CN105628066B - Distributing optical fiber sensing detection and its demodulating system based on waveguide delay array - Google Patents
Distributing optical fiber sensing detection and its demodulating system based on waveguide delay array Download PDFInfo
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- CN105628066B CN105628066B CN201510966507.7A CN201510966507A CN105628066B CN 105628066 B CN105628066 B CN 105628066B CN 201510966507 A CN201510966507 A CN 201510966507A CN 105628066 B CN105628066 B CN 105628066B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 41
- 238000001514 detection method Methods 0.000 title abstract description 16
- 230000005622 photoelectricity Effects 0.000 claims abstract description 21
- 238000012545 processing Methods 0.000 claims abstract description 17
- 239000000835 fiber Substances 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000001069 Raman spectroscopy Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000001237 Raman spectrum Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000002839 fiber optic waveguide Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING 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
- G01D5/00—Mechanical 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
- G01D5/26—Mechanical 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 infrared, visible, or ultraviolet light
- G01D5/32—Mechanical 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 infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical 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 infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical 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 infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35338—Mechanical 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 infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
- G01D5/35354—Sensor working in reflection
- G01D5/35358—Sensor working in reflection using backscattering to detect the measured quantity
- G01D5/35364—Sensor working in reflection using backscattering to detect the measured quantity using inelastic backscattering to detect the measured quantity, e.g. using Brillouin or Raman backscattering
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Abstract
The present invention relates to the detection of the distributing optical fiber sensing based on waveguide delay array and its demodulating system, the detecting system includes sensor fibre, light source, Surveillance center, time delay controller and demodulating system, and the demodulating system includes coupler, data processing module, waveguide delay array and no less than one photoelectricity demodulation module；Waveguide delay array, the input connection coupler of the waveguide delay array are additionally provided with the system；The output end of the waveguide delay array is respectively connected to each photoelectricity demodulation module.The distributed optical fiber sensing system that the present invention designs avoids spatial resolution and restricted by physical principles such as pulse width, light quantum life-spans, the effective accuracy of detection and spatial resolution for improving distribution type fiber-optic system.
Description
Technical field
The present invention relates to the detection of the distributing optical fiber sensing based on waveguide delay array and its demodulating system, belongs to optical fiber biography
The technical field of sense.
Background technology
Distributing optical fiber sensing is to be based on OTDR (Optical Time Domain Reflection) optical time domain reflection skill
Art, according to light source from sending a little to the two-way time of test point, the tested point position on orientation sensing optical fiber, then by optical fiber
Sensitivity characteristic, detects the change of the environment parameter, and then realizes the change of environment parameter everywhere on whole piece sensor fibre, i.e. optical fiber point
The purpose of cloth sensing.Optical fiber used in distributed optical fiber sensing system is both sensor, and signal transmission medium, tool
Have the characteristics of sensing is integrated with transmission, and have without physical node, that stability is good, reliability is high, maintenance cost is low etc. is excellent
Point.Therefore, many researchers are directed to studying Distributed Optical Fiber Sensing Techniques at present.Various light path design schemes, signal are adopted
Quadrat method, signal processing method continuously emerge, and make the practical application foreground of Distributed Optical Fiber Sensing Techniques more and more wide.
But using distribution type fiber-optic technology it is determined that during tested point position, can be by light source pulsewidth, light pulse triggering frequency
The influence of the factors such as rate, light quantum life-span, signal sampling speed, the distributed optical fiber sensing system that prior art is built,
Test side only has one group of photoelectricity demodulation module, so each time point can only detect the shape of a point of distributed sensing fiber
State, the spacing between different test points, that is, so-called spatial resolution, are determined by the time difference of adjacent detection moment, and most
Small time interval is then limited by the pulse width of light source.If pulse width is too small, inevitable light quantum life-span in by optical fiber
Limitation, so can not unrestrictedly reduce the width of light pulse to improve the spatial resolution of distribution type fiber-optic.Therefore, it is distributed
There is the restriction of this physical principle in formula optical fiber sensing technology, the spatial discrimination for causing optical fiber distributed type technology to reach in itself
Rate is extremely limited.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is proposed that the distribution type fiber-optic based on waveguide delay array
Sensing and detecting system, improved on the base of existing distributing optical fiber sensing detecting system, solve distribution type fiber-optic
Restricted in sensing technology by physical principles such as pulse width, light quantum life-spans, and influence the technology of its spatial resolution raising
Problem, the invention also provides a kind of distributing optical fiber sensing demodulating system based on waveguide delay array.
The present invention is achieved by following scheme：
1. the distributing optical fiber sensing detecting system based on waveguide delay array, the detecting system includes sensor fibre, light
Source, Surveillance center and demodulating system, the demodulating system include coupler, data processing module, waveguide delay array and many
In a photoelectricity demodulation module, the input connection coupler of the waveguide delay array；The output end of the waveguide delay array
It is respectively connected to each photoelectricity demodulation module.
Further, time delay controller is additionally provided with the detecting system, the output of the time delay controller is used to connect waveguide
Time delay array, the input of time delay controller are connected with Surveillance center.
Further, described waveguide delay array is fixed delay array, or is controllable time delay array.
Further, described photoelectricity demodulation module includes wavelength division multiplexer, photoelectric conversion module and signal amplifier；Its
The input of middle wavelength division multiplexer is connected to the output of waveguide delay array；The output of wavelength-division multiplex is arranged with two branch roads, respectively
Branch road is sequentially connected photoelectric conversion module, signal amplifier and A/D converter, and the output of A/D converter is used to connect at data
Manage module.
2. the distributing optical fiber sensing demodulating system based on waveguide delay array, the demodulating system includes coupler, data
Processing module, waveguide delay array and no less than one photoelectricity demodulation module, the input connection coupling of the waveguide delay array
Clutch；The output end of the waveguide delay array is respectively connected to each photoelectricity demodulation module.
Further, described waveguide delay array is fixed delay array, or is controllable time delay array.
Further, described photoelectricity demodulation module includes wavelength division multiplexer, photoelectric conversion module, signal amplifier and A/
D converters；The input of wherein wavelength division multiplexer is connected to the output of waveguide delay array；The output of wavelength-division multiplex is arranged with two
Bar branch road, each branch road are sequentially connected photoelectric conversion module, signal amplifier and A/D converter, and the output of A/D converter is used to connect
Connect data processing module.
Present invention beneficial effect compared to the prior art is：
Existing Distributed Optical Fiber Sensing Techniques are restricted by the intrinsic physical principle such as pulse width, light quantum life-span,
The lifting of spatial resolution is caused to be restricted.The present invention proposes the distributing optical fiber sensing detection based on waveguide delay array
And its demodulating system, it is made that improvement in existing distributed fiber optic temperature detecting system.By being passed to original distribution type fiber-optic
Waveguide delay array is added in sensing system, the separation detection to test point is realized, spatial resolution is controlled by time delay array
Design and control, the response mechanism without the physical principle in by distributing optical fiber sensing are restricted.Designed by the present invention
Distribution type fiber-optic system is detected, as long as data processing is suitable, method is reasonable, you can improves the precision and spatial discrimination of detection
Rate, and then improve overall the detection performance index and detection speed of distributed optical fiber sensing system.
Brief description of the drawings
Fig. 1 is the principle schematic of DTS distributed fiber optic temperatures detecting system in the prior art；
Fig. 2 is the principle of DTS distributing optical fiber sensing detection and its demodulating system of the present invention based on waveguide delay array
Schematic diagram.
Embodiment
The present invention will be further described in detail with reference to the accompanying drawings and examples.
The present invention proposes a kind of distributing optical fiber sensing detection based on waveguide delay array and its demodulating system, such as schemes
Shown in 2, the detecting system includes sensor fibre, light source, Surveillance center, time delay controller and demodulating system, the demodulation system
System includes coupler, waveguide delay array, data processing module and multiple photoelectricity demodulation modules.Wherein, light source passes through coupler
It is connected to the upper of optical fiber, the input connection coupler of fiber waveguide time delay array；The output end of the waveguide delay array connects respectively
Enter each photoelectricity demodulation module,
Wherein, waveguide delay array is made up of several waveguides, and waveguide can also be replaced with the optical fiber of different length.Waveguide
Propagation parameter can by control photoelectron technology means change time delay size.
Photoelectricity demodulation module includes wavelength division multiplexer, photoelectric conversion module and signal amplifier；Wherein wavelength division multiplexer
Input is connected to the output of waveguide delay array；The output of wavelength-division multiplex is arranged with two branch roads, and each branch road is sequentially connected light
Electric modular converter, signal amplifier and A/D converter, the output of A/D converter are connected in data processing module.Data processing mould
The output of block is connected with Surveillance center, the electric signal for transmission process.Time delay waveguide array is further connected with time delay controller.Time delay
Controller, light source and photoelectricity demodulation module are all connected with Surveillance center, are controlled by Surveillance center.
Surveillance center is made up of central control computer, and central control computer control light source sends pulsed light.Pulsed light is through coupler
Sensor fibre is injected after light splitting, in sensor fibre Raman scattering will occur for injected pulse light, and be reflected back the coupler of input.
The single terminal input through waveguide delay array enters waveguide delay array to reflected light through coupler again, in waveguide delay array
By being coupled into some different waveguides of propagation parameter, reflected light is respectively transmitted after waveguide delay array to each light
Electric demodulation module, reflected light transmits out Raman signal light in each photoelectricity demodulation module through wavelength division multiplexer, and is respectively transmitted
Into two branch roads, one of branch road transmits Stokes Raman signal, and another branch road transmits anti-Stokes Raman signal.
This two paths of signals light is sent into data processing module after photoelectric conversion module and signal amplifier, real in signal processing module
The demodulation and analysis of existing Raman spectrum, the detection point location and detection limit parameter for realizing distributed optical fiber sensing system calculate, and
Testing result is transferred to central control computer.
The present invention is by introducing a waveguide delay array, and the time that the light exported according to light from different waveguide is undergone is not
Together, even it can also distinguish each signal for same time tranfer to the signal in each waveguide and correspond to sensor fibre
Position, therefore, the distributed electro-optical system detection distribution type fiber-optic synchronization can be utilized in the information of different test points.Together
Sample, by controlling sampling time sequence, it can also realize and at different moments, detect the biography from same point on the optical fiber of each waveguide output
Feel signal, that is, detect the information of same test point in distribution type fiber-optic at different moments.
Controllable time delay array also may be selected to be fixed delay array in waveguide delay permutation of the present invention.
The light source that the present invention selects is LASER Light Source, as other embodiment, can equally choose the light of other forms
Transmitted for optical fiber in source.
Under the thinking that the present invention provides, to above-mentioned implementation by the way of being readily apparent that to those skilled in the art
Technological means in example enters line translation, replacement, modification, and plays a part of and the basic phase of relevant art means in the present invention
Goal of the invention that is same, realizing is also essentially identical, and the technical scheme so formed is finely adjusted to be formed to above-described embodiment, this
Kind technical scheme is still fallen within protection scope of the present invention.
Claims (7)
1. the distributing optical fiber sensing detecting system based on waveguide delay array, it is characterised in that the detecting system includes sensing
Optical fiber, light source, Surveillance center and demodulating system, the demodulating system include coupler, data processing module, waveguide delay array
With no less than one photoelectricity demodulation module, the light source is connected on sensor fibre by coupler；The waveguide delay array
Input connection coupler；The output end of the waveguide delay array is respectively connected to each photoelectricity demodulation module, each photoelectrolysis
The output end connection data processing module of mode transfer block, light source and data processing module are connected with Surveillance center.
2. the distributing optical fiber sensing detecting system according to claim 1 based on waveguide delay array, it is characterised in that
Time delay controller is additionally provided with the detecting system, the output of the time delay controller is used to connect waveguide delay array, timing_delay estimation
The input of device is connected with Surveillance center.
3. the distributing optical fiber sensing detecting system according to claim 1 based on waveguide delay array, it is characterised in that
Described waveguide delay array is fixed delay array, or is controllable time delay array.
4. the distributing optical fiber sensing detecting system according to claim 1 based on waveguide delay array, it is characterised in that
Described photoelectricity demodulation module includes wavelength division multiplexer, photoelectric conversion module, signal amplifier and A/D converter；Wherein wavelength-division
The input of multiplexer is connected to the output of waveguide delay array；The output of wavelength-division multiplex is arranged with two branch roads, each branch road according to
Secondary connection photoelectric conversion module, signal amplifier and A/D converter, the output of A/D converter are used to connect data processing module.
5. the distributing optical fiber sensing demodulating system based on waveguide delay array, it is characterised in that the demodulating system includes coupling
Device, data processing module, waveguide delay array and no less than one photoelectricity demodulation module, the input of the waveguide delay array
Connect coupler；The output end of the waveguide delay array is respectively connected to each photoelectricity demodulation module, each photoelectricity demodulation module
Output end connects data processing module.
6. the distributing optical fiber sensing demodulating system according to claim 5 based on waveguide delay array, it is characterised in that
Described waveguide delay array is fixed delay array, or is controllable time delay array.
7. the distributing optical fiber sensing demodulating system according to claim 5 based on waveguide delay array, it is characterised in that
Described photoelectricity demodulation module includes wavelength division multiplexer, photoelectric conversion module, signal amplifier and A/D converter；Wherein wavelength-division
The input of multiplexer is connected to the output of waveguide delay array；The output of wavelength-division multiplex is arranged with two branch roads, each branch road according to
Secondary connection photoelectric conversion module, signal amplifier and A/D converter, the output of A/D converter are used to connect data processing module.
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| CN101000267A (en) * | 2006-12-25 | 2007-07-18 | 福建迅捷光电科技有限公司 | Parallel distribution optical fibre raster temp. sensing method and its system |
| EP2440896A2 (en) * | 2009-06-08 | 2012-04-18 | Sensortran, Inc. | High sampling resolution dts system and method |
| KR101268115B1 (en) * | 2011-03-21 | 2013-05-29 | (주)파이버프로 | Multi channel physical quantity high speed measuerment system of using optical spectrometer |
| CN103969217A (en) * | 2014-05-06 | 2014-08-06 | 中国工程物理研究院流体物理研究所 | Wavelength division multiplexing optical fiber hydrogen sensing system capable of achieving multi-point monitoring |
| CN104198030B (en) * | 2014-08-29 | 2017-11-10 | 中国石油天然气股份有限公司 | Multichannel method for detecting vibration and its detecting system based on coherent rayleigh scattering |
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