CN105628066A - Waveguide time delay array-based distributed optical fiber sensing detection and demodulation system - Google Patents
Waveguide time delay array-based distributed optical fiber sensing detection and demodulation system Download PDFInfo
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- CN105628066A CN105628066A CN201510966507.7A CN201510966507A CN105628066A CN 105628066 A CN105628066 A CN 105628066A CN 201510966507 A CN201510966507 A CN 201510966507A CN 105628066 A CN105628066 A CN 105628066A
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- time delay
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 42
- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 14
- 230000005622 photoelectricity Effects 0.000 claims description 19
- 239000000835 fiber Substances 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 238000001069 Raman spectroscopy Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001237 Raman spectrum Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 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
- 230000008569 process Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011160 research 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
- 230000002463 transducing effect Effects 0.000 description 1
- 238000012546 transfer 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
Abstract
The invention relates to a waveguide time delay array-based distributed optical fiber sensing detection and demodulation system. The detection system comprises a sensing optical fiber, an optical source, a monitoring center, a time delay controller and a demodulation system, wherein the demodulation system comprises a coupler, a data processing module, a waveguide time delay array and no less than one photoelectric demodulation module. The system is also provided with the waveguide time delay array. The input end of the waveguide time delay array is connected with the coupler, and the output end of the waveguide time delay array is connected with each photoelectric demodulation module respectively. According to the distributed optical fiber sensing system, the spatial resolution can be prevented from being restrained by physical principles such as the pulse width and photon service life, and the detection precision and the spatial resolution of the distributed optical fiber system can be effectively improved.
Description
Technical field
The present invention relates to the distributing optical fiber sensing based on waveguide delay array to detect and demodulating system, belong to the technical field of Fibre Optical Sensor.
Background technology
Distributing optical fiber sensing is based on OTDR (OpticalTimeDomainReflection) optical time domain reflection technology, according to light source from sending a little to the two-way time of test point, tested point position on orientation sensing optical fiber, rely on the sensitivity characteristic of optical fiber again, detect the change of this environment parameter, and then realize the change of environment parameter everywhere on whole piece sensor fibre, the i.e. purpose of distributed fiber-optic sensor. The optical fiber used in distributed optical fiber sensing system is sensor, is also signal transmission medium, has sensing and an integrated feature of transmission, and has without advantages such as physical node, good stability, reliability height, maintenance cost are low. Therefore, a lot of researchers are devoted to research Distributed Optical Fiber Sensing Techniques at present. Various light path design schemes, signal sampling method, signal processing method constantly occur, the practical application foreground making Distributed Optical Fiber Sensing Techniques is more and more wide.
But, utilize distribution type fiber-optic technology when determining tested point position, light source pulsewidth can be subject to, light pulse triggers frequency, the light quantum life-span, the impact of the factors such as signal sampling speed, the distributed optical fiber sensing system that prior art is built, one group of photoelectricity demodulation module is only had in test side, so each time point can only detect the state of a point of distributed sensing fiber, spacing between different test points, namely so-called spatial resolution, determined by the time difference in adjacent detection moment, minimum interval is then by the restriction of the pulse width of light source. if pulse width is too little, necessarily by the restriction in light quantum life-span in optical fiber, so the width of light pulse can not unrestrictedly be reduced to improve the spatial resolution of distribution type fiber-optic. therefore, there is the restriction of this physical principle in Distributed Optical Fiber Sensing Techniques itself, causes that the spatial resolution that optical fiber distributed type technology can reach is extremely limited.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, propose the distributing optical fiber sensing based on waveguide delay array and detect system, the base that existing distributing optical fiber sensing detects system has improved, solve the restriction by the physical principle such as pulse width, light quantum life-span in Distributed Optical Fiber Sensing Techniques, and affect the technical problem that its spatial resolution improves, the invention allows for a kind of distributing optical fiber sensing demodulating system based on waveguide delay array.
The present invention is achieved by following scheme:
1. detect system based on the distributing optical fiber sensing of waveguide delay array, this detection system includes sensor fibre, light source, Surveillance center and demodulating system, described demodulating system includes bonder, data processing module, waveguide delay array and no less than a photoelectricity demodulation module, and the input of described waveguide delay array connects bonder; The outfan of this waveguide delay array is respectively connected to each photoelectricity demodulation module.
Further, being additionally provided with time delay controller in this detection system, the output of this time delay controller is used for connecting waveguide delay array, and the input of time delay controller is 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; Wherein the input of wavelength division multiplexer 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 with photoelectric conversion module, signal amplifier and A/D converter, and the output of A/D converter is used for connecting data processing module.
2., based on the distributing optical fiber sensing demodulating system of waveguide delay array, this demodulating system includes bonder, data processing module, waveguide delay array and no less than a photoelectricity demodulation module, and the input of described waveguide delay array connects bonder; The outfan of this 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 converter; Wherein the input of wavelength division multiplexer 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 with photoelectric conversion module, signal amplifier and A/D converter, and the output of A/D converter is used for connecting data processing module.
Compared to the prior art the present invention provides the benefit that:
Existing Distributed Optical Fiber Sensing Techniques is subject to the restriction of the intrinsic physical principle such as pulse width, light quantum life-span, causes that the lifting of spatial resolution is restricted. The present invention proposes the distributing optical fiber sensing based on waveguide delay array and detects and demodulating system, detects system at existing distributed fiber optic temperature and is made that improvement. By to original distributed optical fiber sensing system adds waveguide time delay array, realize the separation detection to test point, spatial resolution is made to be controlled by design and the control of time delay array, and not by the restriction of the response mechanism of the physical principle in distributing optical fiber sensing. The distribution type fiber-optic system designed by the present invention is detected, and is suitable for as long as data process, and method is reasonable, can improve precision and the spatial resolution of detection, and then improve overall detection performance indications and the detection speed of distributed optical fiber sensing system.
Accompanying drawing explanation
Fig. 1 is the principle schematic of DTS distributed fiber optic temperature detection system in prior art;
Fig. 2 is the principle schematic of the present invention DTS distributing optical fiber sensing detection based on waveguide delay array and demodulating system thereof.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described in detail.
The present invention proposes a kind of distributing optical fiber sensing based on waveguide delay array and detects and demodulating system, as shown in Figure 2, this detection system includes sensor fibre, light source, Surveillance center, time delay controller and demodulating system, and described demodulating system includes bonder, waveguide delay array, data processing module and multiple photoelectricity demodulation module. Wherein, light source is connected to the upper of optical fiber by bonder, and the input of fiber waveguide time delay array connects bonder; The outfan of this waveguide delay array is respectively connected to each photoelectricity demodulation module,
Wherein, waveguide delay array is made up of several waveguides, and waveguide can also replace with the optical fiber of different length. The propagation parameter of waveguide can pass through to control photoelectron technology means and change the size of time delay.
Photoelectricity demodulation module includes wavelength division multiplexer, photoelectric conversion module and signal amplifier; Wherein the input of wavelength division multiplexer 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 with photoelectric conversion module, signal amplifier and A/D converter, and the output of A/D converter is connected in data processing module. The output of data processing module is connected with Surveillance center, for the signal of telecommunication of 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, Surveillance center controlled.
Surveillance center is made up of middle control computer, and middle control computer controls light source and sends pulsed light. Pulsed light injects sensor fibre after bonder light splitting, and injected pulse light, at sensor fibre, Raman scattering will occur, and be reflected back the bonder of input. Through bonder reflection light then through waveguide delay array single terminal input enter waveguide delay array, by being coupled into some the different waveguides of propagation parameter in waveguide delay array, reflection light is respectively transmitted to each photoelectricity demodulation module after waveguide delay array, reflection light transmits out Raman signal light through wavelength division multiplexer in each photoelectricity demodulation module, and it is respectively transmitted in two branch roads, one of them branch road transmission Stokes Raman signal, another branch road transmission anti-Stokes Raman signal. This two paths of signals light is after photoelectric conversion module and signal amplifier, send into data processing module, demodulation and the analysis of Raman spectrum is realized in signal processing module, the test point location and the detection limit parameter that realize distributed optical fiber sensing system calculate, and testing result is transferred to middle control computer.
The present invention is by introducing a waveguide delay array, different from the time that the light that different waveguide exports experiences according to light, even if for the signal in same time tranfer to each waveguide, the position of each signal correspondence sensor fibre can also be distinguished, therefore, it can the information utilizing this distributed electro-optical system detection distribution type fiber-optic synchronization at different test points. Equally, by controlling sampling time sequence, it is also possible to realize not in the same time, detect from the transducing signal of same point the optical fiber that each waveguide exports, namely detect not the information of same test point in distribution type fiber-optic in the same time.
Waveguide delay permutation of the present invention is to be fixed delay array, it is possible to select controllable time delay array.
The light source that the present invention selects is LASER Light Source, and as other embodiments, the equally possible light source choosing other forms is for fiber-optic transfer.
Under the thinking that the present invention provides; adopt the mode being readily apparent that to those skilled in the art that the technological means in above-described embodiment is converted, replaces, revised; and the goal of the invention that the effect played is essentially identical with the relevant art means in the present invention, realize is also essentially identical; above-described embodiment is carried out fine setting and is formed by the technical scheme so formed, and this technical scheme still falls within protection scope of the present invention.
Claims (7)
1. detect system based on the distributing optical fiber sensing of waveguide delay array, it is characterized in that, this detection system includes sensor fibre, light source, Surveillance center and demodulating system, described demodulating system includes bonder, data processing module, waveguide delay array and no less than a photoelectricity demodulation module, and the input of described waveguide delay array connects bonder; The outfan of this waveguide delay array is respectively connected to each photoelectricity demodulation module.
2. the distributing optical fiber sensing based on waveguide delay array according to claim 1 detects system, it is characterized in that, being additionally provided with time delay controller in this detection system, the output of this time delay controller is used for connecting waveguide delay array, and the input of time delay controller is connected with Surveillance center.
3. the distributing optical fiber sensing based on waveguide delay array according to claim 1 detects system, 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 based on waveguide delay array according to claim 1 detects system, it is characterised in that described photoelectricity demodulation module includes wavelength division multiplexer, photoelectric conversion module, signal amplifier and A/D converter; Wherein the input of wavelength division multiplexer 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 with photoelectric conversion module, signal amplifier and A/D converter, and the output of A/D converter is used for connecting data processing module.
5. based on the distributing optical fiber sensing demodulating system of waveguide delay array, it is characterized in that, this demodulating system includes bonder, data processing module, waveguide delay array and no less than a photoelectricity demodulation module, and the input of described waveguide delay array connects bonder; The outfan of this waveguide delay array is respectively connected to each photoelectricity demodulation module.
6. the distributing optical fiber sensing demodulating system based on waveguide delay array according to claim 5, it is characterised in that described waveguide delay array is fixed delay array, or be controllable time delay array.
7. the distributing optical fiber sensing demodulating system based on waveguide delay array according to claim 5, it is characterised in that described photoelectricity demodulation module includes wavelength division multiplexer, photoelectric conversion module, signal amplifier and A/D converter; Wherein the input of wavelength division multiplexer 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 with photoelectric conversion module, signal amplifier and A/D converter, and the output of A/D converter is used for connecting data processing module.
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Citations (5)
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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 |
| US20120105826A1 (en) * | 2009-06-08 | 2012-05-03 | Kent Kalar | High Sampling Resolution DTS System and Method |
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| CN104198030A (en) * | 2014-08-29 | 2014-12-10 | 中国石油天然气股份有限公司 | Multi-channel vibration detection method based on coherent Rayleigh scattering and detection system thereof |
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- 2015-12-21 CN CN201510966507.7A patent/CN105628066B/en not_active Expired - Fee Related
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| US20120105826A1 (en) * | 2009-06-08 | 2012-05-03 | Kent Kalar | High Sampling Resolution DTS System and Method |
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