of multichannel real-time high-precision.
Summary of the invention
What present invention mainly solves technical problem is that existing fiber Bragg grating (FBG) demodulator cannot realize multichannel and implement high accuracy demodulation, a kind of multi-channel fiber Bragg grating (FBG) demodulator is provided, multichannel fibre-optical grating sensor system is carried out parallel, real-time, high-accuracy wavelength demodulation, and use dynamic range big, stable performance.
For solving above-mentioned technical problem, the technical scheme that the present invention adopts is: a kind of multi-channel fiber Bragg grating (FBG) demodulator, including optical path unit and circuit unit, described optical path unit includes the wideband light source being sequentially connected in series by optical fiber, adjustable F-P wave filter, optical branching device and optical fiber grating sensing module；Described circuit unit includes power module, photodetector module, data acquisition module, amplification circuit module, host computer and drive circuit module；Described power module is connected with described wideband light source, described adjustable F-P wave filter, described drive circuit module, described amplification circuit module and described data acquisition module respectively, and described photodetector module, described amplification circuit module, described data acquisition module and described drive circuit module are sequentially connected；Described data acquisition module is connected with described host computer；Wherein, described photodetector module receives the reflected light signal of described fiber grating sensor module and is converted to the signal of telecommunication and is transferred to described amplification circuit module.
Preferably, the quantity of described fiber grating sensor module is four, is each mutually in step work, and each described fiber grating sensor module includes 16 fiber-optic grating sensor groups.
Preferably, the quantity of described photodetector module is four groups, and one_to_one corresponding is in four described fiber grating sensor modules respectively；Often organizing described photodetector module and include 16 photodetectors, one_to_one corresponding is in 16 described fiber-optic grating sensor groups respectively；Described photodetector is InGaAs(indium gallium arsenic) photodiode.
Preferably, the quantity of described amplification circuit module is four, and one_to_one corresponding is in four described photodetector module respectively.
Preferably, the quantity of described data acquisition module is four, and one_to_one corresponding is in four described amplification circuit module respectively.
Preferably, described data acquisition module includes ARM or FPGA microprocessor, and described ARM or FPGA microprocessor output pulse control signal starts described drive circuit module control described adjustable F-P wave filter and the spectral signal of described wideband light source is carried out frequency sweep.
Preferably, the quantity of described optical branching device is four, and one_to_one corresponding is in four described fiber grating sensor modules respectively；Each described optical branching device is 1 × 16 multichannel optical fiber bonder.
Preferably, described optical branching device is 3dB fiber coupler.
Preferably, the supply voltage of described power module is 5V and 12V.
Preferably, the narrow-band spectrum of described adjustable F-P wave filter is less than 0.3nm.
The invention has the beneficial effects as follows: be different from the situation of prior art, the light that the wideband light source of the multi-channel fiber Bragg grating (FBG) demodulator of the present invention sends passes through adjustable F-P wave filter, again through optical branching device, each passage sensing grating is carried out synchronous scanning from adjustable F-P wave filter transmission light out, when being there is wavelength shift by outer signals modulation is lower in grating signal, the centre wavelength of the optical grating reflection of different bands will not overlap each other, when the centre wavelength at adjustable F-P filter transmission peak is equal with the centre wavelength of sensing grating reflection peak, the magnitude of voltage being carried out opto-electronic conversion by photodetector group again is maximum, then it is transferred to data acquisition module after amplified circuit module filter and amplification and demodulates measured signal, finally demodulation signal is transferred in host computer and shows.The present invention can be implemented in C-band and independently monitors up to a hundred fiber-optic grating sensor passages, thus multichannel fibre-optical grating sensor system being carried out the demodulation of parallel, real-time, high-accuracy wavelength, have easy and simple to handle, use dynamic range big and the feature such as stable performance.
Accompanying drawing explanation
Fig. 1 is the structural representation of multi-channel fiber Bragg grating (FBG) demodulator of the present invention.
Detailed description of the invention
Refer to Fig. 1, a kind of multi-channel fiber Bragg grating (FBG) demodulator of one embodiment of the invention, including optical path unit 1 and circuit unit 2, optical path unit 1 includes the wideband light source 101 being sequentially connected in series by optical fiber, adjustable F-P wave filter 102, optical branching device 103 and fiber grating sensor module 104；Circuit unit 2 includes power module 201, photodetector module 202, data acquisition module 203, amplification circuit module 204, host computer 205 and drive circuit module 206；Power module 201 is connected with wideband light source 101, adjustable F-P wave filter 102, drive circuit module 206, amplification circuit module 204 and data acquisition module 203 respectively, and photodetector module 202, amplification circuit module 204, data acquisition module 203 and drive circuit module 206 are sequentially connected；Data acquisition module 203 is connected with host computer 205.Wherein, photodetector module 202 receives the reflected light signal of fiber grating sensor module 104 and is converted to the signal of telecommunication and is transferred to amplification circuit module 204.
In the present invention, the quantity of fiber grating sensor module is four ((only listing one in FIG), is each mutually in step work；Each fiber grating sensor module can connect 16 fiber-optic grating sensor link 10401-10416, as shown in Figure 1.
In the present invention, the quantity of photodetector module 202 is also four groups (only listing one group in FIG), and one_to_one corresponding is in four fiber grating sensor modules 104 respectively；Often group photoelectric detection module 202 includes 16 photodetector 20201-20216, and one_to_one corresponding is in 16 fiber-optic grating sensor group 10401-10416 respectively；What photodetector adopted is InGaAs(indium gallium arsenic) photodiode.
In the present invention, the quantity of amplification circuit module 204 is four (only listing one in FIG), and one_to_one corresponding is in four groups of photodetector module 202 respectively.
In the present invention, the quantity of data acquisition module 203 is four (only listing one in FIG), and one_to_one corresponding is in four amplification circuit module 204 respectively.
Wherein, data acquisition module 203 includes ARM or FPGA microprocessor (not showing in Fig. 1), ARM or FPGA microprocessor output pulse control signal startup drive circuit module 206 controls the adjustable F-P wave filter 102 spectral signal to wideband light source 101 and carries out frequency sweep.
In the present invention, optical branching device 103 is 3dB fiber coupler.The quantity of optical branching device 103 is four (only listing one in FIG), and one_to_one corresponding is in four fiber grating sensor modules 104 respectively；Each optical branching device 103 is 1 × 16 multichannel optical fiber bonder.
In the present invention, the supply voltage of power module 201 is 5V and 12V, respectively adjustable F-P wave filter 102, drive circuit module 206, amplification circuit module 204 and data acquisition module 203 is powered.
The operation principle of the multi-channel fiber Bragg grating (FBG) demodulator of the present invention is as follows:
Adjustable F-P wave filter 102 is equivalent to a narrow band filter, and in the present invention, the narrow-band spectrum of adjustable F-P wave filter 102 is less than 0.3nm.The elongation of F-P cavity chamber length is directly proportional to added driving voltage, when in data acquisition module 203, the piezoelectrics in adjustable F-P wave filter 102 are applied a sawtooth sweep voltage by ARM or FPGA microprocessor control drive circuit module 206, generation is stretched by piezoelectrics, the chamber length of F-P cavity changes, and then makes the transmitted light wave length of F-P cavity change.Transmission center wavelength of light corresponding to different scanning voltages is different, thus makes the light pulse of the different centre wavelengths that multiple fiber-optic grating sensor group 104 reflects at synchronization.If the reflection at peak of the transmission crest of F-P cavity and fiber-optic grating sensor group 104 is met, the transmitted light intensity that corresponding photodetector group 202 detects reaches maximum, transmission light is converted into the digital electric signal of amplification through photodetector group 202 and amplification circuit module 204, enter and data acquisition module 203 carries out data acquisition, data process and peakvalue's checking, corresponding relation according to wavelength Yu voltage, adopt certain algorithm, so that it may draw, by the magnitude of voltage recorded, the wavelength value that fiber-optic grating sensor group 104 feeds back to.
Please continue to refer to Fig. 1, the work process of the multi-channel fiber Bragg grating (FBG) demodulator of the present invention is as follows:
As shown in Figure 1, the incident adjustable F-P wave filter 102 of wideband light source 101, adjustable F-P wave filter 102 is under the driving of the sawtooth sweep voltage of drive circuit module 206, the narrow band light of outgoing continuous print difference centre wavelength, narrow band light splits the light into the fiber-optic grating sensor group 104 of four 16 passages by four 1 × 16 optical branching devices 103.The narrow band light scanning fiber bragg grating sensor group 10401-10416 that adjustable F-P wave filter 102 is launched, when the centre wavelength of narrow band light and the Bragg reflection centre wavelength of fiber-optic grating sensor group 104 are identical, the optical signal of photodetector group 202 detection is the strongest, the voltage of opto-electronic conversion is maximum, the electrical signal voltage obtained through photodetector group 202 opto-electronic conversion is through the amplification of amplification circuit module 204, after filtering and shaping, data acquisition again through data acquisition module 203, peakvalue's checking and data process, the corresponding relation of the scanning voltage according to adjustable F-P wave filter 102 and its transmission center wavelength of light just can demodulate the wavelength of each fiber grating.The data result of each fiber grating sensor module 104 is finally got forwarded in host computer 205 by data wire and form to compose shape figure shows on host computer 205.The pressure suffered from when fiber grating sensor module 104 or when varying more than preset value of temperature and strain etc., the multichannel grating optical fibre interrogation instrument of the present invention will be reported to the police, and can pinpoint the problems intuitively place solving a problem promptly by composing shape figure.
The invention has the beneficial effects as follows: be different from the situation of prior art, the light that wideband light source is sent by the multi-channel fiber Bragg grating (FBG) demodulator of the present invention passes through adjustable F-P wave filter, from adjustable F-P wave filter transmission light out again through the optical branching device sensing grating synchronous scanning to each passage of optical fibre optical grating sensing array, when being there is wavelength shift by outer signals modulation is lower in grating signal, the centre wavelength of the optical grating reflection of different bands will not overlap each other, when the centre wavelength at adjustable F-P filter transmission peak is equal with the centre wavelength of sensing grating reflection peak, the magnitude of voltage being carried out opto-electronic conversion by photodetector group again is maximum, then it is transferred to data acquisition module after amplified circuit module filter and amplification and demodulates measured signal, finally demodulation signal is transferred in host computer and shows.The present invention can be implemented in C-band and independently monitors up to a hundred fiber-optic grating sensor passages, thus multichannel fibre-optical grating sensor system being carried out the demodulation of parallel, real-time, high-accuracy wavelength, have easy and simple to handle, use dynamic range big and the feature such as stable performance.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure utilizing description of the present invention and accompanying drawing content to make or equivalence flow process conversion; or directly or indirectly it is used in other relevant technical fields, all in like manner include in the scope of patent protection of the present invention.
Claims (10)
1. a multi-channel fiber Bragg grating (FBG) demodulator, it is characterised in that include optical path unit and circuit unit, described optical path unit includes the wideband light source being sequentially connected in series by optical fiber, adjustable F-P wave filter, optical branching device and optical fiber grating sensing module；Described circuit unit includes power module, photodetector module, data acquisition module, amplification circuit module, host computer and drive circuit module；Described power module is connected with described wideband light source, described adjustable F-P wave filter, described drive circuit module, described amplification circuit module and described data acquisition module respectively, and described photodetector module, described amplification circuit module, described data acquisition module and described drive circuit module are sequentially connected；Described data acquisition module is connected with described host computer；Wherein, described photodetector module receives the reflected light signal of described fiber grating sensor module and is converted to the signal of telecommunication and is transferred to described amplification circuit module.
2. multi-channel fiber Bragg grating (FBG) demodulator according to claim 1, it is characterised in that the quantity of described fiber grating sensor module is four, is each independently of the others work, and each described fiber grating sensor module includes 16 fiber-optic grating sensor groups.
3. multi-channel fiber Bragg grating (FBG) demodulator according to claim 2, it is characterised in that the quantity of described photodetector module is four, one_to_one corresponding is in four described fiber grating sensor modules respectively；Each described photodetector module includes 16 photodetectors, and one_to_one corresponding is in 16 described fiber-optic grating sensor groups respectively；Described photodetector is InGaAs(indium gallium arsenic) photodiode.
4. multi-channel fiber Bragg grating (FBG) demodulator according to claim 3, it is characterised in that the quantity of described amplification circuit module is four, one_to_one corresponding is in four described photodetector module respectively.
5. multi-channel fiber Bragg grating (FBG) demodulator according to claim 4, it is characterised in that the quantity of described data acquisition module is four, one_to_one corresponding is in four described amplification circuit module respectively.
6. multi-channel fiber Bragg grating (FBG) demodulator according to claim 5, it is characterized in that, described data acquisition module includes ARM or FPGA microprocessor, and described ARM or FPGA microprocessor output pulse control signal starts described drive circuit module control described adjustable F-P wave filter and the spectral signal of described wideband light source is carried out frequency sweep.
7. multi-channel fiber Bragg grating (FBG) demodulator according to claim 2, it is characterised in that the quantity of described optical branching device is four, one_to_one corresponding is in four described fiber grating sensor modules respectively；Each described optical branching device is 1 × 16 multichannel optical fiber bonder.
8. multi-channel fiber Bragg grating (FBG) demodulator according to claim 7, it is characterised in that described optical branching device is 3dB fiber coupler.
9. multi-channel fiber Bragg grating (FBG) demodulator according to claim 1, it is characterised in that the supply voltage of described power module is 5V and 12V.
10. multi-channel fiber Bragg grating (FBG) demodulator according to claim 1, it is characterised in that the narrow-band spectrum of described adjustable F-P wave filter is less than 0.3nm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106706011A (en) * | 2016-12-27 | 2017-05-24 | 北京航空航天大学 | Method for filtering out pulse noise wave in demodulation of fiber Bragg grating sensor |
| CN107271085A (en) * | 2017-06-26 | 2017-10-20 | 北京航空航天大学 | A kind of stress detector implementation method based on fiber-optic grating sensor |
| CN107300394A (en) * | 2017-05-31 | 2017-10-27 | 北京航空航天大学 | The implementation method of fiber-optic grating sensor hardware demodulation system based on FPGA and ARM |
| CN108051019A (en) * | 2017-12-08 | 2018-05-18 | 北京卫星信息工程研究所 | At a high speed, the spaceborne mini optical fibre grating demodulation device of multichannel and demodulation method |
| CN109798925A (en) * | 2019-01-15 | 2019-05-24 | 太原理工大学 | A kind of adjustable matched FBG demodulating equipment of range |
| CN111323061A (en) * | 2020-03-25 | 2020-06-23 | 中国科学院声学研究所东海研究站 | Disposable optical fiber depth thermometer measuring system |
| CN111780790A (en) * | 2020-06-03 | 2020-10-16 | 华南师范大学 | Device and method for demodulating dense fiber bragg grating array |
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2014
- 2014-12-22 CN CN201410800897.6A patent/CN105783951A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706011A (en) * | 2016-12-27 | 2017-05-24 | 北京航空航天大学 | Method for filtering out pulse noise wave in demodulation of fiber Bragg grating sensor |
| CN106706011B (en) * | 2016-12-27 | 2018-12-28 | 北京航空航天大学 | A method of filtering out impulsive noise signal in fiber Bragg grating sensor demodulation |
| CN107300394A (en) * | 2017-05-31 | 2017-10-27 | 北京航空航天大学 | The implementation method of fiber-optic grating sensor hardware demodulation system based on FPGA and ARM |
| CN107271085A (en) * | 2017-06-26 | 2017-10-20 | 北京航空航天大学 | A kind of stress detector implementation method based on fiber-optic grating sensor |
| CN108051019A (en) * | 2017-12-08 | 2018-05-18 | 北京卫星信息工程研究所 | At a high speed, the spaceborne mini optical fibre grating demodulation device of multichannel and demodulation method |
| CN108051019B (en) * | 2017-12-08 | 2020-07-31 | 北京卫星信息工程研究所 | High-speed multi-channel satellite-borne micro fiber bragg grating demodulation device and demodulation method |
| CN109798925A (en) * | 2019-01-15 | 2019-05-24 | 太原理工大学 | A kind of adjustable matched FBG demodulating equipment of range |
| CN109798925B (en) * | 2019-01-15 | 2021-01-19 | 太原理工大学 | Range-adjustable matched grating demodulation device |
| CN111323061A (en) * | 2020-03-25 | 2020-06-23 | 中国科学院声学研究所东海研究站 | Disposable optical fiber depth thermometer measuring system |
| CN111780790A (en) * | 2020-06-03 | 2020-10-16 | 华南师范大学 | Device and method for demodulating dense fiber bragg grating array |
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Application publication date: 20160720 |