CN200944148Y - Fiber safety warning optical path device - Google Patents
Fiber safety warning optical path device Download PDFInfo
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- CN200944148Y CN200944148Y CN 200620124264 CN200620124264U CN200944148Y CN 200944148 Y CN200944148 Y CN 200944148Y CN 200620124264 CN200620124264 CN 200620124264 CN 200620124264 U CN200620124264 U CN 200620124264U CN 200944148 Y CN200944148 Y CN 200944148Y
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Abstract
The utility model is an optical fiber safety warning light path device for safety warning of buried pipelines or structures, relating to the technical field of measuring of mechanical vibration, measuring of impact and pipeline system. The utility model is formed by a polarization modulator [202] in series connection between a continuous monochrome laser [101] and a wave combiner and separator [203] connected by the optical fiber, wherein the wave combiner and separator [203] and a wave combiner and separator [204], an optical fiber [1] and an optical fiber [2] form the Mach-Zehnder optical fiber interferometer, the wave combiner and separator [203] is separately connected with a photoelectric detection processing circuit [207] by two optical fiber, a polarization controller [201] connected with the photoelectric detection processing circuit [207] to output is separately connected by electric signal lines with a phase modulator [206] and the polarization modulator [202] in series connection with the optical fiber [1] or [2], a phase controller [205] connected with the photoelectric detection processing circuit [207] to output is connected by electric signal lines with the phase modulator [206] in series connection with the optical fiber [1] or [2]. The device has high precision and long distance of detection and orientation, and stable and credible monitoring, no undetected.
Description
Technical field
The utility model is the optical fiber safety early warning light path device of a kind of buried pipeline or structures safe early warning.Relate to the measurement of mechanical vibration, the measurement and the piping system technical field of impact.
Background technology
For materials such as oil, rock gas, product oil, coal slurry and water, pipeline transportation is a kind of safe, economic and means of transportation efficiently, in global carrier, bringing into play more and more important effect, especially at oil, finished product oil and gas these have inflammable and explosive and energy substance transportation that transaction value is high in occupy very important position, in our country, annual newly-built several thousand kilometers at least pipeline be we can say, pipeline is the main artery of energy transportation.The oil of pipeline transportation, the existing high transaction value of finished product oil and gas also have inflammable and explosive this characteristic, pipeline is in case leak, combustion explosion very easily takes place in leakage region, not only influence the safety in production of pipeline industry, cause enormous economic loss, and all edge line people's property and life security in serious threat.In addition, the pipeline leakage can't be estimated especially to the harm that peripheral ecologic environment causes.
Since pipeline has been arranged, the destruction that comes from the outside has just been arranged also.Especially in the last few years, rise of the oil price, under the driving of interests, the lawless person is possessed with a lust for gain, drilling hole of oil stolen, robber's gas on pipeline; Capital construction starts in a large number, and pipeline construction site along the line is seen everywhere; In addition, disasteies such as landslide, rubble flow take place again and again, the production safety that these are all constantly threatening pipeline, and wherein drilling hole of oil stolen and illegal construction become the primary factor of threat tube safety in production.
According to incompletely statistics, only China destroys the pipe leakage that causes because of the external world or explode last over thousands of time every year, and direct economic loss reaches several hundred million yuan, and indirect losses such as environmental disruption and social influence can't be estimated especially.For preventing outer bound pair pipeline destroyed, the pipeline transportation industry has dropped into lot of manpower and material resources every year, but still can't effectively prevent and stop destruction.The safety in production form of pipeline transportation industry is very severe, and it is extremely urgent to seek means and the method for guaranteeing the pipeline transportation safety in production.
Along with the development of pipeline transportation industry, various pipeline transportation safety monitoring technologies are also in continuous development, and present existing pipe safety production monitoring technology mainly contains two classes.One: the monitoring technology after the pipe leakage incident takes place, this technology mainly contains " tube fluid mechanical state detection technique and distribution type fiber-optic temperature and stress monitoring technology ".Tube fluid mechanical state detection technique is to gather signals such as the flow of fluid in the pipeline, temperature and pressure in real time, carry out pipeline leakage testing and location, this technology is subjected to the effects limit such as performance of fluid behaviour, delivery technology and testing tool in the pipeline, sensitivity and bearing accuracy to line leakage are lower, and this class technology comprises: pressure gradient method, negative pressure wave method, flow equilibrium method.Distribution type fiber-optic temperature and stress monitoring technology are the positions that the medium that utilizes the nonlinear characteristic of optical fiber (Ramam effect and brillouin effect) to gather pipe leakage is in real time determined leakage point to the temperature effect and the shock stress of optical fiber, and this technology is subjected to the distance limit of the structure of optical cable and optical cable and leakage point and influences monitoring effect.They are two years old, prevention monitoring technology before the pipeline damage incident takes place, pipeline damage early warning technology just, existing such technology mainly is " technology of acoustic wave monitoring " at present, this technology is to utilize sound wave along the pipeline transmission principle, an active sensor is being installed every about 1 kilometer, picking up pipeline voice signal along the line is analyzed, determine event property, and then the incident of destroying pipeline found in advance, but each senser element must be equipped with a cover electric supply installation and a communicator, not only increases the investment and the maintenance cost of equipment, and these facilities are also destroyed easily itself, and device can not normally be moved.
At the problem that existing pipe safety monitoring technology exists, Australia has patent to propose based on Mach-Zehnder (Mach-Zehnder) fibre optic interferometer principle, with the technical scheme of optical fiber sense vibration.This invention is a breakthrough to the line target or the large-area appearance target safe early warning of long distance, but not enough be the light path system instability of this invention, be difficult to effectively work.
The utility model content
The purpose of this utility model is to design a kind of line target or large-area appearance to long distance to mark optical fiber safety early warning light path device stable, reliable, effective safe early warning.
Problem at existing pipe safety monitoring technology existence, this has proposed a kind of based on two Mach-Zehnders (Mach-Zehnder) fibre optic interferometer principle that has adopted phase fading control and polarization decay control technology, eliminated the signal blanking that causes because of phase fading and polarization decay, formed two-way and interfered laser modulation signal relative transmission and light channel structure of picking up at the interferometer both-end on interferometer synchronously with stable phase angle and stable polarized attitude.Utilize with the pipeline laying in one ditch or be laid in common communications optical fiber in the optical cable of early warning target under peripherally as the interference arm and the Transmission Fibers of interferometer, and then the soil vibration detecting sensor of formation continuous distribution formula, pick up near the vibration signal of the soil along the line pipeline, and go out near the occurrence positions of soil the vibration event along the line pipeline according to the transmission time difference analytical calculation of two-way laser signal.Be defeated by signal recognition system again and determine to cause the character and the classification of soil vibration event.By means of pipeline integrated in generalized information management platform Geographic Information System along the line (GIS) and GPS (GPS) and communication system, the personnel of pipeline control center can in time command, scheduled maintenance repairing personnel arrive in the incident scene fast timely and accurately, the incident of breaking ground that prevention in time may work the mischief to pipe safety or the intrusion event of Terminal Area Facilities, the seamless real-time monitoring of realization and Terminal Area Facilities along the line to pipeline, play the effect of pipe safety monitoring and early warning, avoid the generation of pipe safety accident.
Though the utility model also comprises with the pipeline laying in one ditch or spreads on the three piece optical fiber 1,2,3 of structures under peripherally, forms Mach-Zehnder (Mach-Zehnder) fibre optic interferometer and laser instrument 101 by channel join-splitting device 203, channel join-splitting device 204 with optical fiber 1,2, it is characterized in that it has three kinds of concrete formations, i.e. phase control or Polarization Control or polarization and phase control.Polarization Control or polarization are that light polarization modulator 202 is connected between the continuous mono-colour laser 101 and channel join-splitting device 203 that is connected by optical fiber with the common ground of phase control in three kinds of concrete formations, channel join-splitting device 203 connects three optical fiber 1 respectively, 2,3 to channel join-splitting device 204, channel join-splitting device 203, channel join-splitting device 204 and optical fiber 1, optical fiber 2 is formed Mach-Zehnder (Mach-Zehnder) fibre optic interferometer, channel join-splitting device 203 is met the Photoelectric Detection pipe y of Photoelectric Detection treatment circuit 207 respectively by two optical fiber, Photoelectric Detection pipe x, divide two kinds of formations afterwards, or light polarization modulator 202 connects Polarization Controller 201 by electric wire, the Polarization Controller 201 that connects 207 outputs of Photoelectric Detection treatment circuit is connect the phase-modulator 206 that is connected in optical fiber 1 or 2 by electric wire, or light polarization modulator 202 connects Polarization Controller 201 by electrical signal line, the Polarization Controller 201 that connects 207 outputs of Photoelectric Detection treatment circuit connects the phase-modulator 206 that is connected in optical fiber 1 or 2 by electrical signal line, and the phase controller 205 that connects 207 outputs of Photoelectric Detection treatment circuit is simultaneously connect the phase-modulator 206 that is connected in optical fiber 2 or 1 by electrical signal line.
Phase control then is that continuous mono-colour laser 101 directly engages channel-splitting filter 203, channel join-splitting device 203 connects three optical fiber 1,2,3 respectively to channel join-splitting device 204, channel join-splitting device 203, channel join-splitting device 204 are formed Mach-Zehnder (Mach-Zehnder) fibre optic interferometer with optical fiber 1, optical fiber 2, channel join-splitting device 203 meets Photoelectric Detection pipe y, the Photoelectric Detection pipe x of Photoelectric Detection treatment circuit 207 respectively by two optical fiber, and the phase controller 205 that connects 207 outputs of Photoelectric Detection treatment circuit is connect the phase-modulator 206 that is connected in optical fiber 2 or 1 by electrical signal line.
Wherein laser instrument 101 is continuous mono-colour laser.1,2 and 3 is three optical fiber, and wherein optical fiber 1,2 is interference optical fiber, optical fiber 3 Transmission Fibers, Mach-Zehnder (Mach-Zehnder) fibre optic interferometer that channel join-splitting device 203,204 and optical fiber 1,2 are formed.Polarization Control or polarization and phase control are the one-wavelength lasers of continuous mono-colour laser 101 emissions, arrive Polarization Controller 201 by optical fiber, be divided into two-way by optical fiber to the one-wavelength laser of channel join-splitting device 203: wherein one road laser is by the 203 end incidents of Mach-Zehnder (Mach-Zehnder) optical fiber channel join-splitting device, close ripple and form the interference light wave at channel join-splitting device 204 ends, interfere light wave to pass channel join-splitting device 203 back, pass to a Photoelectric Detection pipe y in the Photoelectric Detection treatment circuit 207 by optical fiber again by optical fiber 3; Wherein another road laser passes to channel join-splitting device 204 by optical fiber 3, by the 204 end incidents of Mach-Zehnder (Mach-Zehnder) optical fiber channel join-splitting device, close ripple and form the interference light wave at channel join-splitting device 203 ends, interfere light wave to pass to another Photoelectric Detection pipe x in the photoelectric detective circuit 207 by optical fiber; Polarization Controller 201 is formed polarization decay closed-loop control ring with light polarization modulator 202 and Photoelectric Detection treatment circuit 207, make on Mach-Zehnder (Mach-Zehnder) fibre optic interferometer and to propagate and form the two-way interference light wave polarization attitude difference of interfering and be stabilized on the needed angle value of system, wherein, between Polarization Controller 201 and the light polarization modulator 202 and be electrical signal line between Polarization Controller 201 and the Photoelectric Detection treatment circuit 207; Phase control then is that continuous mono-colour laser 101 directly engages channel-splitting filter 203, channel join-splitting device 203 connects three optical fiber 1,2,3 respectively to channel join-splitting device 204, channel join-splitting device 203, channel join-splitting device 204 are formed Mach-Zehnder (Mach-Zehnder) fibre optic interferometer with optical fiber 1, optical fiber 2, channel join-splitting device 203 meets Photoelectric Detection pipe y, the Photoelectric Detection pipe x of Photoelectric Detection treatment circuit 207 respectively by two optical fiber, and the phase controller 205 that connects 207 outputs of Photoelectric Detection treatment circuit is connect the phase-modulator 206 that is connected in optical fiber 2 or 1 by electrical signal line.Phase controller 205 is formed phase fading closed-loop control ring with photoelectric signal processing circuit 207, phase-modulator 206, make on Mach-Zehnder (Mach-Zehnder) fibre optic interferometer and to propagate and form the two-way of interfering and interfere the phase difference value of light wave to be stabilized on the needed phase value of system, wherein, between phase controller 205 and the phase-modulator 206 and be electrical signal line between phase controller 205 and the Photoelectric Detection treatment circuit 207; When polarization and phase control are controlled simultaneously, two-way interference light wave polarization attitude difference is stabilized on the needed angle value of system, phase difference value is stabilized on the needed phase value of system.
Like this, utilize with the pipeline laying in one ditch or spread on around the structures three common communications optical fiber in the subterranean cable as the optical fiber among Fig. 11,2 and 3, the soil vibration detecting sensor of then forming the continuous distribution formula, sensor picks up near the vibration signal of the soil along the line of pipeline, the soil vibration signal passes to Photoelectric Detection pipe x and y via different light paths respectively with the different time, but according to the transmission time difference then analysis meter calculate near the occurrence positions of soil the vibration event along the line pipeline.
Therefore this light path device can effectively detect near the optical cable 3 meters with interior any soil vibration signal and accurate decision event character; Event detection bearing accuracy height, bearing accuracy can reach ± and 10 meters, monitoring distance is long, and the monitoring distance of single cover system can reach about 120 kilometers; And monitoring is stable, reliable, no omission; Fundamentally solved the unstable difficult problem of light path of buried pipeline, structures or ground structures, critical facility and the regional optical-fiber security early-warning of avoiding destroying.
Description of drawings
Fig. 1 phase control light path device theory diagram
Fig. 2 Polarization Control light path device theory diagram
Fig. 3 polarization and phase control light path device theory diagram
101-laser instrument 201-Polarization Controller wherein
202-light polarization modulator 203-channel join-splitting device
204-channel join-splitting device 205-phase controller
206-phase-modulator 207-Photoelectric Detection treatment circuit
Embodiment
Embodiment. embodiment of the present utility model is described and the utility model is further described with this example.This example is an experimental prototype, and it constitutes as shown in Figure 3.Thick connecting line is an optical fiber among the figure, and thin connecting line is an electric wire.Specifically constitute: channel join-splitting device 203 and channel join-splitting device 204 models: the WDM-A-2 * 2-1550-1-FC/UPC-3*54 of Lang Guang company; Polarization Controller 201: select NI PXI-1042 8-Slot 3UCPU:PXI-8186 P4 2.2 I/O:NI PXI-5112,2 channel, 100MHz, 32MB/Channel, 8-bit; PXI-6111 A/D 2channel 12bit, D/A 2channel 12bit; Phase controller 205: select NI PXI-1050, PXI/SCXI CPU:PXI-8187 P4M 2.5G PXI-6120 A/D 4 channel16bit, D/A2 channel 16-bit; Single-frequency laser 101 selects model: KOHERAS ADJUSTIK HP E15; Light polarization modulator 202:OZ Optics EPC-400 EPC DRIVER-04-RS232; Phase-modulator 206: select the Optics fice PZ-STD-FC/PC of OZ company; Photoelectric Detection treatment circuit 207: general photoamplifier circuit, 2 road optical fiber input ports, input range :-20～-45dBm, 2 road electricity delivery outlets, output area :-3V～+ 3V.
The one-wavelength laser of continuous mono-colour laser 101 emissions, arrive Polarization Controller 201 by optical fiber, be divided into two-way by optical fiber to the one-wavelength laser of channel join-splitting device 203: wherein one road laser is by the 203 end incidents of Mach-Zehnder (Mach-Zehnder) optical fiber channel join-splitting device, close ripple and form the interference light wave at channel join-splitting device 204 ends, interfere light wave to pass channel join-splitting device 203 back, pass in the Photoelectric Detection treatment circuit 207-individual Photoelectric Detection pipe y by optical fiber again by optical fiber 3; Wherein another road laser passes to channel join-splitting device 204 by optical fiber 3, by the 204 end incidents of Mach-Zehnder (Mach-Zehnder) optical fiber channel join-splitting device, close ripple and form the interference light wave at channel join-splitting device 203 ends, interfere light wave to pass to another Photoelectric Detection pipe x in the photoelectric detective circuit 207 by optical fiber; Polarization Controller 201 is formed polarization decay closed-loop control rings with light polarization modulator 202 and Photoelectric Detection treatment circuit 207, makes to propagate on Mach-Zehnder (Mach-Zehnder) fibre optic interferometer and form the two-way interference light wave polarization attitude difference of interfering and be stabilized on the needed angle value of system; Phase control then is that continuous mono-colour laser 101 directly engages channel-splitting filter 203, channel join-splitting device 203 connects three optical fiber 1,2,3 respectively to channel join-splitting device 204, channel join-splitting device 203, channel join-splitting device 204 are formed Mach-Zehnder (Mach-Zehnder) fibre optic interferometer with optical fiber 1, optical fiber 2, channel join-splitting device 203 meets Photoelectric Detection pipe y, the Photoelectric Detection pipe x of Photoelectric Detection treatment circuit 207 respectively by two optical fiber, and phase controller 205 is connect phase-modulator 206 and the Photoelectric Detection treatment circuit 207 that is connected in optical fiber 2 or 1 respectively by electrical signal line afterwards.Phase controller 205 is formed phase fading closed-loop control rings with photoelectric detective circuit 207, phase-modulator 206, makes to propagate on Mach-Zehnder (Mach-Zehnder) fibre optic interferometer and form the two-way of interfering and interfere the phase difference value of light wave to be stabilized on the needed phase value of system.
This device is equipped with positioning system, signal recognition system through the actual use of certain pipeline, test, to ground break ground excavation, touch pipeline, welding on pipeline, punching all can predict, bearing accuracy height, event property accuracy of judgement, there is no omission, prove that this light path system is stable, reliable, effective.
This device has very high sensitivity to the detection of soil vibration signal, can effectively detect near the optical cable 3 meters with interior any soil vibration signal; Event detection bearing accuracy height, bearing accuracy can reach ± and 10 meters, satisfy pipeline maintenance repairing requirement fully.The monitoring distance of unitary device can reach about 120 kilometers, has communication function by means of system itself, and multiple devices link together and can form a complete seamless monitoring network, so the monitoring distance of native system can be decided as required.
This device not only is applicable to the safety precaution and the early warning of pipeline; also be applicable to the safety precaution and the early warning of other critical facility and important area, such as: critical facilitys such as communications optical cable, means of transportation, historic reservation, armory, emphasis office and essential industry plant area and regional safeguard protection and strick precaution early warning.
Claims (4)
1. the optical fiber safety early warning light path device of buried pipeline or structures safe early warning, comprise with the pipeline laying in one ditch or spread on the three piece optical fiber [1] of structures under peripherally, [2], [3], by channel join-splitting device [203], channel join-splitting device [204] and optical fiber [1], [2] form Mach-Zehnder optical fiber interferometer and laser instrument [101], it is characterized in that light path system is by laser instrument [101], Polarization Controller [201], light polarization modulator [202], channel join-splitting device [203], [204], Photoelectric Detection treatment circuit [207] is formed, light polarization modulator [202] is connected between the laser instrument [101] and channel join-splitting device [203] that is connected by optical fiber, channel join-splitting device [203] connects three optical fiber [1] respectively, [2], [3] to channel join-splitting device [204], channel join-splitting device [203], channel join-splitting device [204] and optical fiber [1], optical fiber [2] is formed Mach-Zehnder optical fiber interferometer, channel join-splitting device [203] connects Photoelectric Detection treatment circuit [207] respectively by two optical fiber, and the Polarization Controller [201] that connects Photoelectric Detection treatment circuit [207] output is connect phase-modulator [206] and the light polarization modulator [202] that is connected in optical fiber [1] or [2] respectively by electrical signal line; Laser instrument [101] emitted laser, pass to light polarization modulator [202] by optical fiber, the laser that is passed to channel join-splitting device [203] by optical fiber again is divided into two-way: wherein one road laser is by the incident of channel join-splitting device [203] end, close ripple and form the interference light wave at channel join-splitting device [204] end, interfere light wave to pass channel join-splitting device [203] back by optical fiber [3] again, pass to Photoelectric Detection treatment circuit [207] by optical fiber again; Wherein another road laser passes to channel join-splitting device [204] by optical fiber [3], by the incident of channel join-splitting device [204] end, closes ripple and forms the interference light wave at channel join-splitting device [203] end, interferes light wave to pass to Photoelectric Detection treatment circuit [207] by optical fiber; Polarization Controller [201] is formed polarization decay closed-loop control ring with light polarization modulator [202] and Photoelectric Detection treatment circuit [207].
2. the optical fiber safety early warning light path device of buried pipeline or structures safe early warning, comprise with the pipeline laying in one ditch or spread on the three piece optical fiber [1] of structures under peripherally, [2], [3], by channel join-splitting device [203], channel join-splitting device [204] and optical fiber [1], [2] form Mach-Zehnder optical fiber interferometer and laser instrument [101], it is characterized in that light path system is by laser instrument [101], phase controller [205], phase-modulator [206], channel join-splitting device [203], [204], Photoelectric Detection treatment circuit [207] is formed, laser instrument [101] is received channel join-splitting device [203] by optical fiber, connect three optical fiber [1] behind the channel join-splitting device [203] respectively, [2], [3] to channel join-splitting device [204], channel join-splitting device [203], channel join-splitting device [204] and optical fiber [1], optical fiber [2] is formed Mach-Zehnder optical fiber interferometer, channel join-splitting device [203] connects Photoelectric Detection treatment circuit [207] respectively by two optical fiber, and the phase controller [205] that connects Photoelectric Detection treatment circuit [207] output is connect the phase-modulator [206] that is connected in optical fiber [2] or [1] by electrical signal line; Laser instrument [101] emitted laser, pass to phase controller [205] by optical fiber, the laser that is passed to channel join-splitting device [203] by optical fiber is divided into two-way: wherein one road laser is by the incident of channel join-splitting device [203] end, close ripple and form the interference light wave at channel join-splitting device [204] end, interfere light wave to pass channel join-splitting device [203] back by optical fiber [3] again, pass to Photoelectric Detection treatment circuit [207] by optical fiber again; Another road laser passes to channel join-splitting device [204] by optical fiber [3], by the incident of channel join-splitting device [204] end, closes ripple and forms the interference light wave at channel join-splitting device [203] end, interferes light wave to pass to Photoelectric Detection treatment circuit [207] by optical fiber; Phase controller [205] is formed phase fading closed-loop control ring with phase-modulator [206] and Photoelectric Detection treatment circuit [207].
3. the optical fiber safety early warning light path device of buried pipeline or structures safe early warning, comprise with the pipeline laying in one ditch or spread on the three piece optical fiber [1] of structures under peripherally, [2], [3], by channel join-splitting device [203], channel join-splitting device [204] and optical fiber [1], [2] form Mach-Zehnder optical fiber interferometer and laser instrument [101], it is characterized in that light path system is by laser instrument [101], Polarization Controller [201], phase controller [205], light polarization modulator [202], phase-modulator [206], channel join-splitting device [203], [204], Photoelectric Detection treatment circuit [207] is formed, light polarization modulator [202] is connected between the laser instrument [101] and channel join-splitting device [203] that is connected by optical fiber, connect three optical fiber [1] behind the channel join-splitting device [203] respectively, [2], [3] to channel join-splitting device [204], channel join-splitting device [203], channel join-splitting device [204] and optical fiber [1], optical fiber [2] is formed Mach-Zehnder optical fiber interferometer, channel join-splitting device [203] connects Photoelectric Detection treatment circuit [207] respectively by two optical fiber, one output of Photoelectric Detection treatment circuit [207] connects Polarization Controller [201], Polarization Controller [201] connects phase-modulator [206] and the light polarization modulator [202] that is connected in optical fiber [1] or [2] respectively by electrical signal line, and the phase controller [205] that connects another output of Photoelectric Detection treatment circuit [207] is connect the phase-modulator [206] that is connected in optical fiber [2] or [1] by electrical signal line; Laser instrument [101] emitted laser, pass to light polarization modulator [202] by optical fiber, the one-wavelength laser that is passed to channel join-splitting device [203] by optical fiber is divided into two-way: wherein one road laser is by the incident of channel join-splitting device [203] end, close ripple and form the interference light wave at channel join-splitting device [204] end, interfere light wave to pass channel join-splitting device [203] back by optical fiber [3] again, pass to Photoelectric Detection treatment circuit [207] by optical fiber again; Wherein another road laser passes to channel join-splitting device [204] by optical fiber [3], by the incident of channel join-splitting device [204] end, closes ripple and forms the interference light wave at channel join-splitting device [203] end, interferes light wave to pass to Photoelectric Detection treatment circuit [207] by optical fiber; Phase controller [205] is formed phase fading closed-loop control ring with Photoelectric Detection treatment circuit [207], phase-modulator [206]; Polarization Controller [201] is formed polarization decay closed-loop control ring with light polarization modulator [202] and Photoelectric Detection treatment circuit [207].
4. according to claim 1 or 2 or 3 described optical fiber safety early warning light path devices, it is characterized in that described laser instrument [101] is continuous monochromatic formula laser instrument.
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| CN 200620124264 CN200944148Y (en) | 2006-06-30 | 2006-06-30 | Fiber safety warning optical path device |
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| CN 200620124264 CN200944148Y (en) | 2006-06-30 | 2006-06-30 | Fiber safety warning optical path device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105187121A (en) * | 2015-06-18 | 2015-12-23 | 天津纤测道客科技发展有限公司 | Communication optical cable fault point surface position location method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105187121A (en) * | 2015-06-18 | 2015-12-23 | 天津纤测道客科技发展有限公司 | Communication optical cable fault point surface position location method and system |
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