CN102322879A - Continuous optical wavelength division multiplexing long-distance distributed disturbance positioning device and method - Google Patents
Continuous optical wavelength division multiplexing long-distance distributed disturbance positioning device and method Download PDFInfo
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Abstract
The invention discloses a continuous optical wavelength division multiplexing long-distance distributed disturbance positioning device and a method. Optical fibers are used for realizing long-distance distributed disturbance sensing and positioning. Two broadband light sources respectively emit light with center wavelength being lambda 1 and lambda 2, the light is fed into the optical fibers through wavelength division multiplexers, two independent interference light paths are respectively formed and interference light signals of the interference light paths are respectively received by two sets of independent photoelectric detection circuits. For the interference light signals with center wavelength being lambda 2, under the effects of a tail-end wavelength division multiplexer and refractive index matching fluid, light signal reflection does not exist. Therefore, the interference light signals are backscattered signals in sensor optical fibers and contain disturbance points, disturbance characteristics and position information of the disturbance points. For the interference light signals with center wavelength being lambda 1, under the effects of an optical fiber tail-end wavelength division multiplexer and a reflecting mirror, the signals only contain the disturbance characteristic information of the disturbance points. By dividing the light signals of one interference light path by the light signals of the other interference light path, the position information of the disturbance points can be obtained.
Description
Technical field
The present invention's design belongs to Fibre Optical Sensor and protection and monitor field.Relate in particular to the engineering and the equipment of long-distance distributed safety monitoring.Can the vibration of monitored area be detected and locate.
Background technology
For resident residential quarter and facility's objectives with great value, such as dam, oil, natural gas line, warehouse, museum even national boundary etc., increasing to the demand of security protection.These have the facility and the target of great value, in case by undesirable's seepage failure, will cause great destruction to the people's lives and property safety and even nation's security, therefore are badly in need of carrying out effective safeguard protection.
At present, using for safety monitoring system is infrared correlation scheme more widely.Though this scheme is simple, cheap, be easy to found by the invador, make the invador can be relatively easy to avoid the control point.Therefore this scheme is difficult to the invador is effectively monitored.In addition; Also have the defence system based on " vibration wireline " or " leaky cable ", though these two kinds of schemes can solve the problem of infrared correlation scheme to a certain extent, the total system cost is higher relatively; And electronic system also is subject to extraneous interference, causes " false declaration ".
To the problems referred to above, the safety monitoring system based on optical fiber has been proposed at present.By common telecommunication optical fiber as sensor.When the external world was applied to physical quantity such as stress on the optical fiber etc. and changes, corresponding variation will take place in each parameter of the light through optical fiber such as phase place, amplitude, frequency etc.Can find out extraneous situation through monitoring these variable quantities.At present, the safety monitoring system based on optical fiber has mainly adopted based on OTDR technology and two kinds of schemes of interference technique.What at present the OTDR technology had developed is comparatively ripe, adopt the technical scheme of OTDR to be easy to realize, but this scheme sensitivity is lower, can't detect small vibration, and along with the increase of monitoring distance, its monitoring and bearing accuracy will decrease.
To the existing problem of OTDR, companies more both domestic and external and research institution have proposed a series of scheme.Optical fiber supervisory system like the proposition of Australian FFT (Future Fiber Technologies) company based on the Mach-Zehnder interferometer.But, not only increased the cost of system, and improved the difficulty of system constructing greatly owing to need when practice of construction, bury three optical fiber simultaneously underground.
Summary of the invention
To the existing problem of present security protection system, the present invention proposes long-distance distributed disturbance locating device of a kind of continuous light wavelength-division multiplex type and method.This scheme has very high sensitivity, and accurate localization is carried out in the oscillation point to external world.
Technical scheme:
The long-distance distributed disturbance locating device of a kind of continuous light wavelength-division multiplex type; Comprise the centre wavelength of luminous ripple different, first wavelength division multiplexer, second wavelength division multiplexer, the 3rd wavelength division multiplexer, first fiber coupler, second fiber coupler, fibre delay line, catoptron, index-matching fluid and sensor fibre; The bidirectional port of first wideband light source and second wideband light source links to each other with first bi-directional light port of first wavelength division multiplexer and the second bi-directional light port of first wavelength division multiplexer respectively; The 3rd bi-directional light port of first wavelength division multiplexer links to each other with the first bi-directional light port of first fiber coupler; The 3rd bi-directional light port of first fiber coupler links to each other with the bi-directional light port of fibre delay line; The 4th bi-directional light port of first fiber coupler links to each other with second bi-directional light port of second fiber coupler and the first bi-directional light port of the 3rd wavelength division multiplexer respectively with the second bi-directional light port; First bi-directional light port of second fiber coupler and the 3rd bi-directional light port of second fiber coupler link to each other with another bi-directional light port of fibre delay line and the bi-directional light port of sensor fibre respectively; The first bi-directional light port of second wavelength division multiplexer links to each other with catoptron; The second bi-directional light port of second wavelength division multiplexer links to each other with index-matching fluid; The 3rd bi-directional light port of second wavelength division multiplexer links to each other with another bi-directional light port of sensor fibre; The second bi-directional light port of the 3rd wavelength division multiplexer links to each other with first photoelectric detective circuit; The 3rd bi-directional light port of the 3rd wavelength division multiplexer links to each other with second photoelectric detective circuit.
The long-distance distributed disturbance localization method of a kind of continuous light wavelength-division multiplex type, the centre wavelength that first wideband light source is sent is λ
1The wavelength that sends of light and second wideband light source be λ
2Light respectively in the second bi-directional light port of the first bi-directional light port through sending into first wavelength division multiplexer and first wavelength division multiplexer; Containing wavelength optical signals exports from the 3rd bi-directional light port of first wavelength division multiplexer; And send in first fiber coupler through the first bi-directional light port of first fiber coupler; Light is divided into two in first fiber coupler; Part light is sent into bi-directional light port of fibre delay line through the 3rd bi-directional light port of first fiber coupler and is sent in second fiber coupler through another bi-directional light port of fibre delay line and the first bi-directional light port of second fiber coupler; Another part light is sent in second fiber coupler through the 4th bi-directional light port of first fiber coupler and the second bi-directional light port of second fiber coupler; Send into the light of second fiber coupler and from its 3rd bi-directional light port, export, and send in second wavelength division multiplexer through the 3rd bi-directional light port of the sensor fibre and second wavelength division multiplexer, the light signal of two kinds of wavelength separates by wavelength in second wavelength division multiplexer; Wherein, centre wavelength is λ
1Light send in the catoptron through the first bi-directional light port of second wavelength division multiplexer, centre wavelength is λ
2Light send in the index-matching fluid and be absorbed through the second bi-directional light port of second wavelength division multiplexer; Wavelength by mirror reflects is λ
1Reflected light signal send in second wavelength division multiplexer through the first bi-directional light port of second wavelength division multiplexer, and send in the sensor fibre through the 3rd bi-directional light port of second wavelength division multiplexer, be λ by wavelength
2Back-scattering light and wavelength be λ
1The sensor fibre formed of reflected light in light signal send in second fiber coupler and in second fiber coupler through the 3rd bi-directional light port of second fiber coupler and be divided into two once more; And export through the first bi-directional light port and the second bi-directional light port of second fiber coupler respectively; Light from the first bi-directional light port of second fiber coupler is sent into first fiber coupler through fibre delay line; Light from the second bi-directional light port of second fiber coupler is sent into first fiber coupler; The light of sending into first fiber coupler through fibre delay line through light interferes in first fiber coupler with light from the second bi-directional light port of second fiber coupler, and to export the 3rd wavelength division multiplexer to and isolated centre wavelength by the 3rd wavelength division multiplexer through the second bi-directional light port of first fiber coupler be λ
1Light and centre wavelength be λ
2Light, centre wavelength is λ
1Light and centre wavelength be λ
2Light send into first photoelectric detective circuit and second photoelectric detective circuit through the second bi-directional light port and the 3rd bi-directional light port of the 3rd wavelength division multiplexer respectively; Detected voltage signal of first photoelectric detective circuit and the detected voltage signal of second photoelectric detective circuit are divided by, obtain the positional information of disturbance point.
Distribution type fiber-optic security protection light path system based on principle of interference of the present invention is that the light that wideband light source sends is sent in the interferometer, and sends into sensor fibre through interferometer.This light reflects at the sensor fibre tail end, forms interference signal through in the interferometer once more, and finally by corresponding photoelectric detective circuit identification.When disturbance takes place in the external world, such as the individual swarm into, construction and disaster etc. on every side, then corresponding the variation will take place in interference signal, thus realization is to the security protection of emphasis facility.
In above-mentioned security protection, this programme has also been realized the accurate location of disturbance point to external world.The light of two different wave lengths is sent in the same optical fiber through wavelength division multiplexer.The light of one of them wavelength at the sensor fibre tail end because the effect reflected back interferometer of catoptron and form interference signal.This interference signal has comprised the information of disturbing signal in the sensor fibre.And the light of another wavelength does not reflect owing to the effect of index-matching fluid.Have only along having formed interference signal in the back-scattering light reflected back interferometer of sensor fibre.This interference signal has not only comprised the disturbance information on the sensor fibre, has also comprised the positional information of disturbance point.Above-mentioned two interference signals are asked for envelope, be divided by again.Can obtain the positional information of disturbance point.
Beneficial effect: compared with prior art, the present invention has following advantage:
Adopted based on the principle of interfering and realized the detection to invasion, highly sensitive, when the approaching protection of outside invading person optical fiber, this system can detect the existence of invasion accurately.
Adopted the two optical interference circuit designs of two light sources, realized location invasion.
Light source, light path and Photoelectric Detection equipment have been simplified system's mounting hardness at the same end of system.
Adopted an optical fiber to be used for sensing, reduced system cost and sensing optic cable lay difficulty.
Description of drawings
Fig. 1 is a The general frame of the present invention.Wherein have: wideband light source 1, wideband light source 2, the first wavelength division multiplexers 3; First fiber coupler 4, fibre delay line 5, the second fiber couplers 6; Sensor fibre 7, the second wavelength division multiplexers 8, catoptron 9; Index-matching fluid 10, the first wavelength division multiplexers 11 first photoelectric detective circuits 12, the second photoelectric detective circuits 13.
Embodiment
Embodiment 1
The long-distance distributed disturbance locating device of a kind of continuous light wavelength-division multiplex type; Comprise different first wideband light source 1 of the centre wavelength of luminous ripple and second wideband light source, 2, the first wavelength division multiplexers 3, second wavelength division multiplexer 8, the 3rd wavelength division multiplexer 11, first fiber coupler 4, second fiber coupler 6, fibre delay line 5, catoptron 9, index-matching fluid 10 and sensor fibre 7; The bi-directional light port of first wideband light source 1 and second wideband light source 2 links to each other with first bi-directional light port 3a of first wavelength division multiplexer 3 and the second bi-directional light port 3b of first wavelength division multiplexer 3 respectively; The 3rd bi-directional light port 3c of first wavelength division multiplexer 3 links to each other with the first bi-directional light port 4a of first fiber coupler 4; The 3rd bi-directional light port 4c of first fiber coupler 4 links to each other with the bi-directional light port of fibre delay line 5; The 4th bi-directional light port 4d of first fiber coupler 4 links to each other with second bi-directional light port 6b of second fiber coupler 6 and the first bi-directional light port one 1a of the 3rd wavelength division multiplexer 11 respectively with the second bi-directional light port 4b; First bi-directional light port 6a of second fiber coupler 6 and the 3rd bi-directional light port 6c of second fiber coupler 6 link to each other with another bi-directional light port of fibre delay line 5 and the bi-directional light port of sensor fibre 7 respectively; The first bi-directional light port 8a of second wavelength division multiplexer 8 links to each other with catoptron 9; The second bi-directional light port 8b of second wavelength division multiplexer 8 links to each other with index-matching fluid 10; The 3rd bi-directional light port 8c of second wavelength division multiplexer 8 links to each other with another bi-directional light port of sensor fibre 7; The second bi-directional light port one 1b of the 3rd wavelength division multiplexer 11 links to each other with first photoelectric detective circuit 12; The 3rd bi-directional light port one 1c of the 3rd wavelength division multiplexer 11 links to each other with second photoelectric detective circuit 13.
Embodiment 2
The long-distance distributed disturbance localization method of a kind of continuous light wavelength-division multiplex type, the centre wavelength that first wideband light source 1 is sent is λ
1The wavelength that sends of light and second wideband light source 2 be λ
2Light respectively among the second bi-directional light port 3b of the first bi-directional light port 3a through sending into first wavelength division multiplexer 3 and first wavelength division multiplexer 3; Containing wavelength optical signals exports from the 3rd bi-directional light port 3c of first wavelength division multiplexer 3; And send in first fiber coupler 4 through the first bi-directional light port 4a of first fiber coupler 4; Light is divided into two in first fiber coupler 4; The three bi-directional light port 4c of part light through first fiber coupler 4 sends into bi-directional light port of fibre delay line 5 and sends in second fiber coupler 6 through another bi-directional light port of fibre delay line 5 and the first bi-directional light port 6a of second fiber coupler 6; Another part light is sent in second fiber coupler 6 through the 4th bi-directional light port 4d of first fiber coupler 4 and the second bi-directional light port 6b of second fiber coupler 6; Send into the light of second fiber coupler 6 and from its 3rd bi-directional light port 6c, export, and send in second wavelength division multiplexer 8 through the 3rd bi-directional light port 8c of the sensor fibre 7 and second wavelength division multiplexer 8, the light signal of two kinds of wavelength separates by wavelength in second wavelength division multiplexer 8; Wherein, centre wavelength is λ
1Light send in the catoptron 9 through the first bi-directional light port 8a of second wavelength division multiplexer 8, centre wavelength is λ
2Light send in the index-matching fluid 10 and be absorbed through the second bi-directional light port 8b of second wavelength division multiplexer 8; Wavelength by catoptron 9 reflections is λ
1Reflected light signal send in second wavelength division multiplexer 8 through the first bi-directional light port 8a of second wavelength division multiplexer 8, and send in the sensor fibre 7 through the 3rd bi-directional light port 8c of second wavelength division multiplexer 8, be λ by wavelength
2Back-scattering light and wavelength be λ
1The sensor fibre 7 formed of reflected light in light signal send in second fiber coupler 6 and in second fiber coupler 6 through the 3rd bi-directional light port 6c of second fiber coupler 6 and be divided into two once more; And the first bi-directional light port 6a and the second bi-directional light port 6b through second fiber coupler 6 exports respectively; Light from the first bi-directional light port 6a of second fiber coupler 6 is sent into first fiber coupler 4 through fibre delay line 5; Light from the second bi-directional light port 6b of second fiber coupler 6 is sent into first fiber coupler 4; The light of sending into first fiber coupler 4 through fibre delay line 5 through light interferes in first fiber coupler 4 with light from the second bi-directional light port 6b of second fiber coupler 6, and to export the 3rd wavelength division multiplexer 11 to and isolated centre wavelength by the 3rd wavelength division multiplexer 11 through the second bi-directional light port 4b of first fiber coupler 4 be λ
1Light and centre wavelength be λ
2Light, centre wavelength is λ
1Light and centre wavelength be λ
2Light send into first photoelectric detective circuit 12 and second photoelectric detective circuit 13 through the second bi-directional light port one 1b and the 3rd bi-directional light port one 1c of the 3rd wavelength division multiplexer 11 respectively; First photoelectric detective circuit, 12 detected voltage signals and second photoelectric detective circuit, 13 detected voltage signals are divided by, obtain the positional information of disturbance point.
To combine accompanying drawing that the present invention is done further detailed description below.
As shown in Figure 1, second fiber coupler 6 is 1 * 2 fiber couplers.First fiber coupler 4 is 2 * 2 fiber couplers.Fibre delay line 5 all adopts the G.652 optical fiber of Corning Incorporated, and fiber lengths is 10 kilometers.Wideband light source 1 adopts the light source module DL-BZ1-CS3184A and the DL-BZ1-CS5107A of Singapore DenseLight company with wideband light source 2.Sensor fibre adopts the G.652 optical fiber of Corning Incorporated, and length is 50 kilometers.First photoelectric detective circuit 1 and second photoelectric detective circuit 2 are made up of photodiode, operational amplifier LF356 and corresponding resistance, capacity cell, and the A/D acquisition module adopts the data collecting card PCI6251 of NI company.
As shown in Figure 1, the centre wavelength that wideband light source 1 sends is λ
1The wavelength that sends of light and wideband light source 2 be λ
2Light send into respectively among the bi-directional light port 3a and 3b in first wavelength division multiplexer 3 through the optical output port of light source.Contain among the bi-directional light port 3c of wavelength optical signals from first wavelength division multiplexer 3 and export, and send among the bi-directional light port 4a of first fiber coupler 4.Light is divided into two in first fiber coupler 4, sends into bi-directional light port of fibre delay line 5 through its bi-directional light port 4c respectively and sends among the bi-directional light port 6b of second fiber coupler 6 through its bi-directional light port 4d.Sending into the light of fibre delay line 5 sends among the bi-directional light port 6a of second fiber coupler 6 through another bi-directional light port of fibre delay line.Send into the light of second fiber coupler 6 and from its bi-directional light port 6c, export, send in the sensor fibre 7, and send among the bi-directional light port 8c of second wavelength division multiplexer 8 through sensor fibre.Wavelength optical signals is separated by wavelength in second wavelength division multiplexer 8.Wherein, wavelength is λ
1Light send in the mirror 9 through the bi-directional light port 8a of second wavelength division multiplexer 8, wavelength is λ
2Light send in the index-matching fluid 10 through the bi-directional light port 8b of second wavelength division multiplexer 8.
Because the reflex of catoptron 9, wavelength is λ
1Reflected light signal send in the wavelength division multiplexer 8 by catoptron 9 bi-directional light port 8a through second wavelength division multiplexer 8.And send in the sensor fibre 7 through the bi-directional light port 8c of second wavelength-division multiplex 8.Because 10 pairs of light of index-matching fluid have absorption, wavelength is λ
2Light do not have in the reflected back sensor fibre 7, so have only the backscattering light signal in the sensor fibre 7.Optical signals wavelength in the sensor fibre 7 is λ at this moment
2Back-scattering light and wavelength be λ
1Reflected light form.This light signal is moving as among the bi-directional light port 6c of second fiber coupler 6 through another bi-directional light port of sensor fibre 7.And in second fiber coupler 6, be divided into two once more, among the bi-directional light port of sending into fibre delay line 5 through the bi-directional light port 6a and the 6b of second fiber coupler 6 respectively and the bi-directional light port 4d of first fiber coupler 4.Send into the light signal of fibre delay line 5 and send among the bi-directional light port 4c of first fiber coupler 4, and export through the bi-directional light port 4b of first fiber coupler 4 through its another bi-directional light port.Reflected light and back-scattering light interfere in first fiber coupler 4 simultaneously.The interference path of reflected light signal is:
1→3a→3c→4a→4c→5→6a→6c→7→8c→8a→9→8a→8c→7→6c→6b→4d→4b
1→3a→3c→4a→4d→6b→6c→7→8c→8a→9→8a→8c→7→6c→6a→5→4c→4b
The interference path of backscattering light signal is:
2→3b→3c→4a→4c→5→6a→6c→7→6c→6b→4d→4b
2→3b→3c→4a→4d→6b→6c→7→6c→6a→5→4c→4b
Interference signal is sent among the bi-directional light port one 1a of the 3rd wavelength division multiplexer 11 through the bi-directional light port 4b of first fiber coupler 4.And in the 3rd wavelength division multiplexer 11, separate by wavelength.Wavelength is λ
1Light send in first photoelectric detective circuit 12 through the bidirectional port 11b of the 3rd wavelength division multiplexer 11; Wavelength is λ
2Light send in second photoelectric detective circuit 13 through the bidirectional port 11c of the 3rd wavelength division multiplexer 11.
When light transmitted in optical fiber, luminous power can be expressed as with the variation of propagation distance:
P(z)＝P
0□exp(-αz)
Wherein, P
0It is the launched power of light source; α is the attenuation coefficient of optical fiber to light signal.Be that the interchange optical power signals of the bi-directional light port one 1b of the 3rd wavelength division multiplexer 11 can be expressed as as perturbation action in sensor fibre 7:
P
1＝P
0□exp[-α(2L
1+L
2)]□cos(Δφ)
The interchange optical power signals of the bi-directional light port one 1c of the 3rd wavelength division multiplexer 11 can be expressed as:
P
2(z)＝P
0□exp[-α(z+L
2)]□cos(Δφ)
Wherein, L
1And L
2Be respectively the length of sensor fibre 7 and fibre delay line 5, Δ φ is because the variation of the optical power signals phase place that disturbance causes, and z is the position of disturbance point.
With P
1And P
2Be divided by, can obtain the positional information of disturbance point.
Claims (2)
1. long-distance distributed disturbance locating device of continuous light wavelength-division multiplex type; It is characterized in that; Comprise different first wideband light source (1) and second wideband light sources (2) of centre wavelength of luminous ripple, first wavelength division multiplexer (3), second wavelength division multiplexer (8), the 3rd wavelength division multiplexer (11), first fiber coupler (4), second fiber coupler (6), fibre delay line (5), catoptron (9), index-matching fluid (10) and sensor fibre (7); The bi-directional light port of first wideband light source (1) and second wideband light source (2) links to each other with first bi-directional light port (3a) of first wavelength division multiplexer (3) and the second bi-directional light port (3b) of first wavelength division multiplexer (3) respectively; The 3rd bi-directional light port (3c) of first wavelength division multiplexer (3) links to each other with the first bi-directional light port (4a) of first fiber coupler (4); The 3rd bi-directional light port (4c) of first fiber coupler (4) links to each other with the bi-directional light port of fibre delay line (5); The 4th bi-directional light port (4d) of first fiber coupler (4) links to each other with second bi-directional light port (6b) of second fiber coupler (6) and the first bi-directional light port (11a) of the 3rd wavelength division multiplexer (11) respectively with the second bi-directional light port (4b); First bi-directional light port (6a) of second fiber coupler (6) and the 3rd bi-directional light port (6c) of second fiber coupler (6) link to each other with another bi-directional light port of fibre delay line (5) and the bi-directional light port of sensor fibre (7) respectively; The first bi-directional light port (8a) of second wavelength division multiplexer (8) links to each other with catoptron (9); The second bi-directional light port (8b) of second wavelength division multiplexer (8) links to each other with index-matching fluid (10); The 3rd bi-directional light port (8c) of second wavelength division multiplexer (8) links to each other with another bi-directional light port of sensor fibre (7); The second bi-directional light port (11b) of the 3rd wavelength division multiplexer (11) links to each other with first photoelectric detective circuit (12); The 3rd bi-directional light port (11c) of the 3rd wavelength division multiplexer (11) links to each other with second photoelectric detective circuit (13).
2. the long-distance distributed disturbance localization method of continuous light wavelength-division multiplex type is characterized in that, the centre wavelength that first wideband light source (1) is sent is λ
1The wavelength that sends of light and second wideband light source (2) be λ
2Light respectively in the second bi-directional light port (3b) of the first bi-directional light port (3a) through sending into first wavelength division multiplexer (3) and first wavelength division multiplexer (3); Containing wavelength optical signals exports from the 3rd bi-directional light port (3c) of first wavelength division multiplexer (3); And send in first fiber coupler (4) through the first bi-directional light port (4a) of first fiber coupler (4); Light is divided into two in first fiber coupler (4); Part light is sent into bi-directional light port of fibre delay line (5) through the 3rd bi-directional light port (4c) of first fiber coupler (4) and is passed through another bi-directional light port of fibre delay line (5) and the first bi-directional light port (6a) of second fiber coupler (6) is sent in second fiber coupler (6); Another part light is sent in second fiber coupler (6) through the 4th bi-directional light port (4d) of first fiber coupler (4) and the second bi-directional light port (6b) of second fiber coupler (6); Sending into the light of second fiber coupler (6) exports from its 3rd bi-directional light port (6c); And send in second wavelength division multiplexer (8) through the 3rd bi-directional light port (8c) of sensor fibre (7) and second wavelength division multiplexer (8); The light signal of two kinds of wavelength separates by wavelength in second wavelength division multiplexer (8), and wherein, centre wavelength is λ
1Light through second wavelength division multiplexer (8) the first bi-directional light port (8a) send in the catoptron (9), centre wavelength is λ
2Light send in the index-matching fluid (10) and be absorbed through the second bi-directional light port (8b) of second wavelength division multiplexer (8); Wavelength by catoptron (9) reflection is λ
1Reflected light signal send in second wavelength division multiplexer (8) through the first bi-directional light port (8a) of second wavelength division multiplexer (8), and send in the sensor fibre (7) through the 3rd bi-directional light port (8c) of second wavelength division multiplexer (8), be λ by wavelength
2Back-scattering light and wavelength be λ
1The sensor fibre (7) formed of reflected light in light signal send in second fiber coupler (6) and in second fiber coupler (6) through the 3rd bi-directional light port (6c) of second fiber coupler (6) and be divided into two once more; And export through the first bi-directional light port (6a) and the second bi-directional light port (6b) of second fiber coupler (6) respectively; Light from the first bi-directional light port (6a) of second fiber coupler (6) is sent into first fiber coupler (4) through fibre delay line (5); Light from the second bi-directional light port (6b) of second fiber coupler (6) is sent into first fiber coupler (4); The light of sending into first fiber coupler (4) through fibre delay line (5) through light interferes in first fiber coupler (4) with light from the second bi-directional light port (6b) of second fiber coupler (6), and to export the 3rd wavelength division multiplexer (11) to and isolated centre wavelength by the 3rd wavelength division multiplexer (11) through the second bi-directional light port (4b) of first fiber coupler (4) be λ
1Light and centre wavelength be λ
2Light, centre wavelength is λ
1Light and centre wavelength be λ
2Light send into first photoelectric detective circuit (12) and second photoelectric detective circuit (13) through the second bi-directional light port (11b) and the 3rd bi-directional light port (11c) of the 3rd wavelength division multiplexer (11) respectively; Detected voltage signal of first photoelectric detective circuit (12) and the detected voltage signal of second photoelectric detective circuit (13) are divided by, obtain the positional information of disturbance point.
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| WO2015051758A1 (en) * | 2013-10-12 | 2015-04-16 | 复旦大学 | Method and system using wavelength division multiplexing for eliminating and reducing light diffusion and light reflection interference in interferometric path |
| CN105841795A (en) * | 2016-05-25 | 2016-08-10 | 沈阳安搜科技有限公司 | Novel optical fiber detection fence based on Sagnac interference technology |
| CN106918366A (en) * | 2017-04-16 | 2017-07-04 | 北京工业大学 | The system that a kind of block form multi-wavelength many reference amounts are measured simultaneously |
| US9810557B2 (en) | 2014-02-10 | 2017-11-07 | University Of Central Florida Research Foundation, Inc. | Multicore optical fiber apparatus, methods, and applications |
| CN110530498A (en) * | 2019-08-09 | 2019-12-03 | 国家电网有限公司 | Long range optical cable dynamic monitoring system |
| CN110914645A (en) * | 2017-07-26 | 2020-03-24 | 特拉15私人有限公司 | Distributed optical sensing system and method |
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| CN110530498B (en) * | 2019-08-09 | 2021-08-17 | 国家电网有限公司 | Long-distance optical cable dynamic monitoring system |
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