CN204555996U - A kind of fiber grating demodulation device based on volume holographic grating - Google Patents
A kind of fiber grating demodulation device based on volume holographic grating Download PDFInfo
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- CN204555996U CN204555996U CN201420771059.6U CN201420771059U CN204555996U CN 204555996 U CN204555996 U CN 204555996U CN 201420771059 U CN201420771059 U CN 201420771059U CN 204555996 U CN204555996 U CN 204555996U
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- fiber
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- holographic grating
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- 239000000835 fiber Substances 0.000 title claims abstract description 59
- 238000012545 processing Methods 0.000 claims abstract description 11
- 239000013307 optical fiber Substances 0.000 claims abstract description 8
- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 238000009413 insulation Methods 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 239000013078 crystal Substances 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 2
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- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of fiber grating demodulation device based on volume holographic grating, described device comprises wideband light source, fiber grating, fiber coupler, optical fiber collimator, fiber collimating lenses, volume holographic grating, lens, photodetector, signal processing system, wireless launcher, radio receiver, described wideband light source, fiber coupler, fiber grating, optical fiber collimator, fiber collimating lenses, volume holographic grating, lens, photodetector, signal processing system, wireless launcher is connected in series, wireless launcher is connected by wireless signal with radio receiver.In this demodulating equipment, holographic grating demodulating equipment is simple, and sensor has sourceless characteristic, and the performance of this device electromagnetism interference is strong, lightweight, insulation, has water-fast, high temperature resistant, corrosion resistant chemical property simultaneously, enough under rugged environment, provides accurate Monitoring Data.
Description
Technical field
The utility model relates to fiber grating sensing technology field, particularly a kind of fiber grating demodulation device based on volume holographic grating.
Background technology
Along with the maturation of fiber grating manufacture craft, fiber grating starts to be applied in sensory field gradually.Compared with other sensors, fiber-optic grating sensor has the advantages such as volume is little, lightweight, sensitivity is high, accuracy is high, flexible, anti-electromagnetic interference capability is strong, corrosion resistivity is strong, high temperature resistant, can be widely used in monitoring strain, temperature, crack, displacement, vibration, stress and so on physical quantities.Therefore fiber grating pay close attention to by increasing researchist.
The monitoring principle of fiber grating be due to fiber grating centre wavelength along with temperature and stress change and change, if the drift therefore can measuring its centre wavelength accurately just can extrapolate the variable quantity of corresponding temperature or stress.
Existing fiber Bragg grating (FBG) demodulator is normally principle based on tunable Fabry-POLO wave filter, but because the piezoelectrics in its core devices tuning Fabry-POLO wave filter have sluggish wriggling, return the shortcomings such as stickiness, thus the poor real causing it to measure, and the drift of measurement result and actual value can be produced.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of fiber grating demodulation device based on volume holographic grating, by adopting volume holographic grating, to solve the above-mentioned multinomial defect caused in prior art.
For achieving the above object, the utility model provides following technical scheme: a kind of fiber grating demodulation device based on volume holographic grating, the described demodulating equipment based on volume holographic grating comprises wideband light source, fiber grating, fiber coupler, optical fiber collimator, fiber collimating lenses, volume holographic grating, lens, photodetector, signal processing system, wireless launcher, radio receiver, described wideband light source, fiber coupler, fiber grating, optical fiber collimator, fiber collimating lenses, volume holographic grating, lens, photodetector, signal processing system, wireless launcher is connected in series, wireless launcher is connected by wireless signal with radio receiver.
Preferably, described radio receiver is placed on apart from the monitoring room of its certain distance.
Preferably, described fiber grating demodulation device is also equipped with outdoor solar cell.
Preferably, described fiber coupler is FC fiber coupler.
Preferably, described photodetector is photon detector.
Preferably, digital signal processor is provided with in described signal processing system.
The beneficial effect of above technical scheme is adopted to be: should be simple based on holographic grating demodulating equipment in the fiber grating demodulation device of volume holographic grating, sensor has sourceless characteristic, the performance of this device electromagnetism interference is strong, lightweight, insulation, have water-fast simultaneously, high temperature resistant, corrosion resistant chemical property, enough under rugged environment, provide accurate Monitoring Data, this demodulating equipment can be monitored in the wild and be grown distance wireless transmission data, the energy used in the wild can adopt solar cell or wind energy to provide, environmental protection and energy saving, this monitoring device is applicable to various weather, anti-electromagnetic interference capability is strong, measuring accuracy is high, holdout device that can be long-term stable.
Accompanying drawing explanation
Fig. 1 is a kind of fiber grating demodulation apparatus structure schematic diagram based on volume holographic grating of the utility model;
Fig. 2 is a kind of fiber grating demodulation device principle of work schematic diagram based on volume holographic grating of the utility model.
Wherein, 1-wideband light source, 2-fiber coupler, 3-Fiber Bragg Grating FBG (FBG), 4-fiber collimating lenses, 5-volume holographic grating, 6-lens, 7-photodetector array, 8-signal processing system, 9-wireless launcher, 10-optical fiber collimator.
Embodiment
The preferred implementation of a kind of fiber grating demodulation device based on volume holographic grating of the utility model is described in detail below in conjunction with accompanying drawing.
Fig. 1 and Fig. 2 shows the embodiment of a kind of fiber grating demodulation device based on volume holographic grating of the utility model: should comprise wideband light source 1, Fiber Bragg Grating FBG 3, fiber coupler 2, optical fiber collimator 10, fiber collimating lenses 4, volume holographic grating 5, lens 6, photodetector array 7, signal processing system 8, wireless launcher 9, radio receiver based on the demodulating equipment of volume holographic grating, this demodulating equipment course of work is:
(1) volume holographic grating 5 is utilized to be used for separating the light of various wavelength, and the light of different wave length is injected on condenser lens 6 with the angle determined separately, receive the light of different wave length at the diverse location of photodetector array 7, thus differentiate the light of various wavelength;
(2) light source is sent to Fiber Bragg Grating FBG 3 after fiber coupler 2, and Fiber Bragg Grating FBG 3 reflects optical return signal with information to fiber coupler 2;
(3) reflected light signal enters fiber collimating lenses 4 by fiber coupler 2, incides on volume holographic grating 5, is separated by volume holographic grating 5 by different wave length;
(4) photodetector array 7 diverse location receives the different wavelengths of light separated by volume holographic grating 5, the spectral information of signal processing system 8 process place wavelength and intensity;
(5) information transmission after process to wireless launcher 9, and is received by radio receiver.
Fiber grating demodulation device Primary Component volume holographic grating 5 based on volume holographic grating 5 be with two bundle wavelength be λ
rcoherent laser beam to incide in photorefractive crystal record and inscribe volume holographic grating, suppose that this two-beam is respectively θ with the angle of Z axis in crystal
1and θ
2, after the exposure of certain hour, the grating vector recording grating in crystal is K.Then, be light beam this grating incident of λ with wavelength, the wave vector K of incident light
1with diffracted wave wave vector K
2triangle to be formed with wave vector K, and K
1and K
2equal and opposite in direction, be K
1=K
2=2 π/λ, therefore for given wavelength, K
1, K
2just can determine with the angle of K, when this crystal is penetrated in a branch of illumination containing different wave length, all can there is diffraction light at different directions in the incident light corresponding to different wave length.
Therefore based on the fiber grating demodulation device of volume phase grating, the light sent from wideband light source arrives generation reflection after Fiber Bragg Grating FBG 3 through coupling mechanism, this signal collimates through fiber collimating lenses 4 and is radiated on volume holographic grating 5, the reflected light of what therefore volume holographic grating 5 received is FBG sensor.The diffraction of the light generation different angles of different wave length, thus separated and form diffraction zone, these diffraction zones then scioptics 6 focusing illumination on the diverse location of photodetector array 7, the light signal of such different wave length is just distinguished by different angles, and detected by photodetector array 7, the light signal detected is converted into electric signal, restores corresponding Wavelength strength according to the electric signal of photodetector array 7, demodulates the centre wavelength that Fiber Bragg Grating FBG 3 reflects.Calculate the knots modification of the centre wavelength of Fiber Bragg Grating FBG 3, demodulate the change of the parameter such as temperature or stress further.The demodulation result stopped can be sent by wireless launcher, realizes the wireless transmission of long distance.The signal sent through wireless launcher 9 receive by radio receiver, and pass to corresponding computer terminal display monitoring result.
Above is only preferred implementation of the present utility model; it should be pointed out that for the person of ordinary skill of the art, under the prerequisite not departing from the utility model creation design; can also make some distortion and improvement, these all belong to protection domain of the present utility model.
Claims (6)
1. the fiber grating demodulation device based on volume holographic grating, it is characterized in that: the described demodulating equipment based on volume holographic grating comprises wideband light source, fiber grating, fiber coupler, optical fiber collimator, fiber collimating lenses, volume holographic grating, lens, photodetector, signal processing system, wireless launcher, radio receiver, described wideband light source, fiber coupler, fiber grating, optical fiber collimator, fiber collimating lenses, volume holographic grating, lens, photodetector, signal processing system, wireless launcher is connected in series, wireless launcher is connected by wireless signal with radio receiver.
2. the fiber grating demodulation device based on volume holographic grating according to claim 1, is characterized in that: described radio receiver is placed on apart from the monitoring room of its certain distance.
3. the fiber grating demodulation device based on volume holographic grating according to claim 1, is characterized in that: described fiber grating demodulation device is also equipped with outdoor solar cell.
4. the fiber grating demodulation device based on volume holographic grating according to claim 1, is characterized in that: described fiber coupler is FC fiber coupler.
5. the fiber grating demodulation device based on volume holographic grating according to claim 1, is characterized in that: described photodetector is photon detector.
6. the fiber grating demodulation device based on volume holographic grating according to claim 1, is characterized in that: be provided with digital signal processor in described signal processing system.
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| CN201420771059.6U CN204555996U (en) | 2014-12-09 | 2014-12-09 | A kind of fiber grating demodulation device based on volume holographic grating |
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| CN201420771059.6U CN204555996U (en) | 2014-12-09 | 2014-12-09 | A kind of fiber grating demodulation device based on volume holographic grating |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105973283A (en) * | 2016-06-06 | 2016-09-28 | 中国船舶重工集团公司第七〇九研究所 | Multichannel fiber Bragg grating demodulation system |
| CN108592959A (en) * | 2018-04-26 | 2018-09-28 | 北京赛智新创科技有限公司 | A kind of radiation resistance photoelectric encoder and motor |
| CN109597194A (en) * | 2018-12-28 | 2019-04-09 | 清华大学深圳研究生院 | A kind of solar concentrating system |
-
2014
- 2014-12-09 CN CN201420771059.6U patent/CN204555996U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105973283A (en) * | 2016-06-06 | 2016-09-28 | 中国船舶重工集团公司第七〇九研究所 | Multichannel fiber Bragg grating demodulation system |
| CN108592959A (en) * | 2018-04-26 | 2018-09-28 | 北京赛智新创科技有限公司 | A kind of radiation resistance photoelectric encoder and motor |
| CN109597194A (en) * | 2018-12-28 | 2019-04-09 | 清华大学深圳研究生院 | A kind of solar concentrating system |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150812 Termination date: 20171209 |