CN103575314B - Distributed optical fiber sensing system - Google Patents
Distributed optical fiber sensing system Download PDFInfo
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- CN103575314B CN103575314B CN201210261783.XA CN201210261783A CN103575314B CN 103575314 B CN103575314 B CN 103575314B CN 201210261783 A CN201210261783 A CN 201210261783A CN 103575314 B CN103575314 B CN 103575314B
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Abstract
A kind of distributed optical fiber sensing system, comprise the Raman pulse pump light source of generation Raman pulse pump light, the first pump light shunt, the first Raman signal attenuator, first wave division multiplexer, Second Wave division multiplexer, first, the second sensor fibre and Raman signal processing control apparatus.The pulse pump light that Raman pulse pump light source produces by this distributed optical fiber sensing system passes through the first pump light shunt by pulse pump light along separate routes to reduce power, and a wherein road pulse pump light is prevented the appearance of stimulated raman scattering by the first Raman signal attenuator, thus reach the object of long range propagation.
Description
Technical field
The present invention relates to a kind of optical sensor system, particularly relate to a kind of distributed optical fiber sensing system.
Background technology
In recent years, the distributed optical fiber sensing system based on Raman scattering effect obtains very fast development, but due to Raman scattering signal light very faint, generally improve signal intensity by the way of intensifier pulse pumping light power.But along with the raising of pulse pump luminous power, the nonlinear effect of optical fiber occurs, even occurs stimulated raman scattering.Once there is stimulated Raman scattering, Raman signal will increase extremely, causes demodulating normal heat transfer agent.In conventional distributed optical fiber sensing system, pulse pump light is generally and injects sensor fibre nearby, pulse pump light and Raman signal light transmit in same optical fiber, so pulse pump luminous power is higher, sensor fibre is longer, more easily occur stimulated raman scattering, stimulated Raman scattering will cause demodulating normal heat transfer agent.Therefore conventional distributed optical fiber sensing system cannot reach long range propagation.
Summary of the invention
Based on this, be necessary to provide a kind of can the distributed optical fiber sensing system of long range propagation.
A kind of distributed optical fiber sensing system, comprise the Raman pulse pump light source producing Raman pulse pump light, to be connected by optical fiber with Raman pulse pump light source and by the first pump light shunt of Raman pulse pump light by power light splitting, the first wave division multiplexer be connected by optical fiber with the first pump light shunt, to be connected with Raman pulse pump light source with first wave division multiplexer and light signal to be carried out to the Raman signal processing control apparatus of analyzing and processing, be connected and the first Raman signal attenuator preventing stimulated Raman scattering signal from occurring by optical fiber with the first pump light shunt, the Second Wave division multiplexer be connected by optical fiber with the first Raman signal attenuator, be connected with Second Wave division multiplexer and produce and transmit the second sensor fibre of transducing signal and be connected first wave division multiplexer and Second Wave division multiplexer and produce and the first sensor fibre of transmission transducing signal.
Wherein in an embodiment, described distributed optical fiber sensing system also comprises the Raman signal Transmission Fibers described Second Wave division multiplexer and described Raman signal processing control apparatus coupled together.
Wherein in an embodiment, described distributed optical fiber sensing system is also comprised and to be connected by optical fiber with the first Raman signal attenuator and Second Wave division multiplexer and by by the light of described first Raman signal attenuator the second pump light shunt by power light splitting, be connected and the second Raman signal attenuator preventing stimulated Raman scattering signal from occurring by optical fiber with the second pump light shunt, the 3rd wavelength division multiplexer be connected by optical fiber with the second Raman signal attenuator and being connected with the 3rd wavelength division multiplexer is produced and the 3rd sensor fibre transmitting transducing signal, described 3rd wavelength division multiplexer is connected by the second sensor fibre with described Second Wave division multiplexer.
Wherein in an embodiment, described first wave division multiplexer and Second Wave division multiplexer are film filtering slice wavelength division multiplexer.
Wherein in an embodiment, described first Raman signal attenuator is film filtering slice formula attenuator.
Wherein in an embodiment, described first pump light shunt is fused tapered or planar type optical waveguide fiber optic splitter.
Wherein in an embodiment, described from the first pump light shunt light out through first wave division multiplexer transfer to Second Wave division multiplexer length through path from from the first pump light shunt light out through the first Raman signal attenuator transfer to Second Wave division multiplexer length through path different.
The pulse pump light that Raman pulse pump light source produces by above-mentioned distributed optical fiber sensing system passes through the first pump light shunt by pulse pump light along separate routes to reduce power, and a wherein road pulse pump light is prevented the appearance of stimulated raman scattering by the first Raman signal attenuator, thus reach the object of long range propagation.
Accompanying drawing explanation
Fig. 1 is a distributed optical fiber sensing system schematic diagram;
Fig. 2 is the distributed optical fiber sensing system schematic diagram of another embodiment.
Embodiment
Please refer to Fig. 1, an embodiment provides a kind of distributed optical fiber sensing system, this distributed optical fiber sensing system comprises the Raman pulse pump light source 110 producing Raman pulse pump light, to be connected by optical fiber with Raman pulse pump light source 110 and the Raman pulse pump light produced by the first pump light shunt 120 of power light splitting, the first wave division multiplexer 130 be connected by optical fiber with the first pump light shunt 120, to be connected with Raman pulse pump light source 110 with first wave division multiplexer 130 and light signal to be carried out to the Raman signal processing control apparatus 140 of analyzing and processing, be connected and the first Raman signal attenuator 150 preventing stimulated Raman scattering signal from occurring by optical fiber with the first pump light shunt 120, the Second Wave division multiplexer 160 be connected by optical fiber with the first Raman signal attenuator 150, be connected with Second Wave division multiplexer 160 and produce and transmit the second sensor fibre 170 of transducing signal and be connected first wave division multiplexer 130 and Second Wave division multiplexer 160 produces and the first sensor fibre 180 of transmission transducing signal.
This distributed optical fiber sensing system also comprises the Raman signal Transmission Fibers 190 Second Wave division multiplexer 160 and Raman signal processing control apparatus 140 coupled together.Like this, during use, the Raman signal separated directly can be transferred to Raman signal processing control apparatus 140 from Second Wave division multiplexer 160, and without first wave division multiplexer 130, to reduce interference, improve signal transmission quality.
First wave division multiplexer 130 and the Second Wave division multiplexer 160 of this distributed optical fiber sensing system are film filtering slice wavelength division multiplexer.First Raman signal attenuator 150 is film filtering slice formula attenuator.This filter plate be the wavelength of pulse pump light through wavelength, only allow pulse pump light transmission, Raman signal can not be through, significantly decayed.Or the reflection wavelength of this wave filter is the wavelength of pulse pump light, and pulse pump light is entered next stage Optical Fiber Transmission by reflection, and Raman signal is through filter plate, is significantly decayed.
First pump light shunt 120 of this distributed optical fiber sensing system can be fused tapered or planar type optical waveguide fiber optic splitter.
In addition, from the first pump light shunt 120 light out through first wave division multiplexer 130 transfer to Second Wave division multiplexer 160 length through path from from the first pump light shunt 120 light out through the first Raman signal attenuator 150 transfer to Second Wave division multiplexer 160 length through path different.Like this, two ways of optical signals can be avoided simultaneously to arrive Second Wave division multiplexer 160, spatially it is staggered mutually, avoid mutual impact, thus improve transmission quality.
The optical fiber be connected between first wave division multiplexer 130 with Second Wave division multiplexer 160 is the first sensor fibre 180.To be injected by first wave division multiplexer 130 through the wherein road Raman pulse pump light of pump light shunt 120 and pass back to Raman signal processing control apparatus 140 after backward Raman scattering light that first sensor fibre 180, first sensor fibre 180 produces is separated by first wave division multiplexer 130 and carry out analyzing and processing.
Introduce this distributed optical fiber sensing system course of work below.First, Raman pulse pump light source 110 produces pulse pump light; Pulse pump light is transmitted through the fiber to the first pump light shunt 120, the Raman pulse pump light that Raman pulse pump light source 110 produces by this first pump light shunt 120 carries out light splitting (light splitting ratio also can be other suitable ratio) in power with 2 to 8, wherein power be 2 a road Raman pulse pump light be sent to first wave division multiplexer 130, power be 8 a road Raman pulse pump light be sent to the first Raman signal attenuator 150; Then, Raman pulse pump light by it is transmitted through the fiber to Second Wave division multiplexer 160 by the first Raman signal attenuator 150, the second sensor fibre 170 is injected by Second Wave division multiplexer, the Raman signal decay that optical fiber produces by the first Raman signal attenuator 150 prevents the appearance of stimulated raman scattering from significantly decaying to ensure pulse pump light to be unlikely to convert Raman signal in a large number, ensures the through-put power of pulse pump light; Meanwhile, be injected into after backward Raman scattering light that the first sensor fibre 180, first sensor fibre 180 produces is separated by first wave division multiplexer 130 through the pulse pump light of first wave division multiplexer 130 and pass back to Raman signal processing control apparatus 140; The backward Raman scattering light that second sensor fibre 170 produces is returned by Second Wave division multiplexer 160; The light signal of passback directly can be transmitted back to Raman signal processing control apparatus 140 by Raman signal Transmission Fibers 190, or is transmitted back to Raman signal processing control apparatus 140 after the first sensor fibre 180 and first wave division multiplexer 130; Raman signal processing control apparatus 140 carries out to the backward Raman scattering light passed back the data that analyzing and processing can obtain needs.
The pulse pump light that Raman pulse pump light source 110 produces by this distributed optical fiber sensing system by the first pump light shunt 120 by pulse pump light along separate routes to reduce power, and a wherein road pulse pump light is prevented the appearance of stimulated raman scattering by the first Raman signal attenuator 150, to increase transmission range.Therefore this distributed optical fiber sensing system has the advantage of long transmission distance.
In addition, to reinject back segment sensor fibre (being herein the second sensor fibre 170) because the pulse pump light that Raman pulse pump light source 110 produces to be transmitted a segment distance by this distributed optical fiber sensing system, the flashlight avoiding pulse pump light needed for back segment sensor fibre and leading portion sensor fibre (being the first sensor fibre 180) herein transmits in same optical fiber, reduce the pulse pump luminous power of leading portion sensor fibre, reduce the stimulated raman scattering of leading portion sensor fibre.In addition, the ratio of the pulse pump luminous power transmitted with leading portion sensor fibre by the pulse pump luminous power strengthening the transmission of back segment sensor fibre, the light signal of back segment sensor fibre is strengthened, compensate for back segment sensor fibre apart from the oversize signal attenuation caused, increase the signal to noise ratio (S/N ratio) of back segment sensor fibre, effectively inhibit sensor fibre distance far away, the problem that transducing signal is more weak.
Please refer to Fig. 2, in another embodiment, this distributed optical fiber sensing system is also comprised and to be connected by optical fiber with the first Raman signal attenuator 150 and Second Wave division multiplexer 160 and by by the light of the first Raman signal attenuator 150 the second pump light shunt 220 by power light splitting, be connected and the second Raman signal attenuator 250 preventing stimulated Raman scattering signal from occurring by optical fiber with the second pump light shunt 220, the 3rd wavelength division multiplexer 260 be connected by optical fiber with the second Raman signal attenuator 250 and being connected with the 3rd wavelength division multiplexer 260 is produced and the 3rd sensor fibre 270 transmitting transducing signal.In addition, the 3rd wavelength division multiplexer 260 is connected by the second sensor fibre 170 with Second Wave division multiplexer 160
In this embodiment, this distributed optical fiber sensing system increases transmission range further by increase Raman signal attenuator (the second Raman signal attenuator 250) and a wavelength division multiplexer (the 3rd wavelength division multiplexer 260).In other embodiments, the quantity that those skilled in the art person can continue to increase Raman signal attenuator and wavelength division multiplexer according to actual needs in this manner increases transmission range further.Such as on the basis of above-mentioned distributed optical fiber sensing system, suitably increase the devices such as Raman signal attenuator, pump light shunt, wavelength division multiplexer, sensor fibre, with further cascade, form multistage sensing system, better to increase transmission range, repeat no more herein.
The pulse pump light that Raman pulse pump light source produces by this distributed optical fiber sensing system passes through pump light shunt by pulse pump light along separate routes to reduce power, and a wherein road pulse pump light is prevented the appearance of stimulated raman scattering by Raman signal attenuator, to increase transmission range.Therefore this distributed optical fiber sensing system has the advantage of long transmission distance.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (7)
1. a distributed optical fiber sensing system, it is characterized in that, comprise the Raman pulse pump light source producing Raman pulse pump light, to be connected by optical fiber with Raman pulse pump light source and by the first pump light shunt of Raman pulse pump light by power light splitting, the first wave division multiplexer be connected by optical fiber with the first pump light shunt, to be connected with Raman pulse pump light source with first wave division multiplexer and light signal to be carried out to the Raman signal processing control apparatus of analyzing and processing, be connected and the first Raman signal attenuator preventing stimulated Raman scattering signal from occurring by optical fiber with the first pump light shunt, the Second Wave division multiplexer be connected by optical fiber with the first Raman signal attenuator, be connected with Second Wave division multiplexer and produce and transmit the second sensor fibre of transducing signal and be connected first wave division multiplexer and Second Wave division multiplexer and produce and the first sensor fibre of transmission transducing signal, described first Raman signal attenuator is in order to Raman signal of decaying.
2. distributed optical fiber sensing system according to claim 1, is characterized in that, described distributed optical fiber sensing system also comprises the Raman signal Transmission Fibers described Second Wave division multiplexer and described Raman signal processing control apparatus coupled together.
3. distributed optical fiber sensing system according to claim 1, it is characterized in that, described distributed optical fiber sensing system is also comprised and to be connected by optical fiber with the first Raman signal attenuator and Second Wave division multiplexer and by by the light of described first Raman signal attenuator the second pump light shunt by power light splitting, be connected and the second Raman signal attenuator preventing stimulated Raman scattering signal from occurring by optical fiber with the second pump light shunt, the 3rd wavelength division multiplexer be connected by optical fiber with the second Raman signal attenuator and being connected with the 3rd wavelength division multiplexer is produced and the 3rd sensor fibre transmitting transducing signal, described 3rd wavelength division multiplexer is connected by the second sensor fibre with described Second Wave division multiplexer.
4. the distributed optical fiber sensing system according to claim arbitrary in claims 1 to 3, is characterized in that, described first wave division multiplexer and Second Wave division multiplexer are film filtering slice wavelength division multiplexer.
5. the distributed optical fiber sensing system according to claim 1 or 3, is characterized in that, described first Raman signal attenuator is film filtering slice formula attenuator.
6. the distributed optical fiber sensing system according to claim arbitrary in claims 1 to 3, is characterized in that, described first pump light shunt is fused tapered or planar type optical waveguide fiber optic splitter.
7. the distributed optical fiber sensing system according to claim arbitrary in claims 1 to 3, it is characterized in that, from the first pump light shunt light out through first wave division multiplexer transfer to Second Wave division multiplexer length through path from from the first pump light shunt light out through the first Raman signal attenuator transfer to Second Wave division multiplexer length through path different.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5217306A (en) * | 1991-03-02 | 1993-06-08 | Fujikura Ltd. | Temperature distribution analyzer using optical fiber |
| CN1474208A (en) * | 2002-08-07 | 2004-02-11 | 华为技术有限公司 | Method for improving pumping performance of remote pump using filter |
| CN101713689A (en) * | 2009-11-13 | 2010-05-26 | 太原市电子研究设计院 | Temperature-measuring system of distributed fibers |
| CN101979972A (en) * | 2010-09-27 | 2011-02-23 | 苏州光格设备有限公司 | Distributed optical fiber sensing system |
| CN102072741A (en) * | 2010-10-29 | 2011-05-25 | 上海华魏光纤传感技术有限公司 | Ultra-long distance distribution type optical fiber sensor and using method thereof |
-
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- 2012-07-26 CN CN201210261783.XA patent/CN103575314B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5217306A (en) * | 1991-03-02 | 1993-06-08 | Fujikura Ltd. | Temperature distribution analyzer using optical fiber |
| CN1474208A (en) * | 2002-08-07 | 2004-02-11 | 华为技术有限公司 | Method for improving pumping performance of remote pump using filter |
| CN101713689A (en) * | 2009-11-13 | 2010-05-26 | 太原市电子研究设计院 | Temperature-measuring system of distributed fibers |
| CN101979972A (en) * | 2010-09-27 | 2011-02-23 | 苏州光格设备有限公司 | Distributed optical fiber sensing system |
| CN102072741A (en) * | 2010-10-29 | 2011-05-25 | 上海华魏光纤传感技术有限公司 | Ultra-long distance distribution type optical fiber sensor and using method thereof |
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Denomination of invention: Distributed optical fiber sensing system and detection method utilizing same Effective date of registration: 20190327 Granted publication date: 20160330 Pledgee: Shanghai Pudong Development Bank Co., Ltd. Suzhou Branch Pledgor: Suzhou Guangge Equipment Co., Ltd. Registration number: 2019320010010 |
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