CN102853857A - Long-distance optical fiber Brillouin optical time-domain analyzer - Google Patents
Long-distance optical fiber Brillouin optical time-domain analyzer Download PDFInfo
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Abstract
The invention discloses a long-distance optical fiber Brillouin optical time-domain analyzer which comprises sensing optical fiber, main equipment mainly comprising a detection light source, a frequency measurement, a signal output module, a main equipment controller and a first remote communication module, and slave equipment comprising mainly comprising a pumping light source, a polarization scrambler, a slave equipment controller and a second remote communication module; the main equipment and the slave equipment are positioned at the two ends of the sensing optical fiber; frequency measurement of continuous light output by the detection light source and the pumping light source as well as receiving of backscattering signal of the sensing optical fiber can be realized through the frequency measurement and the signal output module of the main equipment; and the slave equipment is controlled through the communication and interaction of the first remote communication module and the second remote communication module. The long-distance optical fiber Brillouin optical time-domain analyzer has the advantages that under the premise of not sacrificing spatial resolution, measuring accuracy and measuring time, the measuring distance can be effectively increased by one time, the maximal measuring distance can reach more than 120 kilometers, and the application range of the optical fiber Brillouin optical time-domain analyzer is effectively enlarged.
Description
Technical field
The present invention relates to a kind of distributed fiberoptic sensor, especially relate to a kind of long-distance optical fiber Brillouin light time domain analyzer.
Background technology
Distributed fiberoptic sensor has a wide range of applications in the security monitoring in the fields such as power equipment, civil engineering work, water conservancy projects and communications optical cable.Have based on the distributed fiberoptic sensor of Brillouin scattering that measuring distance is long, measuring accuracy is high, and can realize the advantages such as temperature and stress measurement, therefore enjoy people to pay close attention to.The optical fiber Brillouin sensing technology mainly comprises following two classes: Brillouin light Time Domain Reflectometry (BOTDR, Brillouin Opitcal Time Domain Reflectometry) technology and Brillouin optical time domain analysis (BOTDA, Brillouin Opitcal Time Domain Analysis) technology.Wherein, the Brillouin light time domain reflection technology is single-ended measurement, and it surveys faint spontaneous brillouin scattering light, therefore is difficult to realize long range measurements; The Brillouin optical time domain analysis technology then is double-end measurement, and it surveys stronger stimulated Brillouin scattering light, so measuring distance all is better than the Brillouin light time domain reflection technology with measuring accuracy, is the optical fiber sensing technology of present tool application prospect.
Brillouin light time domain analyzer is to utilize the interaction of pump light and detection light to realize distributed temperature, strain sensing.Be to realize pump light and survey control and the frequency sweeping of light, existing Brillouin light time domain analyzer all is arranged at pump light source and probe source one side of sensor fibre, and sensor fibre adopts U-shaped round configuration (loop structure).Like this, pump light and detection light all need experience the fiber lengths that doubles distance sensing could be realized measuring, particularly, if realize the distance sensing of 50km, then pump light and detection light need experience the fiber lengths of 100km, energy and Measuring Time that this has not only wasted pump light and has surveyed light, more crucial is limited by fiber nonlinear effect, along with the increase of fiber lengths, the input optical power of pump light is restricted, thereby has affected the measuring accuracy of sensor.
For the long-distance optical fiber Brillouin light time domain analyzer, the correlative study report is also arranged at present, in the SPIE meeting paper, introduce the Brillouin light time domain analyzer that utilizes the pulse code technology such as people such as Canadian X. Bao and can improve measurement length and spatial resolution, can realize the 50km measuring distance, high-acruracy survey (the X.Bao of 1m spatial resolution, H.Liang, Y.Dong, W.Li, Y.Li, and L.Chen, " Pushing the limit of the distributed Brillouin sensors for the sensing length and the spatial resolution ", Proceedings of SPIE, vol. 7677, pp. 767702-767702-13,2010).In addition, the people such as Hispanic Marcelo A. Soto utilize similar techniques to realize Brillouin light time domain analyzer (the Marcelo A. Soto of loop (i.e. the conventional U-shaped round configuration of sensor fibre) 120km, Gabriele Bolognini, and Fabrizio Di Pasquale, " Long-range simplex-coded BOTDA sensor over 120km distance employing optical preamplification ", Optics Letters, vol. 36, Issue 2, pp. 232-234,2011), its maximum measuring distance will be no more than 60km, be the mxm. of reporting at present.
Power overhead network, long oil and gas pipeline belong to great infrastructure, and its operation security involves the interests of the state and the people, and need novel on-line monitoring technique badly.No matter be power overhead network or long oil and gas pipeline, its node is very long, and typical monitoring distance is 80km, have in addition surpass 120km, yet the Brillouin light time domain analyzer of the conventional U-shaped round configuration of sensor fibre can't satisfy this monitoring requirements.
Summary of the invention
Technical matters to be solved by this invention provides a kind of long-distance optical fiber Brillouin light time domain analyzer, and it can effectively increase the distance sensing of system, and does not sacrifice spatial resolution and measuring accuracy.
The present invention solves the problems of the technologies described above the technical scheme that adopts: a kind of long-distance optical fiber Brillouin light time domain analyzer, it is characterized in that comprising sensor fibre, mainly by probe source, frequency measurement and signal output module, the main equipment controller, the main equipment that the first remote communication module forms and mainly by pump light source, scrambler, from device controller, the second remote communication module form from equipment, the output terminal of described probe source is connected with the input end of described frequency measurement and signal output module, the output terminal of described frequency measurement and signal output module is connected with an end of described sensor fibre, described main equipment controller respectively with described probe source, described frequency measurement and signal output module, described the first remote communication module is connected, the output terminal of described pump light source is connected with the input end of described scrambler, the output terminal of described scrambler is connected with the other end of described sensor fibre, described from device controller respectively with described pump light source, described scrambler, described the second remote communication module is connected, described the first remote communication module and described the second remote communication module communication interaction; Described frequency measurement and signal output module are used for the backscatter signals that continuous light to described probe source and the output of described pump light source carries out frequency measurement and the continuous light of described probe source output is modulated into pulsed light and receives described sensor fibre.
Described the first remote communication module is for wireless communication module independently or for being embedded at the wireless communication module in the described main equipment controller, described the second remote communication module is for wireless communication module independently or for being embedded at described wireless communication module from device controller, described main equipment and described mutual with the wireless mode telecommunication by described the first remote communication module and described the second remote communication module from equipment.
Further, described the first remote communication module and described the second remote communication module are the optical fiber telecommunications module, described main equipment and described mutual with the wired mode telecommunication by described the first remote communication module and described the second remote communication module from equipment, described the first remote communication module comprises the first light wavelength division multiplexing and the first fiber optical transceiver, described the second remote communication module comprises the second light wavelength division multiplexing and the second fiber optical transceiver, described the first light wavelength division multiplexing and described the second light wavelength division multiplexing all have three input ends and an output terminal, described the first fiber optical transceiver and described the second fiber optical transceiver all have a control end and a Laser emission end and a signal receiving end, or all have a control end and Laser emission and signal and receive common terminal, an input end of described the first light wavelength division multiplexing is connected with the output terminal of described frequency measurement and signal output module, in addition two input ends of described the first light wavelength division multiplexing and the Laser emission end connection corresponding to signal receiving end of described the first fiber optical transceiver, or all be connected with signal reception common terminal with the Laser emission of described the first fiber optical transceiver, the output terminal of described the first light wavelength division multiplexing is connected with an end of described sensor fibre, the control end of described the first fiber optical transceiver is connected with described main equipment controller, an input end of described the second light wavelength division multiplexing is connected with the output terminal of described scrambler, in addition two input ends of described the second light wavelength division multiplexing and the Laser emission end connection corresponding to signal receiving end of described the second fiber optical transceiver, or all be connected with signal reception common terminal with the Laser emission of described the second fiber optical transceiver, the output terminal of described the second light wavelength division multiplexing is connected with the other end of described sensor fibre, and the control end of described the second fiber optical transceiver is connected from device controller with described; At this, utilize the first light wavelength division multiplexing and the second light wavelength division multiplexing with on optical fiber Brillouin sensing part and optical fiber communication fractional reuse to a sensor fibre, not only save fiber resource, and improved fiber utilization.
As preferably, the Laser emission end of described the first fiber optical transceiver is not identical with the wavelength of the Laser emission end of described the second fiber optical transceiver; At this moment, can realize by the first light wavelength division multiplexing and the second light wavelength division multiplexing the two-way interactive of two fiber optical transceivers (i.e. the first fiber optical transceiver and the second fiber optical transceiver) at same optical fiber, save fiber resource.
Described frequency measurement and signal output module comprise the first fiber coupler, pulse-modulator, optical circulator, the second fiber coupler, the 3rd fiber coupler, frequency detector and photoelectric switching circuit, described the first fiber coupler has an input end and two output terminals, described the second fiber coupler and described the 3rd fiber coupler all have two input ends and an output terminal, described optical circulator has three ports, the input end of described the first fiber coupler is connected with the output terminal of described probe source, an output terminal of described the first fiber coupler is connected with the input end of described pulse-modulator, another output terminal of described the first fiber coupler is connected with an input end of described the 3rd fiber coupler, the output terminal of described pulse-modulator is connected with first port of described optical circulator, second port of described optical circulator is connected with an input end of described the second fiber coupler, the 3rd port of described optical circulator is connected with the input end of described photoelectric switching circuit, another input end of described the second fiber coupler is connected with another input end of described the 3rd fiber coupler, the output terminal of described the second fiber coupler is connected with an end of described sensor fibre, the output terminal of described the 3rd fiber coupler is connected with the input end of described frequency detector, the output terminal of described frequency detector be connected the output terminal of photoelectric switching circuit and be connected with described main equipment controller respectively.
As preferably, be provided with image intensifer between described the second fiber coupler and described the 3rd fiber coupler, another input end of described the second fiber coupler is connected with the input end of described image intensifer, and the output terminal of described image intensifer is connected with another input end of described the 3rd fiber coupler; At this, because after the continuous light that the pump light source from equipment is sent transmitted through long-distance optical fiber, the signal energy decay was larger, and therefore an image intensifer is set between the second fiber coupler and the 3rd fiber coupler, after signal amplifies through image intensifer like this, more be conducive to frequency sonding.
As preferably, in described probe source and the described pump light source one is that the adjustable narrow linewidth laser of frequency and another are the fixing narrow linewidth laser of frequency.
As preferably, long-distance optical fiber Brillouin light time domain analyzer of the present invention also comprises a telecommunication optical fiber that walks abreast and arrange with described sensor fibre, described the first remote communication module and described the second remote communication module are the optical fiber telecommunications module, described main equipment and described mutual with the wired mode telecommunication by described the first remote communication module and described the second remote communication module from equipment, described the first remote communication module comprises the first light wavelength division multiplexing and the first fiber optical transceiver, described the second remote communication module comprises the second light wavelength division multiplexing and the second fiber optical transceiver, described the first light wavelength division multiplexing and described the second light wavelength division multiplexing all have two input ends and an output terminal, described the first fiber optical transceiver and described the second fiber optical transceiver all have a control end and a Laser emission end and a signal receiving end, or all have a control end and Laser emission and signal and receive common terminal, two input ends of described the first light wavelength division multiplexing and the Laser emission end connection corresponding to signal receiving end of described the first fiber optical transceiver, or all be connected with signal reception common terminal with the Laser emission of described the first fiber optical transceiver, the output terminal of described the first light wavelength division multiplexing is connected with an end of described telecommunication optical fiber, the control end of described the first fiber optical transceiver is connected with described main equipment controller, two input ends of described the second light wavelength division multiplexing and the Laser emission end connection corresponding to signal receiving end of described the second fiber optical transceiver, or all be connected with signal reception common terminal with the Laser emission of described the second fiber optical transceiver, the output terminal of described the second light wavelength division multiplexing is connected with the other end of described telecommunication optical fiber, and the control end of described the second fiber optical transceiver is connected from device controller with described; At this and since the two ends of sensor fibre not with the first light wavelength division multiplexing be connected light wavelength division multiplexing and be connected, therefore can effectively reduce the optical fiber link loss, the backscatter signals of raising sensor fibre tail end can further improve the measuring accuracy of system.
As preferably, long-distance optical fiber Brillouin light time domain analyzer of the present invention, also be provided with the 3rd input end at described the first light wavelength division multiplexing and described the second light wavelength division multiplexing, be provided with the 4th fiber coupler between the other end of described scrambler and described sensor fibre, described the 4th fiber coupler has an input end and two output terminals, the output terminal of described scrambler is connected with the input end of described the 4th fiber coupler, an output terminal of described the 4th fiber coupler is connected with the other end of described sensor fibre, another output terminal of described the 4th fiber coupler is connected with the 3rd input end of described the second light wavelength division multiplexing, described frequency measurement and signal output module comprise the first fiber coupler, pulse-modulator, optical circulator, the 3rd fiber coupler, frequency detector and photoelectric switching circuit, described the first fiber coupler has an input end and two output terminals, described the 3rd fiber coupler has two input ends and an output terminal, described optical circulator has three ports, the input end of described the first fiber coupler is connected with the output terminal of described probe source, an output terminal of described the first fiber coupler is connected with the input end of described pulse-modulator, another output terminal of described the first fiber coupler is connected with an input end of described the 3rd fiber coupler, the output terminal of described pulse-modulator is connected with first port of described optical circulator, second port of described optical circulator is connected with an end of described sensor fibre, the 3rd port of described optical circulator is connected with the input end of described photoelectric switching circuit, another input end of described the 3rd fiber coupler is connected with the 3rd input end of described the first light wavelength division multiplexing, the output terminal of described the 3rd fiber coupler is connected with the input end of described frequency detector, the output terminal of described frequency detector be connected the output terminal of photoelectric switching circuit and be connected with described main equipment controller respectively; At this, optical fiber Brillouin sensing partly requires the power of pump light source can not be too large; The frequency sonding part then requires the power of pump light source higher, the continuous light that therefore pump light source from equipment is sent enters telecommunication optical fiber after the 4th fiber coupler light splitting, be optical fiber of frequency measurement and optical fiber telecommunications fractional reuse, the optical fiber Brillouin sensing part takies separately an optical fiber, so both can improve the backscatter signals of sensor fibre tail end, thereby improve the measuring accuracy of system, can improve again the accuracy of frequency measurement.
As preferably, be provided with image intensifer between described the 3rd fiber coupler and described the first light wavelength division multiplexing, the 3rd input end of described the first light wavelength division multiplexing is connected with the input end of described image intensifer, and the output terminal of described image intensifer is connected with another input end of described the 3rd fiber coupler.
Compared with prior art, the invention has the advantages that:
1) optical fiber Brillouin light time domain analyzer of the present invention places pump light source and probe source at the two ends of long-distance sensing optical fiber, frequency measurement and signal output module by main equipment realize the frequency measurement of the continuous light that probe source and pump light source are exported and the backscatter signals that receives sensor fibre, and by the first remote communication module and the second remote communication module communication interaction realize control from equipment, do not sacrificing spatial resolution like this, under the prerequisite of measuring accuracy and Measuring Time, can effectively increase effective measuring distance (can increase by 1 times), maximum measuring distance can reach more than 120 kilometers, thereby effectively enlarged the scope of application of optical fiber Brillouin light time domain analyzer, can satisfy well power overhead network, the monitoring requirements of the great infrastructure such as long oil and gas pipeline.
2) the optical fiber Brillouin light time domain analyzer utilization of the present invention optical fiber telecommunications module that contains light wavelength division multiplexing realizes that optical fiber Brillouin sensing and optical fiber communication are multiplexing, and multiplexed form can be according to measuring distance and application operating mode flexible configuration, and is easy to operate.
3) optical fiber Brillouin light time domain analyzer of the present invention is simple in structure, realizes that cost is low.
Description of drawings
Fig. 1 is the general structure schematic diagram of long-distance optical fiber light time domain analysis device of the present invention;
Fig. 2 is the structural representation of the optical fiber Brillouin light time domain analyzer of the embodiment of the invention one;
Fig. 3 is the structural representation of the optical fiber Brillouin light time domain analyzer of the embodiment of the invention two;
Fig. 4 is frequency measurement in the optical fiber Brillouin light time domain analyzer of the embodiment of the invention one and embodiment two and the structural representation of signal output module;
Fig. 5 increases the new frequency measurement that forms behind the image intensifer and the structural representation of signal output module among Fig. 4;
Fig. 6 is the structural representation of the optical fiber Brillouin light time domain analyzer of the embodiment of the invention three;
Fig. 7 is the structural representation of the optical fiber Brillouin light time domain analyzer of the embodiment of the invention four.
Embodiment
Embodiment is described in further detail the present invention below in conjunction with accompanying drawing.
Embodiment one:
A kind of long-distance optical fiber Brillouin light time domain analyzer that the present embodiment proposes, such as Fig. 1, Fig. 2, Fig. 4 and shown in Figure 5, it comprises sensor fibre 3, mainly by probe source 102, frequency measurement and signal output module 103, main equipment controller 104, the main equipment 1 that the first remote communication module 101 forms and mainly by pump light source 202, scrambler 203, from device controller 204, the second remote communication module 201 form from equipment 2, the output terminal of probe source 102 is connected with the input end of frequency measurement and signal output module 103, the output terminal of frequency measurement and signal output module 103 is connected with an end of sensor fibre 3, main equipment controller 104 respectively with probe source 102, frequency measurement and signal output module 103, the first remote communication module 101 is connected, probe source 102, frequency measurement and signal output module 103, the first remote communication module 101 is by 104 controls of main equipment controller, the output terminal of pump light source 202 is connected with the input end of scrambler 203, the output terminal of scrambler 203 is connected with the other end of sensor fibre 3, from device controller 204 respectively with pump light source 202, scrambler 203, the second remote communication module 201 is connected, pump light source 202, scrambler 203, the second remote communication module 201 is by controlling the first remote communication module 101 and the second remote communication module 201 communication interactions from device controller 204.At this, frequency measurement and signal output module 103 are carried out frequency measurement for the continuous light that continuous light and the pump light source 202 of probe source 102 outputs are exported and the continuous light of probe source 102 outputs are modulated into the backscatter signals of pulsed light and reception sensor fibre 3.
In this specific embodiment, as shown in Figure 2, the first remote communication module 101 and the second remote communication module 201 are the optical fiber telecommunications module, main equipment 1 and mutual with wired mode (namely by sensor fibre 3) telecommunication by the first remote communication module 101 and the second remote communication module 201 from equipment 2, the first remote communication module 101 comprises the first light wavelength division multiplexing 1011 and the first fiber optical transceiver 1012, the second remote communication module 201 comprises the second light wavelength division multiplexing 2011 and the second fiber optical transceiver 2012, the first light wavelength division multiplexing 1011 and the second light wavelength division multiplexing 2011 all have three input ends and an output terminal, the first fiber optical transceiver 1012 and the second fiber optical transceiver 2012 all have a control end and a Laser emission end and a signal receiving end, the output terminal of the second fiber coupler 1034 in input end of the first light wavelength division multiplexing 1011 and frequency measurement and the signal output module 103 is connected, in addition two input ends of the first light wavelength division multiplexing 1011 and Laser emission end and the signal receiving end of the first fiber optical transceiver 1012 connect one to one, the output terminal of the first light wavelength division multiplexing 1011 is connected with an end of sensor fibre 3, the control end of the first fiber optical transceiver 1012 is connected with main equipment controller 104, an input end of the second light wavelength division multiplexing 2011 is connected with the output terminal of scrambler 203, in addition two input ends of the second light wavelength division multiplexing 2011 and Laser emission end and the signal receiving end of the second fiber optical transceiver 2012 connect one to one, the output terminal of the second light wavelength division multiplexing 2011 is connected with the other end of sensor fibre 3, the control end of the second fiber optical transceiver 2012 be connected from device controller 204.
At this, the first fiber optical transceiver 1012 and the second fiber optical transceiver 2012 have all adopted the fiber optical transceiver with a control end, a Laser emission end and a signal receiving end, and the Laser emission end of the first fiber optical transceiver 1012 is not identical with the wavelength of the Laser emission end of the second fiber optical transceiver 2012, particularly, when the Laser emission end of the first fiber optical transceiver 1012 when to select centre wavelength be near the 1310nm semiconductor laser, then can to select centre wavelength be near the 1490nm semiconductor laser to the Laser emission end of the second fiber optical transceiver 2012.
At this, the first fiber optical transceiver 1012 and the second fiber optical transceiver 2012 also can all adopt has the fiber optical transceiver that a control end and Laser emission and signal receive common terminal, be that Laser emission end and signal receiving end are merged into a common terminal, fiber optical transceiver inside was preset a wavelength-division multiplex diaphragm and (was reflected with 1310nm this moment, 1490nm is by being example), an output terminal during connection in other two input ends of the first light wavelength division multiplexing 1011 receives common terminal with the Laser emission of the first fiber optical transceiver 1012 with signal and is connected, an output in other two input ends of the second light wavelength division multiplexing 2011 receives common terminal with the Laser emission of the second fiber optical transceiver 2012 with signal and is connected, namely the laser (take 1310nm as example) that sends of the Laser emission end of the first fiber optical transceiver 1012 reflexes to Laser emission and signal receives common terminal through the first fiber optical transceiver 1012 built-in wavelength-division multiplex diaphragms, and through the first light wavelength division multiplexing 1011, the Laser emission and the signal that enter the second fiber optical transceiver 2012 behind sensor fibre 3 and the second light wavelength division multiplexing 2011 receive common terminal, and the wavelength-division multiplex diaphragm that is then preset by the second fiber optical transceiver 2012 inside reflexes to signal receiving end; In like manner, the laser that the Laser emission end of the second fiber optical transceiver 2012 sends (take 1490nm as example) is transmitted through Laser emission and signal reception common terminal through the second fiber optical transceiver 2012 built-in wavelength-division multiplex diaphragms, and the Laser emission and the signal reception common terminal that behind the second light wavelength division multiplexing 2011, sensor fibre 3 and the first light wavelength division multiplexing 1011, enter the first fiber optical transceiver 1012, the wavelength-division multiplex diaphragm that is then preset by the first fiber optical transceiver 1012 inside is transmitted through signal receiving end.
At this, the communication interaction that the first fiber optical transceiver 1012 and the second fiber optical transceiver 2012 are used between the equipment at sensor fibre 3 two ends, but Real-time Obtaining modules information, and carry out corresponding control.
In this specific embodiment, frequency measurement and signal output module 103 are as shown in Figure 4, it comprises the first fiber coupler 1031, pulse-modulator 1032, optical circulator 1033, the second fiber coupler 1034, the 3rd fiber coupler 1035, frequency detector 1036 and photoelectric switching circuit 1037, the first fiber coupler 1031 has an input end and two output terminals, the second fiber coupler 1034 and the 3rd fiber coupler 1035 all have two input ends and an output terminal, optical circulator 1033 has three ports, the input end of the first fiber coupler 1031 is connected with the output terminal of probe source 102, an output terminal of the first fiber coupler 1031 is connected with the input end of pulse-modulator 1032, another output terminal of the first fiber coupler 1031 is connected with an input end of the 3rd fiber coupler 1035, the output terminal of pulse-modulator 1032 is connected with first port of optical circulator 1033, second port of optical circulator 1033 is connected with an input end of the second fiber coupler 1034, the 3rd port of optical circulator 1033 is connected with the input end of photoelectric switching circuit 1037, another input end of the second fiber coupler 1034 is connected with another input end of the 3rd fiber coupler 1035, the output terminal of the second fiber coupler 1034 is connected with an end of sensor fibre 3 by the first light wavelength division multiplexing 1011 of the first remote communication module 101, namely the first light wavelength division multiplexing 1011 input end is connected with the output terminal of the second fiber coupler 1034, also be the output terminal of the second fiber coupler 1034 and an end indirect joint of sensor fibre 3, the output terminal of the 3rd fiber coupler 1035 is connected with the input end of frequency detector 1036, and the output terminal that the output terminal of frequency detector 1036 is connected with photoelectric switching circuit is connected with main equipment controller 104 respectively.
In this specific embodiment, in frequency measurement shown in Figure 4 and signal output module 103, also can between the second fiber coupler 1034 and the 3rd fiber coupler 1035, be provided with image intensifer 1038, as shown in Figure 5, another input end of the second fiber coupler 1034 is connected with the input end of image intensifer 1038, and the output terminal of image intensifer 1038 is connected with another input end of the 3rd fiber coupler 1035; At this, increased and to have amplified the continuous light that sends because of the pump light source 202 that produces decay through long Distance Transmission behind the image intensifer 1038, thereby can increase the accuracy of frequency measurement.
In this specific embodiment, in probe source 102 and the pump light source 202 one is that the adjustable narrow linewidth laser of frequency and another are the fixing narrow linewidth laser of frequency, if namely probe source 102 is the adjustable laser instrument of frequency, then pump light source 202 is the fixing laser instrument of frequency, if pump light source 202 is the adjustable laser instrument of frequency, then probe source 102 is the fixing laser instrument of frequency.At this, narrow linewidth laser can be selected narrow linewidth semiconductor laser, also can select narrow cable and wide optical fiber laser.In the present embodiment, probe source 102 is selected the low noise narrow linewidth semiconductor laser, and centre wavelength is 1550.12nm, and power is 10mW; Pump light source 202 is selected the low noise narrow linewidth semiconductor laser, and centre wavelength is 1550.20nm, and power is 10mW.
In the present embodiment, scrambler 203 adopts prior art; The first light wavelength division multiplexing 1011 and the second light wavelength division multiplexing 2011 are conventional fiber optic passive device, the optical maser wavelength of the optical maser wavelength of the optical maser wavelength of separable, multiplexing the first fiber optical transceiver 1012, the second fiber optical transceiver 2012 and pump light source and probe source, they can select the optical fibre wavelength division multiplexer of fused tapered, also can select the optical fibre wavelength division multiplexer of filter plate type.1 * 3 optical fibre wavelength division multiplexer of the preferred filter plate type of the present embodiment, it can realize the separation of (1310 ± 20) nm, (1490 ± 20) nm and (1550 ± 0.5) nm wave band of laser and multiplexing; It is the coupling mechanism of 10:90 that the first fiber coupler 1031 and the second fiber coupler 1034 all adopt splitting ratio, and it is the coupling mechanism of 50:50 that the 3rd fiber coupler adopts splitting ratio, is ripe existing device; Pulse-modulator 1032, optical circulator 1033, frequency detector 1036 and photoelectric switching circuit 1037, image intensifer 1038 all adopt prior art.
In the present embodiment, main equipment controller 104 and all adopt existing controller from device controller 204 can adopt the high-performance 16 bit digital controllers (dsPIC33F) of the U.S. little core company to be the control circuit on basis in specific implementation process.Main equipment controller 104 is mainly used in controlling output wavelength and the Output optical power of probe source 102, control the duty of the first fiber optical transceiver 1012, and demodulate the brillouin frequency spectrum information of optical fiber each point according to the signal of frequency measurement and signal output module 103, and then obtain optical fiber distributed temperature, strain information.Wherein control probe source 102 output wavelengths part and can utilize existing PID(proportional-integral-differential) controller, can be according to the wavelength of frequency detector 1036 output level values adjustment probe source 102; Control probe source 102 Output optical power usable criterion laser control circuits are adjusted Output optical power by regulating the light source drive current.Be mainly used in controlling the duty of pump light source 202 from device controller 204, control scrambler 203, control the duty of the second fiber optical transceiver 2012.But wherein control the control circuit that pump light source 202 can be utilized existing accurate adjustment drive current and working temperature, control scrambler 203 mainly is to optimize to disturb the offset frequency rate for the polarization noise of eliminating backscatter signals and eliminate the polarization correlated of frequency sonding.
The principle of work of the long-distance optical fiber Brillouin light time domain analyzer of the present embodiment is: the Laser emission end that main equipment controller 104 is controlled the first fiber optical transceiver 1012 by the control end of the first fiber optical transceiver 1012 sends the laser by the 1310nm of certain rule encoding, laser enters sensor fibre 3 after the first optical fiber communication multiplexer 1011 is multiplexing, then behind the second optical fiber communication multiplexer 2011 demultiplexings, enter the signal receiving end of the second fiber optical transceiver 2012, the reception signal enters from device controller 204 by the control end of the second fiber optical transceiver 2012, resolves the command parameter of autonomous device controller 104 generations from device controller 204.Similarly, send laser by the 1490nm of certain rule encoding from the Laser emission end of device controller 204 by the second fiber optical transceiver 2012, laser enters sensor fibre 3 after the second optical fiber communication multiplexer 2011 is multiplexing, then behind the first optical fiber communication multiplexer 1011 demultiplexings, enter the signal receiving end of the first fiber optical transceiver 1012, main equipment controller 104 resolves the status information that occurs since device controller 104.So, the first remote communication module 101 and the second remote communication module 201 realize communication interaction.Main equipment 1 control from equipment 2 pump light source 202 and the original state of scrambler 203.Form pulse laser after continuous laser pulse modulated device 1032 modulation that probe source 102 sends, pulse laser enters sensor fibre 3 behind optical circulator 1033 and the first light wavelength division multiplexing 1011; The signal that the continuous laser that pump light source 202 is sent and the second fiber optical transceiver 2012 send, recycles afterwards the first light wavelength division multiplexing 1011 and separates wavelength-division multiplex through sensor fibre 3 transmission through the second light wavelength division multiplexing 2011 wavelength-division multiplex.Wherein the continuous pump light that sends of pump light source 202 after image intensifer 1038 amplifies or directly and the detection light that sends of probe source 102 at the 3rd fiber coupler 1035 beat frequencies, after surveying beat frequency rate, frequency detector 1036 adjusts the probe source frequency by main equipment controller 104, to realize the scanning of sensor fibre Brillouin frequency spectrum.Pump light and enter photoelectric switching circuit 1037 through optical fiber circulator 1033 from the backscatter signals light of sensor fibre 3, and then entering main equipment controller 104, main equipment controller 104 obtains sensor fibre 3 Brillouin shift and temperature, stress information everywhere by analytical calculation.
The present embodiment utilizes wavelength-division multiplex technique that optical fiber Brillouin sensing part and optical communication fractional reuse are arrived same sensor fibre, utilize simultaneously frequency measurement and signal output module 103 survey frequencies that contain Optical Amplifier Unit, under the prerequisite of not sacrificing Brillouin sensing segment space resolution, measuring accuracy and Measuring Time, the measuring distance of optical fiber Brillouin light time domain analyzer has been increased by 1 times, not only saved fiber resource, improved fiber utilization, and simple in structure, cost is low.
Embodiment two:
A kind of long-distance optical fiber Brillouin light time domain analyzer that the present embodiment proposes, such as Fig. 1, Fig. 3, Fig. 4 and shown in Figure 5, the difference of the optical fiber Brillouin light time domain analyzer of the optical fiber Brillouin light time domain analyzer of the present embodiment and embodiment one is: increased a telecommunication optical fiber 4; The output terminal of frequency measurement and signal output module 103 is not to be connected with an end of sensor fibre 3 by the first remote communication module 101, but directly is connected with an end of sensor fibre 3, and the first remote communication module 101 is connected with telecommunication optical fiber 4; Similarly, the output terminal of scrambler 203 is not to be connected with the other end of sensor fibre 3 by the second remote communication module 201, but directly is connected with the other end of sensor fibre 3, and the second remote communication module 201 is connected with telecommunication optical fiber 4.
The long-distance optical fiber Brillouin light time domain analyzer of the present embodiment as shown in Figure 3, it also comprises telecommunication optical fibers 4 that walk abreast and arrange with sensor fibre 3, main equipment 1 and mutual with wired mode (namely by telecommunication optical fiber 4) telecommunication by the first remote communication module 101 and the second remote communication module 201 from equipment 2, the first remote communication module 101 comprises the first light wavelength division multiplexing 1011 and the first fiber optical transceiver 1012, the second remote communication module 201 comprises the second light wavelength division multiplexing 2011 and the second fiber optical transceiver 2012, the first light wavelength division multiplexing 1011 and the second light wavelength division multiplexing 2011 all have two input ends and an output terminal, the first fiber optical transceiver 1012 and the second fiber optical transceiver 2012 all have a control end and a Laser emission end and a signal receiving end, two input ends of the first light wavelength division multiplexing 1011 and Laser emission end and the signal receiving end of the first fiber optical transceiver 1012 connect one to one, the output terminal of the first light wavelength division multiplexing 1011 is connected with an end of telecommunication optical fiber 4, the control end of the first fiber optical transceiver 1012 is connected with main equipment controller 104, two input ends of the second light wavelength division multiplexing 2011 and Laser emission end and the signal receiving end of the second fiber optical transceiver 2012 connect one to one, the output terminal of the second light wavelength division multiplexing 2011 is connected with the other end of telecommunication optical fiber 4, the control end of the second fiber optical transceiver 2012 be connected from device controller 204.At this, the first fiber optical transceiver 1012 and the second fiber optical transceiver 2012 have all adopted the fiber optical transceiver with a control end, a Laser emission end and a signal receiving end, and the Laser emission end of the first fiber optical transceiver 1012 is not identical with the wavelength of the Laser emission end of the second fiber optical transceiver 2012; The first fiber optical transceiver 1012 and the second fiber optical transceiver 2012 also can all adopt has the fiber optical transceiver that a control end and Laser emission and signal receive common terminal, be that Laser emission end and signal receiving end are merged into a common terminal, in addition two input ends of the first light wavelength division multiplexing 1011 all are connected with signal reception common terminal with the Laser emission of the first fiber optical transceiver 1012 during connection, and in addition two input ends of the second light wavelength division multiplexing 2011 receive common terminal with the Laser emission of the second fiber optical transceiver 2012 with signal and are connected.
In the present embodiment, the optical maser wavelength of the first light wavelength division multiplexing 1011 and the second light wavelength division multiplexing 2011 separable, multiplexing the first fiber optical transceivers 1012 and the optical maser wavelength of the second fiber optical transceiver 2012, they can select the optical fibre wavelength division multiplexer of fused tapered, also can select the optical fibre wavelength division multiplexer of filter plate type.The present embodiment preferred molten is drawn 1 * 2 tapered optical fibre wavelength division multiplexer, and it can realize separating with multiplexing of (1310 ± 20) nm and (1490 ± 20) nm wave band of laser.Other device and the embodiment one of the present embodiment are similar.
Principle of work and the embodiment one of the long-distance optical fiber Brillouin light time domain analyzer of the present embodiment are similar.In the present embodiment, the first remote communication module 101 and the second remote communication module 201 are directly by independent telecommunication optical fiber 4 realization main equipments 101 with from the communication interaction between the equipment 201, since the two ends of sensor fibre 3 not with the first light wavelength division multiplexing 1011 be connected light wavelength division multiplexing 2011 and be connected, therefore reduced the optical fiber link loss, improve the backscatter signals of sensor fibre 3 tail ends, thereby further improved the measuring accuracy of optical fiber Brillouin light time domain analyzer.
Embodiment three:
A kind of long-distance optical fiber Brillouin light time domain analyzer that the present embodiment proposes, such as Fig. 1 and shown in Figure 6, the optical fiber Brillouin light time domain analyzer of the present embodiment is with the difference of the optical fiber Brillouin light time domain analyzer of embodiment two: the frequency measurement that the structure (as shown in Figure 6) of the measurement of the present embodiment medium frequency and signal output module and embodiment one and embodiment two provide and the structure (as shown in Figure 4 and Figure 5) of signal output module are not identical, and be not identical with the connected mode of other module or other optical device yet; And from equipment 2, increasing the 4th fiber coupler 205, on the first light wavelength division multiplexing 1011 and the second light wavelength division multiplexing 2011, also be provided with the 3rd input end simultaneously.
The long-distance optical fiber Brillouin light time domain analyzer of the present embodiment as shown in Figure 6, it also is provided with the 3rd input end on the first light wavelength division multiplexing 1011 and the second light wavelength division multiplexing 2011, between the other end of the scrambler 203 from equipment 2 and sensor fibre 3, be provided with the 4th fiber coupler 205, the 4th fiber coupler 205 has an input end and two output terminals, the output terminal of scrambler 203 is connected with the input end of the 4th fiber coupler 205, an output terminal of the 4th fiber coupler 205 is connected with the other end of sensor fibre 3, another output terminal of the 4th fiber coupler 205 is connected with the 3rd input end of the second light wavelength division multiplexing 2011, frequency measurement and signal output module 103 comprise the first fiber coupler 1031, pulse-modulator 1032, optical circulator 1033, the 3rd fiber coupler 1035, frequency detector 1036 and photoelectric switching circuit 1037, the first fiber coupler 1031 has an input end and two output terminals, the 3rd fiber coupler 1035 has two input ends and an output terminal, optical circulator 1033 has three ports, the input end of the first fiber coupler 1031 is connected with the output terminal of probe source 102, an output terminal of the first fiber coupler 1031 is connected with the input end of pulse-modulator 1032, another output terminal of the first fiber coupler 1031 is connected with an input end of the 3rd fiber coupler 1035, the output terminal of pulse-modulator 1032 is connected with first port of optical circulator 1033, second port of optical circulator 1033 is connected with an end of sensor fibre 3, the 3rd port of optical circulator 1033 is connected with the input end of photoelectric switching circuit 1037, another input end of the 3rd fiber coupler 1035 is connected with the 3rd input end of the first light wavelength division multiplexing 1011, the output terminal of the 3rd fiber coupler 1035 is connected with the input end of frequency detector 1036, and the output terminal that the output terminal of frequency detector 1036 is connected with photoelectric switching circuit is connected with main equipment controller 104 respectively.
In the present embodiment, probe source 102 is selected the low noise narrow linewidth semiconductor laser, and centre wavelength is 1550.12nm, and power is 10mW; Pump light source 202 is selected the low noise narrow cable and wide optical fiber laser, and centre wavelength is 1550.20nm, and power is greater than 100mW; It is the fiber coupler of 1:99 that the 4th fiber coupler 205 adopts splitting ratio, wherein 1% pump light enters sensor fibre 3,99% pump light enters telecommunication optical fiber 4, at this moment, decay through 100km telecommunication optical fiber 4, the power of pump light that enters another input end of the 3rd fiber coupler 1035 still has about 1mW, thereby has guaranteed the measurement accuracy of frequency detector 1036.Other device of the present embodiment and embodiment one and embodiment two are similar.
The principle of work of the long-distance optical fiber Brillouin light time domain analyzer of the present embodiment and embodiment one, embodiment two are similar.Because optical fiber Brillouin sensing partly requires the power of pump light source can not be too large; The frequency sonding part then requires the power of pump light source higher, therefore can be so that the continuous light that the pump light source 202 from equipment 2 is sent enters telecommunication optical fiber 4 after 205 light splitting of the 4th fiber coupler, be optical fiber of frequency measurement and optical fiber telecommunications fractional reuse, the optical fiber Brillouin sensing part takies separately an optical fiber, so both can improve the backscatter signals of sensor fibre 3 tail ends, thereby improve the measuring accuracy of optical fiber Brillouin light time domain analyzer, can improve again the accuracy of frequency measurement.
Embodiment four:
A kind of long-distance optical fiber Brillouin light time domain analyzer that the present embodiment proposes, such as Fig. 1 and shown in Figure 7, the difference of the optical fiber Brillouin light time domain analyzer of the optical fiber Brillouin light time domain analyzer of the present embodiment and embodiment three is: increased an image intensifer 1038 between another input end of the 3rd input end of the first light wavelength division multiplexing 1011 and the 3rd fiber coupler 1035, and probe source 102 and pump light source 202 are all selected the low noise narrow linewidth semiconductor laser, and the splitting ratio of the 4th fiber coupler 205 is 10:90.
In the present embodiment, the 3rd input end of the first light wavelength division multiplexing 1011 is connected with the input end of image intensifer 1038, the output terminal of image intensifer 1038 is connected with another input end of the 3rd fiber coupler 1035, and image intensifer 1038 is selected EDFA amplifier or the SOA amplifier of the upper common employing of communication; Probe source 102 is selected the low noise narrow linewidth semiconductor laser, and centre wavelength is 1550.12nm, and power is 10mW; Pump light source 202 is selected the low noise narrow linewidth semiconductor laser, and centre wavelength is 1550.20nm, and power is 10mW.Other device of the present embodiment and connected mode and embodiment three are similar.Because another input end at the 3rd fiber coupler 1035 has increased image intensifer 1038, therefore lower to the demanded power output of pump light source 202, can select so the better narrow linewidth semiconductor laser of modulating performance.
Embodiment five:
A kind of long-distance optical fiber Brillouin light time domain analyzer that the present embodiment proposes is such as Fig. 1, Fig. 4 and shown in Figure 5.The difference of the optical fiber Brillouin light time domain analyzer of the optical fiber Brillouin light time domain analyzer of the present embodiment and above-mentioned four embodiment is: the first remote communication module 101 and the second remote communication module 201 adopt communication to communicate alternately, and the first remote communication module 101 can be wireless communication module independently, also can be for being embedded at the wireless communication module in the main equipment controller 104, the second remote communication module 201 can be wireless communication module independently, also can be for being embedded at the wireless communication module from device controller 204.
In the present embodiment, the first remote communication module 101 and the second remote communication module 201 are all optional with technical grade GPRS wireless communication module.
In the present embodiment, the first remote communication module 101 and the second remote communication module 201 directly adopt wireless communication module, can be so that the structure of optical fiber Brillouin light time domain analyzer of the present invention be more succinct, and need not to take fiber resource, be adapted at cordless communication network and cover the good interior monitoring in zone.
The above is preferred embodiment of the present invention only, should not be construed as limiting the scope of the invention.Within the spirit and principles in the present invention all, any type of distortion of doing, be equal to replacement, improvement etc. and all should be included within protection scope of the present invention.
Claims (10)
1. long-distance optical fiber Brillouin light time domain analyzer, it is characterized in that comprising sensor fibre, mainly by probe source, frequency measurement and signal output module, the main equipment controller, the main equipment that the first remote communication module forms and mainly by pump light source, scrambler, from device controller, the second remote communication module form from equipment, the output terminal of described probe source is connected with the input end of described frequency measurement and signal output module, the output terminal of described frequency measurement and signal output module is connected with an end of described sensor fibre, described main equipment controller respectively with described probe source, described frequency measurement and signal output module, described the first remote communication module is connected, the output terminal of described pump light source is connected with the input end of described scrambler, the output terminal of described scrambler is connected with the other end of described sensor fibre, described from device controller respectively with described pump light source, described scrambler, described the second remote communication module is connected, described the first remote communication module and described the second remote communication module communication interaction; Described frequency measurement and signal output module are used for the backscatter signals that continuous light to described probe source and the output of described pump light source carries out frequency measurement and the continuous light of described probe source output is modulated into pulsed light and receives described sensor fibre.
2. a kind of long-distance optical fiber Brillouin light time domain analyzer according to claim 1, it is characterized in that described the first remote communication module is for wireless communication module independently or for being embedded at the wireless communication module in the described main equipment controller, described the second remote communication module is for wireless communication module independently or for being embedded at described wireless communication module from device controller, described main equipment and described mutual with the wireless mode telecommunication by described the first remote communication module and described the second remote communication module from equipment.
3. a kind of long-distance optical fiber Brillouin light time domain analyzer according to claim 1, it is characterized in that described the first remote communication module and described the second remote communication module are the optical fiber telecommunications module, described main equipment and described mutual with the wired mode telecommunication by described the first remote communication module and described the second remote communication module from equipment, described the first remote communication module comprises the first light wavelength division multiplexing and the first fiber optical transceiver, described the second remote communication module comprises the second light wavelength division multiplexing and the second fiber optical transceiver, described the first light wavelength division multiplexing and described the second light wavelength division multiplexing all have three input ends and an output terminal, described the first fiber optical transceiver and described the second fiber optical transceiver all have a control end and a Laser emission end and a signal receiving end, or all have a control end and Laser emission and signal and receive common terminal, an input end of described the first light wavelength division multiplexing is connected with the output terminal of described frequency measurement and signal output module, in addition two input ends of described the first light wavelength division multiplexing and the Laser emission end connection corresponding to signal receiving end of described the first fiber optical transceiver, or all be connected with signal reception common terminal with the Laser emission of described the first fiber optical transceiver, the output terminal of described the first light wavelength division multiplexing is connected with an end of described sensor fibre, the control end of described the first fiber optical transceiver is connected with described main equipment controller, an input end of described the second light wavelength division multiplexing is connected with the output terminal of described scrambler, in addition two input ends of described the second light wavelength division multiplexing and the Laser emission end connection corresponding to signal receiving end of described the second fiber optical transceiver, or all be connected with signal reception common terminal with the Laser emission of described the second fiber optical transceiver, the output terminal of described the second light wavelength division multiplexing is connected with the other end of described sensor fibre, and the control end of described the second fiber optical transceiver is connected from device controller with described.
4. a kind of long-distance optical fiber Brillouin light time domain analyzer according to claim 1, characterized by further comprising a telecommunication optical fiber that walks abreast and arrange with described sensor fibre, described the first remote communication module and described the second remote communication module are the optical fiber telecommunications module, described main equipment and described mutual with the wired mode telecommunication by described the first remote communication module and described the second remote communication module from equipment, described the first remote communication module comprises the first light wavelength division multiplexing and the first fiber optical transceiver, described the second remote communication module comprises the second light wavelength division multiplexing and the second fiber optical transceiver, described the first light wavelength division multiplexing and described the second light wavelength division multiplexing all have two input ends and an output terminal, described the first fiber optical transceiver and described the second fiber optical transceiver all have a control end and a Laser emission end and a signal receiving end, or all have a control end and Laser emission and signal and receive common terminal, two input ends of described the first light wavelength division multiplexing and the Laser emission end connection corresponding to signal receiving end of described the first fiber optical transceiver, or all be connected with signal reception common terminal with the Laser emission of described the first fiber optical transceiver, the output terminal of described the first light wavelength division multiplexing is connected with an end of described telecommunication optical fiber, the control end of described the first fiber optical transceiver is connected with described main equipment controller, two input ends of described the second light wavelength division multiplexing and the Laser emission end connection corresponding to signal receiving end of described the second fiber optical transceiver, or all be connected with signal reception common terminal with the Laser emission of described the second fiber optical transceiver, the output terminal of described the second light wavelength division multiplexing is connected with the other end of described telecommunication optical fiber, and the control end of described the second fiber optical transceiver is connected from device controller with described.
5. according to claim 3 or 4 described a kind of long-distance optical fiber Brillouin light time domain analyzers, it is characterized in that the wavelength of Laser emission end of the Laser emission end of described the first fiber optical transceiver and described the second fiber optical transceiver is not identical.
6. each described a kind of long-distance optical fiber Brillouin light time domain analyzer in 4 according to claim 1, it is characterized in that described frequency measurement and signal output module comprise the first fiber coupler, pulse-modulator, optical circulator, the second fiber coupler, the 3rd fiber coupler, frequency detector and photoelectric switching circuit, described the first fiber coupler has an input end and two output terminals, described the second fiber coupler and described the 3rd fiber coupler all have two input ends and an output terminal, described optical circulator has three ports, the input end of described the first fiber coupler is connected with the output terminal of described probe source, an output terminal of described the first fiber coupler is connected with the input end of described pulse-modulator, another output terminal of described the first fiber coupler is connected with an input end of described the 3rd fiber coupler, the output terminal of described pulse-modulator is connected with first port of described optical circulator, second port of described optical circulator is connected with an input end of described the second fiber coupler, the 3rd port of described optical circulator is connected with the input end of described photoelectric switching circuit, another input end of described the second fiber coupler is connected with another input end of described the 3rd fiber coupler, the output terminal of described the second fiber coupler directly or indirectly is connected with an end of described sensor fibre, the output terminal of described the 3rd fiber coupler is connected with the input end of described frequency detector, the output terminal of described frequency detector be connected the output terminal of photoelectric switching circuit and be connected with described main equipment controller respectively.
7. a kind of long-distance optical fiber Brillouin light time domain analyzer according to claim 6, it is characterized in that being provided with image intensifer between described the second fiber coupler and described the 3rd fiber coupler, another input end of described the second fiber coupler is connected with the input end of described image intensifer, and the output terminal of described image intensifer is connected with another input end of described the 3rd fiber coupler.
8. a kind of long-distance optical fiber Brillouin light time domain analyzer according to claim 4, it is characterized in that described the first light wavelength division multiplexing and described the second light wavelength division multiplexing also are provided with the 3rd input end, be provided with the 4th fiber coupler between the other end of described scrambler and described sensor fibre, described the 4th fiber coupler has an input end and two output terminals, the output terminal of described scrambler is connected with the input end of described the 4th fiber coupler, an output terminal of described the 4th fiber coupler is connected with the other end of described sensor fibre, another output terminal of described the 4th fiber coupler is connected with the 3rd input end of described the second light wavelength division multiplexing, described frequency measurement and signal output module comprise the first fiber coupler, pulse-modulator, optical circulator, the 3rd fiber coupler, frequency detector and photoelectric switching circuit, described the first fiber coupler has an input end and two output terminals, described the 3rd fiber coupler has two input ends and an output terminal, described optical circulator has three ports, the input end of described the first fiber coupler is connected with the output terminal of described probe source, an output terminal of described the first fiber coupler is connected with the input end of described pulse-modulator, another output terminal of described the first fiber coupler is connected with an input end of described the 3rd fiber coupler, the output terminal of described pulse-modulator is connected with first port of described optical circulator, second port of described optical circulator is connected with an end of described sensor fibre, the 3rd port of described optical circulator is connected with the input end of described photoelectric switching circuit, another input end of described the 3rd fiber coupler is connected with the 3rd input end of described the first light wavelength division multiplexing, the output terminal of described the 3rd fiber coupler is connected with the input end of described frequency detector, the output terminal of described frequency detector be connected the output terminal of photoelectric switching circuit and be connected with described main equipment controller respectively.
9. a kind of long-distance optical fiber Brillouin light time domain analyzer according to claim 8, it is characterized in that being provided with image intensifer between described the 3rd fiber coupler and described the first light wavelength division multiplexing, the 3rd input end of described the first light wavelength division multiplexing is connected with the input end of described image intensifer, and the output terminal of described image intensifer is connected with another input end of described the 3rd fiber coupler.
10. a kind of long-distance optical fiber Brillouin light time domain analyzer according to claim 1 is characterized in that in described probe source and the described pump light source is frequency adjustable narrow linewidth laser and another narrow linewidth laser of fixing for frequency.
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