CN101696896B - Photoelectric device of distributed optical fiber temperature sensing system - Google Patents
Photoelectric device of distributed optical fiber temperature sensing system Download PDFInfo
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- CN101696896B CN101696896B CN2009100559221A CN200910055922A CN101696896B CN 101696896 B CN101696896 B CN 101696896B CN 2009100559221 A CN2009100559221 A CN 2009100559221A CN 200910055922 A CN200910055922 A CN 200910055922A CN 101696896 B CN101696896 B CN 101696896B
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Abstract
The invention discloses a photoelectric device of a distributed optical fiber temperature sensing system. The photoelectric device comprises a laser, an optical fiber Raman-WDM coupler, a first optical receiving module, a second optical receiving module, a first amplification matching circuit and a second amplification matching circuit, wherein the output end of the laser is connected with the input end of the optical fiber Raman-WDM coupler through an optical fiber; a feedback end of the optical fiber Raman-WDM coupler is connected with a sensing optical fiber; two output ends of the optical fiber Raman-WDM coupler are respectively connected with the first optical receiving module and the second optical receiving module; the first optical receiving module is connected with the first amplification matching circuit; and the second optical receiving module is connected with the second amplification matching circuit. The photoelectric device is used for generating optical pulses to convert backward Raman scattering optical signals carrying temperature information in the sensing optical fiber into electric signals and output the electric signals.
Description
Technical field
The present invention relates to a kind of optical fiber temperature sensing device, refer in particular to the device that light path and optical receiving circuit with distributed optical fiber temperature sensing system integrate, belong to sensory field of optic fibre.
Background technology
Distributed optical fiber temperature sensing system is a kind of new high-tech product that real-time measurement space temperature field distributes that is used for; It not only has the advantage of ordinary optic fibre sensor, also has the distributed sensing ability to the temperature of optical fiber each point along the line, utilize this characteristics we can the continuous real-time measuring optical fiber temperature of each point in several kilometers along the line; 1 meter of spatial resolution; The magnitude that bearing accuracy is 1 meter, temperature measurement accuracy can reach the level of 1 degree, are highly suitable for the application scenario of multi-point temperature measurement on a large scale.Therefore this Fibre Optical Sensor has application widely in the fixed point of temperature sensing occasion of facilities such as high voltage power cable, high-rating generator stator, high-power transformer, boiler; If because adopt traditional distributed sensor pointwise monitoring in these occasions; Difficult installation not only; And total system meeting structure is huge, uses inconvenience, and the strong electromagnetic of electric power facility also can influence measuring reliability.
Fibre optic temperature sensor commonly used at present utilizes Raman scattering to obtain temperature signal.Raman scattering (Raman scattering) when being meant light through medium because Ramam effect is claimed in the scattering that the frequency that incident light and molecular motion interaction causes changes again.Respectively there is a spectral line in the both sides of excitation line in scattering spectrum: the frequency of the curve of low frequency one end is v0-Δ v, is referred to as Stokes (Stokes) line or red satellite line; The frequency of high frequency one end curve is v0+ Δ v, is referred to as anti-Stokes (Anti-stokes) line or purple satellite line.The Chinese patent publication number is CN101344442; Open day is on January 14th, 2009, and it is exactly a kind of optical fiber temperature sensing device that utilizes the Raman scattering principle that name is called the application case of " a kind of automatic calibration type distributed optical fiber temperature measurement sensing equipment and method of application thereof " disclosed.
Yet; In distributed optical fiber temperature sensing system; The circuit part of light path part and light-receiving is dispersed placement normally; When arrangement system, will produce a large amount of problems such as trace arrangements, in the time of the operation total system, the stability of the circuit part of light path part and light-receiving, accuracy also can be affected.
Given this, be necessary to provide a kind of electrooptical device of distributed optical fiber temperature sensing system in fact, to address the above problem.
Summary of the invention
The technical matters that the present invention will solve is to provide a kind of electrooptical device of distributed optical fiber temperature sensing system; This device is used to produce light pulse; Is electric signal with having the back of temperature information in the sensor fibre to the Raman diffused light signal transition, and with this electric signal conditioning output.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of electrooptical device of distributed optical fiber temperature sensing system comprises: laser instrument, optical fiber Raman-WDM coupling mechanism, first Optical Receivers, second Optical Receivers, first amplification matching circuit, second amplification matching circuit;
Said optical fiber Raman-WDM coupling mechanism comprises an input end, and a feedback end and two output terminals are used to obtain Anti-stokes light signal and Stokes light signal; The output terminal of said laser instrument is connected through optical fiber with the input end of optical fiber Raman-WDM coupling mechanism; The feedback end of said optical fiber Raman-WDM coupling mechanism links to each other with sensor fibre; Two output terminals of optical fiber Raman-WDM coupling mechanism link to each other with second Optical Receivers with first Optical Receivers respectively, are used for exporting the Anti-stokes light signal and the Stokes light signal that obtain to first Optical Receivers and second Optical Receivers respectively;
First Optical Receivers and second Optical Receivers are used for converting Anti-stokes light signal and Stokes light signal into Anti-stokes electric signal and Stokes electric signal respectively; Said first Optical Receivers links to each other with first amplification matching circuit, in order to the Anti-stokes electric signal coupling that obtains is amplified output; Said second Optical Receivers links to each other with second amplification matching circuit, in order to the Stokes electric signal coupling that obtains is amplified output.
Further, said laser instrument is the high-power narrow pulsed light fibre laser, is used to produce the light pulse that width is 5-15ns.
Further, said optical fiber Raman-WDM coupling mechanism comprises: optical fiber circulator, Anti-stokes filter plate and Stokes filter plate;
Said optical fiber circulator comprises an input end, an output terminal and a feedback end; Its input end links to each other with the output terminal of laser instrument; Be used to receive the light pulse of laser instrument emission, its feedback end links to each other with sensor fibre, is used for injecting said light pulse to sensor fibre; And the back rear orientation light that in being transmitted in sensor fibre, produces, its output terminal is exported said rear orientation light;
Said Anti-stokes filter plate and Stokes filter plate include light input end, transmitted light output terminal and reflected light output terminal; The light input end of said Anti-stokes filter plate links to each other with the output terminal of optical fiber circulator; Its transmitted light output terminal links to each other with first Optical Receivers; Be used for separating obtaining the Anti-stokes light signal, its reflected light output terminal links to each other with the light input end of said Stokes filter plate; The transmitted light output terminal of said Stokes filter plate links to each other with second Optical Receivers, is used for separating obtaining the Stokes light signal.
Further, said optical fiber Raman-WDM coupling mechanism also comprises light collector, and it links to each other with the reflected light output terminal of said Stokes filter plate.
Further; Said first Optical Receivers comprises first photodetector and first preamplifying circuit that is attached thereto; Be used for that optical fiber Raman-WDM coupling mechanism is separated the Anti-stokes light signal that obtains and convert electric signal into; And amplification obtains Anti-stokes preamplification signal, i.e. Anti-stokes electric signal; Said second Optical Receivers comprises second photodetector and second preamplifying circuit that is attached thereto; Be used for that optical fiber Raman-WDM coupling mechanism is separated the Stokes light signal that obtains and convert electric signal into; And amplification obtains Stokes preamplification signal, i.e. Stokes electric signal.
Further, said laser instrument also comprises synchronous signal output end, is used to export synchronizing signal, and said synchronizing signal is the electric impulse signal of exporting synchronously with the light pulse of laser instrument output.
Further, also be provided with reference optical fiber ring and integrated with it temperature sensor chip between the feedback end of said sensor fibre and said optical fiber Raman-WDM coupling mechanism, be used to provide the temperature survey reference value of distributed optical fiber temperature sensing system calibration needs.
Compared to prior art, beneficial effect of the present invention is:
This device can be integrated in one with light path in the distributed optical fiber temperature sensing system and optical receiving circuit; But better protection circuit devcie; Play effects such as waterproof, fire prevention, explosion-proof, corrosion-resistant, anti-electromagnetic interference (EMI), make it have better stability and accuracy.In addition, this device also have simple in structure, volume is little, in light weight, be convenient to install, characteristics such as cost is low.
Description of drawings
Fig. 1 is the illustraton of model of the electrooptical device of distributed optical fiber temperature sensing system among the embodiment;
Fig. 2 is the structural representation of the electrooptical device of distributed optical fiber temperature sensing system;
Fig. 3 is the structural representation of optical fiber Raman-WDM coupling mechanism;
Fig. 4 is the extracting mode synoptic diagram of ordinary coupler+Raman light wave filter.
Description of symbols among the figure:
1 laser instrument
2 optical fiber Raman-WDM coupling mechanisms
21 optical fiber circulators
The 22Anti-stokes filter plate
The 23Stokes filter plate
24 light collectors
31 first Optical Receivers
32 first amplification matching circuits
41 second Optical Receivers
42 second amplification matching circuits
5 sensor fibres
6 reference optical fiber rings
7 synchronous signal output ends
Embodiment
Further specify practical implementation step of the present invention below in conjunction with accompanying drawing.
In the present embodiment, the model of the electrooptical device of distributed optical fiber temperature sensing system is as shown in Figure 1, comprises sensor fibre input port, Anti-stokes electric signal delivery outlet, Stokes electric signal delivery outlet, synchronizing signal delivery outlet.
Fig. 2 is the general structure synoptic diagram of this device, and it comprises: laser instrument 1, optical fiber Raman-WDM coupling mechanism 2, first Optical Receivers 31, second Optical Receivers 41, first amplification matching circuit 32, second amplification matching circuit 42;
Said optical fiber Raman-WDM coupling mechanism 2 comprises an input end, and a feedback end and two output terminals are used to obtain Anti-stokes light signal and Stokes light signal; The output terminal of said laser instrument 1 is connected through optical fiber with the input end of optical fiber Raman-WDM coupling mechanism 2; The feedback end of said optical fiber Raman-WDM coupling mechanism 2 links to each other with sensor fibre 5; Two output terminals of optical fiber Raman-WDM coupling mechanism 2 link to each other with second Optical Receivers 41 with first Optical Receivers 31 respectively, are used for exporting the Anti-stokes light signal and the Stokes light signal that obtain to first Optical Receivers 31 and second Optical Receivers 41 respectively;
First Optical Receivers 31 and second Optical Receivers 41 are used for converting Anti-stokes light signal and Stokes light signal into Anti-stokes electric signal and Stokes electric signal respectively; Said first Optical Receivers 31 links to each other with first amplification matching circuit 32, in order to the Anti-stokes electric signal coupling that obtains is amplified output; Said second Optical Receivers 41 links to each other with second amplification matching circuit 42, in order to the Stokes electric signal coupling that obtains is amplified output.
Further, said laser instrument 1 is the high-power narrow pulsed light fibre laser, is used to produce the light pulse that width is 5-15ns.
Further, said optical fiber Raman-WDM coupling mechanism 2 comprises: optical fiber circulator 21, Anti-stokes filter plate 22 and Stokes filter plate 23, and as shown in Figure 3;
Said optical fiber circulator 21 comprises an input end, an output terminal and a feedback end; Its input end links to each other with the output terminal of laser instrument 1; Be used to receive the light pulse of laser instrument 1 emission, its feedback end links to each other with sensor fibre 5, is used for injecting said light pulse to sensor fibre 5; And the rear orientation light of back generation in being transmitted in sensor fibre 5, its output terminal is exported said rear orientation light;
Said Anti-stokes filter plate 22 and Stokes filter plate 23 include light input end, transmitted light output terminal and reflected light output terminal; The light input end of said Anti-stokes filter plate 22 links to each other with the output terminal of optical fiber circulator 21; Its transmitted light output terminal links to each other with first Optical Receivers 31; Be used for separating obtaining the Anti-stokes light signal, its reflected light output terminal links to each other with the light input end of said Stokes filter plate 23; The transmitted light output terminal of said Stokes filter plate 23 links to each other with second Optical Receivers 41, is used for separating obtaining the Stokes light signal.
Further, said optical fiber Raman-WDM coupling mechanism 2 also comprises light collector 24, and it links to each other with the reflected light output terminal of said Stokes filter plate 23.
Further; Said first Optical Receivers 31 comprises first photodetector and first preamplifying circuit that is attached thereto; Be used for that optical fiber Raman-WDM coupling mechanism 2 is separated the Anti-stokes light signal that obtains and convert electric signal into; And amplification obtains Anti-stokes preamplification signal, i.e. Anti-stokes electric signal; Said second Optical Receivers 41 comprises second photodetector and second preamplifying circuit that is attached thereto; Be used for that optical fiber Raman-WDM coupling mechanism 2 is separated the Stokes light signal that obtains and convert electric signal into; And amplification obtains Stokes preamplification signal, i.e. Stokes electric signal.
Further, said laser instrument 1 also comprises synchronous signal output end 7, with the synchronizing signal delivery outlet output of synchronizing signal via crust of the device.Said synchronizing signal is and the light pulse of the laser instrument output electric impulse signal of output synchronously, it can notify external D collector begin D signals collecting.Trigger mode can be divided into outer synchronous, two kinds of patterns of internal trigger.
Further; Also be provided with reference optical fiber ring 6 and integrated with it temperature sensor chip between the feedback end of said sensor fibre 5 and said optical fiber Raman-WDM coupling mechanism 2; Be used to provide the temperature survey reference value of distributed optical fiber temperature sensing system calibration needs, can carry out sampling correction for improving system stability.
During the practical implementation of this device:
Adopt the backscatter sounding method, produce very narrow light pulse, i.e. probe pulse launched by fiber laser.The width of probe pulse launched has been confirmed the spatial resolution of distributed optical fiber temperature sensing system; Photo-detector is the contribution summation of the back scattering luminous energy of the one section optical fiber corresponding with light impulse length in the luminous energy that detects sometime, has therefore just determined a spatial resolution by light impulse length.General light impulse length is 5-15ns, is preferably 10ns; Repetition frequency: adjustable in 1khz～10kHz, degree of regulation 1kHz; Light pulse peak power: 15W.Light pulse is through the incident end of Optical Fiber Transmission to optical fiber Raman-WDM coupling mechanism; Get into sensor fibre again; The rear orientation light that in sensor fibre, produces separates (optical fiber Raman-WDM coupling mechanism includes Anti-stokes filter plate, Stokes filter plate) through optical fiber Raman-WDM coupling mechanism again; What obtain carrying temperature signal after the separation is back to anti-Stokes Raman diffused light and signal back to the Stokes Raman diffused light as a reference, has just accomplished the reception work of light signal since then.Wherein, Anti-stokes scattered light and stokes scattering light wavelength are by the centre wavelength decision of laser instrument.
The back Stokes Raman diffused light of separating from the Anti-stokes filter plate of separating to anti-Stokes Raman diffused light and Stokes filter plate gets into first photodetector respectively again and second photodetector carries out opto-electronic conversion; Amplify through preamplifying circuit again, thus the photodetection work of completion signal.This moment, signal became the level form by the luminous power formal transformation, got into first amplification matching circuit respectively again and second amplification matching circuit amplifies voltage signal, and finally obtaining magnitude of voltage is 1V
PPRaman scattering signal Anti-stokes and Stokes electric signal, output voltage values and external D the analog input of collector be complementary.
Said optical fiber Raman-WDM coupling mechanism, it receives light pulse, is injected in the sensor fibre through optical fiber circulator, and the rear orientation light that in sensor fibre, produces carries out light filtering and separates through optical fiber Raman-WDM coupling mechanism again.Compare with the extracting mode of the Raman light signal of traditional ordinary coupler+optical filter, this mode using light extraction efficiency is higher.Structural representation such as Fig. 3 of optical fiber Raman-WDM coupling mechanism.Extracting mode such as Fig. 4 of ordinary coupler+Raman light wave filter.
This device is integrated in one with light path in the distributed optical fiber temperature sensing system and optical receiving circuit; When arrangement system, be convenient to more install; In the time of the operation total system, because the circuit part of light path part and light-receiving is integrated in one, but the better protection circuit devcie; Play effects such as waterproof, fire prevention, explosion-proof, corrosion-resistant, anti-electromagnetic interference (EMI), make it have better stability and accuracy.
Here description of the invention and application is illustrative, is not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of the embodiment that is disclosed and change are possible, and the replacement of embodiment is known with the various parts of equivalence for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present invention or essential characteristic, and the present invention can be with other forms, structure, layout, ratio, and realize with other elements, material and parts.Under the situation that does not break away from the scope of the invention and spirit, can carry out other distortion and change here to the embodiment that is disclosed.
Claims (5)
1. the electrooptical device of a distributed optical fiber temperature sensing system; It is characterized in that this device comprises: laser instrument (1), optical fiber Raman-WDM coupling mechanism (2), first Optical Receivers (31), second Optical Receivers (41), first amplification matching circuit (32), second amplification matching circuit (42);
Said optical fiber Raman-WDM coupling mechanism (2) comprises an input end, and a feedback end and two output terminals are used to obtain Anti-stokes light signal and Stokes light signal; The output terminal of said laser instrument (1) is connected through optical fiber with the input end of optical fiber Raman-WDM coupling mechanism (2); The feedback end of said optical fiber Raman-WDM coupling mechanism (2) links to each other with sensor fibre (5); Two output terminals of optical fiber Raman-WDM coupling mechanism (2) link to each other with second Optical Receivers (41) with first Optical Receivers (31) respectively, are used for exporting the Anti-stokes light signal and the Stokes light signal that obtain to first Optical Receivers (31) and second Optical Receivers (41) respectively;
First Optical Receivers (31) and second Optical Receivers (41) are used for converting Anti-stokes light signal and Stokes light signal into Anti-stokes electric signal and Stokes electric signal respectively; Said first Optical Receivers (31) links to each other with first amplification matching circuit (32), in order to the Anti-stokes electric signal coupling that obtains is amplified output; Said second Optical Receivers (41) links to each other with second amplification matching circuit (42), in order to the Stokes electric signal coupling that obtains is amplified output;
Said optical fiber Raman-WDM coupling mechanism (2) comprising: optical fiber circulator (21), Anti-stokes filter plate (22) and Stokes filter plate (23);
Said optical fiber circulator (21) comprises an input end, an output terminal and a feedback end; Its input end links to each other with the output terminal of laser instrument (1); Be used to receive the light pulse of laser instrument (1) emission, its feedback end links to each other with sensor fibre (5), is used for injecting said light pulse to sensor fibre (5); And the rear orientation light of back generation in being transmitted in sensor fibre (5), its output terminal is exported said rear orientation light;
Said Anti-stokes filter plate (22) and Stokes filter plate (23) include light input end, transmitted light output terminal and reflected light output terminal; The light input end of said Anti-stokes filter plate (22) links to each other with the output terminal of optical fiber circulator (21); Its transmitted light output terminal links to each other with first Optical Receivers (31); Be used for separating obtaining the Anti-stokes light signal, its reflected light output terminal links to each other with the light input end of said Stokes filter plate (23); The transmitted light output terminal of said Stokes filter plate (23) links to each other with second Optical Receivers (41), is used for separating obtaining the Stokes light signal;
Said optical fiber Raman-WDM coupling mechanism (2) also comprises light collector (24), and its reflected light output terminal with said Stokes filter plate (23) links to each other.
2. the electrooptical device of distributed optical fiber temperature sensing system according to claim 1, it is characterized in that: said laser instrument (1) is the high-power narrow pulsed light fibre laser, is used to produce the light pulse that width is 5-15ns.
3. the electrooptical device of distributed optical fiber temperature sensing system according to claim 1; It is characterized in that: said first Optical Receivers (31) comprises first photodetector and first preamplifying circuit that is attached thereto; Be used for that optical fiber Raman-WDM coupling mechanism (2) is separated the Anti-stokes light signal that obtains and convert electric signal into; And amplification obtains Anti-stokes preamplification signal, i.e. Anti-stokes electric signal; Said second Optical Receivers (41) comprises second photodetector and second preamplifying circuit that is attached thereto; Be used for that optical fiber Raman-WDM coupling mechanism (2) is separated the Stokes light signal that obtains and convert electric signal into; And amplification obtains Stokes preamplification signal, i.e. Stokes electric signal.
4. the electrooptical device of distributed optical fiber temperature sensing system according to claim 1; It is characterized in that: said laser instrument (1) also comprises synchronous signal output end (7); Be used to export synchronizing signal, said synchronizing signal is the electric impulse signal of exporting synchronously with the light pulse of laser instrument (1) output.
5. the electrooptical device of distributed optical fiber temperature sensing system according to claim 1; It is characterized in that: also be provided with reference optical fiber ring (6) and integrated with it temperature sensor chip between the feedback end of said sensor fibre (5) and said optical fiber Raman-WDM coupling mechanism (2), be used to provide the temperature survey reference value of distributed optical fiber temperature sensing system calibration needs.
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| CN2009100559221A CN101696896B (en) | 2009-08-05 | 2009-08-05 | Photoelectric device of distributed optical fiber temperature sensing system |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101207345B1 (en) * | 2010-08-05 | 2012-12-05 | 한국표준과학연구원 | Optic fiber distributed temperature sensor system with self- correction function and temperature measuring method using thereof |
| CN102081197B (en) * | 2010-11-11 | 2013-02-27 | 金海新源电气江苏有限公司 | Wavelength division multiplexer |
| CN102062648A (en) * | 2010-11-11 | 2011-05-18 | 金海新源电气江苏有限公司 | Wavelength division multiplexing device for distributed optical fiber temperature sensor |
| CN102680137B (en) * | 2012-06-07 | 2014-08-13 | 北京航空航天大学 | Cascading distributed fiber Raman temperature measuring system |
| CN103278261B (en) * | 2013-06-12 | 2015-01-07 | 杭州山旭光电有限公司 | High-stability distributed type fiber temperature detection device and calibration method |
| CN105043586B (en) * | 2015-05-28 | 2018-01-09 | 华中科技大学 | A kind of Raman distributed temp measuring system and temp measuring method based on less fundamental mode optical fibre |
| CN105136337A (en) * | 2015-05-28 | 2015-12-09 | 华中科技大学 | Raman distributed temperature measurement system based on mode multiplexing and temperature measurement method |
| CN107843356A (en) * | 2017-10-26 | 2018-03-27 | 中国兵器装备集团上海电控研究所 | A kind of temperature field system based on distribution type fiber-optic |
| CN110702625A (en) * | 2019-10-16 | 2020-01-17 | 安徽中科智泰光电测控科技有限公司 | Coal mine spontaneous ignition prevention monitoring system based on optical fiber sensing and laser spectrum analysis |
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| CN1400453A (en) * | 2001-07-27 | 2003-03-05 | 中国计量学院 | Distributed optical fibre temperature sensor system |
| CN2896250Y (en) * | 2006-05-15 | 2007-05-02 | 四川莱威科技有限公司 | Distribution-type optical-fiber temperature sensor |
| CN101256098A (en) * | 2008-03-14 | 2008-09-03 | 秦一涛 | Method for measuring temperature of distributed optical fiber temperature transducer system |
| CN101261164A (en) * | 2007-03-08 | 2008-09-10 | 电子科技大学 | Juxtaposed distributed optical fibre temperature sensor |
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| CN1400453A (en) * | 2001-07-27 | 2003-03-05 | 中国计量学院 | Distributed optical fibre temperature sensor system |
| CN2896250Y (en) * | 2006-05-15 | 2007-05-02 | 四川莱威科技有限公司 | Distribution-type optical-fiber temperature sensor |
| CN101261164A (en) * | 2007-03-08 | 2008-09-10 | 电子科技大学 | Juxtaposed distributed optical fibre temperature sensor |
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