CN104565826B - Pipeline optical fiber safety monitoring and early warning method and system - Google Patents
Pipeline optical fiber safety monitoring and early warning method and system Download PDFInfo
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Abstract
The invention discloses a safety monitoring and early warning method and system for an oil and gas pipeline. The underground pipeline communication system is characterized in that a communication optical cable is laid around a buried pipeline (1), one core of the communication optical cable is used as a sensing optical fiber (2), one core of the communication optical cable is used as a communication optical fiber (3), an optical fiber relay amplifying device (5) is additionally arranged along the sensing optical fiber (2), and the communication optical fiber (3) is connected with a detection device (6) and a data and control module (7); the data and control module (7) transmits a relay control signal of the relay amplification device (5) through the communication optical fiber (3) to realize real-time adjustment of relay amplification, the relay amplification device can amplify forward transmitted pulse light waves and backward transmitted Rayleigh interference light signals simultaneously, and detected front and back curves are used for removing background noise and improving positioning accuracy. The invention has small influence of background noise, realizes the functions of detecting, identifying, judging and positioning multipoint vibration signals along the pipeline, and has high detection sensitivity, positioning precision and different event identification accuracy.
Description
Technical field
The present invention is a kind of oil-gas pipeline safety monitoring and pre-warning method and system, and coherent rayleigh is based on more particularly, to one kind
（Φ-OTDR）The Distributed Optical Fiber Sensing Techniques of principle, are related to the measurement, the measurement of impact and pipe-line system technology of mechanical oscillation
Field.
Background technology
Pipeline transportation is widely used as a kind of safety, economic means of transportation all over the world.With
Continuing to develop for pipeline industry, the pipe safety accident along the pipeline caused by the factor such as damage from third-party, natural calamity
Happen occasionally, had a strong impact on the safe operation of pipeline.For the safe operation of service conduit, harm pipe safety event is reduced
Generation, pipe safety operation and maintenance technology paid high attention to by various countries scientific and technical personnel.Monitoring pipeline safety early warning technology
It can alarm and position before pipeline is destroyed, to prevent the generation of threat tube security incident, reducing property loss and ring
Border pollution plays an important role.
At present, threatened both at home and abroad along the fiber optic cable monitor pipeline of existing a variety of utilization pipeline layings in one ditch event technology and
Method, but this kind of technology is based primarily upon the pipeline optical fiber safety monitoring and warning skill of traditional OTDR or the research and development of fibre optic interferometer principle
Art.Conventional OTDR technique is applied to monitoring leak from oil gas pipe by Chinese invention patent application number 02145502.3.OTDR technique
It is optical time domain reflection（Optical Time DomainReflectometer）The abbreviation of technology, traditional OTDR is by detection
The back rayleigh scattering and Fresnel reflection signal that are produced in optical fiber judges the trouble point of optical fiber, is mainly used in the event of optical cable
Barrier, the length of optical fiber, the loss of optical fiber and opticalfiber splicing loss etc. are detected.Thus the technology can only detect quiescent dissipation and change
Change slow disturbance, it is impossible to realize the real-time monitoring that event vibration signal is threatened along pipeline.
Chinese invention patent application number 200410020046.6,200610072879.6,200610113044.0,
200720169440.5 grades are based on fibre optic interferometer principle using a plurality of optical fiber and constitute distributed optical fiber vibration sensor monitoring pipe
Vibration signal along road, because pipeline is more complicated along thread environment, ambient noise influence is relatively strong, distributed more widely, thus such
Technology to the detection of multiple spot vibration signal along pipeline, recognize, judge and position it is relatively difficult.
The content of the invention
The purpose of the present invention, which is that invention is a kind of, is based on coherent rayleigh（Φ-OTDR）Principle, using pulsed light to pipeline along
Carry out sectional monitoring, ambient noise influence is small, the detection of realizing multiple spot vibration signal along pipeline, identification, judge and calmly
Bit function, the pipeline optical fiber safety monitoring with very high detection sensitivity, positioning precision and different event recognition accuracy are pre-
Alarm method and system.
Pipeline optical fiber safety monitoring and pre-alarming method is when pulsed light is transmitted in single-mode fiber, due to preparing the material of optical fiber
In there are contaminant particles, or that optical fiber will be made to there is refractive index on microcosmic is different due to the inhomogeneities of optical fiber density itself
Tiny area, each zonule turn into scattering center, to all the winds send the subwave of same frequency, these subwaves are without stationary phase
Position relation, is a random process.If the coherence length long enough of light source, these back rayleigh scattering light will be folded mutually
Plus, constructive or destructive interferences are formed, and form interference pattern.In the range of the coherence length Lc of light source, applied in pipeline with ditch
If in the case that the external environment in the embedded region of optical fiber is constant, detecting the intensity distribution of back rayleigh scattering, obtained intensity point
Cloth pattern is changeless, i.e., back rayleigh scattering light intensity meets certain statistical law.And when external environment changes, will
Certain influence can be produced to the optical fiber in region, so that change the light intensity of Rayleigh scattering in optical fiber, according to statistical law,
Corresponding change can also occur for the relevant pattern of the back rayleigh scattering light now obtained.Changed by analyzing these, you can inspection
The Vibration Condition along optical fiber is measured, so as to realize to a range of monitoring along pipeline.
The principle of the inventive method is as shown in Figure 1.Communication cable is laid with around buried pipeline (1), a wherein core is used
As sensor fibre (2), a core is as communication optical fiber (3), and sensor fibre (2) increases Optical fiber relay amplifying device (5) on the way, leads to
Interrogate optical fiber (3）Connect detection means (6) and data and control module (7)；Data and control module (7) are passed by communication optical fiber (3)
The relaying control signals of defeated relay amplification device (5), realize the real-time regulation to relaying amplification, and relay amplification device can be aligned
It is amplified simultaneously to the pulsed light wave and reverse transfers Rayleigh interference light signal of transmission;Use the anterioposterior curve phase detected
Remove, filter ambient noise, improve positioning precision.
Vibration signal 4 around buried pipeline 1 is acted in pipeline laying in one ditch optical cable on sensor fibre 2, the folding of optical fiber
Penetrate rate, length, core diameter etc. and have minor variations, cause phase at this to change.Light source uses high coherent light in detection means 6
Backward Rayleigh scattering is interfered in source, sensor fibre 2, and due to interference effect, the change of phase finally causes Rayleigh scattering light
The change of intensity.The vibration signal of pipeline is monitored by detecting this change.Data processing control device 7 can be through logical
News optical fiber 3 sends relaying control signals to adjust relaying multiplication factor to relay amplification device 5.
Positioning principle is as shown in figs 2-4.Photodetector detects backward Rayleigh scattering light, and capture card gathers number in real time
According to being divided by the curve adjacent voltage collected, the influence of ambient noise can be effectively reduced, as a result beyond given threshold then
Think the generation for having vibration event, now vibration event is positioned and alarmed.Fig. 2 show the signal three-dimensional collected and shown
It is intended to, the signal collected at optical cable l0 changes with time such as Fig. 3, vibration event judgment formula：
The front and rear voltage V in a period of time is taken to the signal2、V1It is divided by, obtains curve map 4, setting voltage threshold v0, surpass
Go out threshold value v0Alarmed and positioned, vibration event ranging formula：
In formula：
The light velocity in c-- vacuum；
N-- fiber core refractive indexes；
t0- vibration event time of origin.
Realize to overlength oil and gas pipeline monitoring and pre-alarming method, it is characterised in that including procedure below：On sensor fibre edge
Way increase Optical fiber relay amplifying device 5, relaying amplification can simultaneously enter to coherent pulse light wave and backward Rayleigh interference light signal
Row amplification, data and control module 7 can pass through the transmission trunking amplifying device 5 of communication optical fiber 3 according to the power of reflected signal
Relaying control signals, realize the real-time regulation to relaying amplification.Needed in extra long distance Monitoring Pinpelines early warning system to multiple
Relay amplification device is cascaded, and the relaying amplification that the real-time regulation that relaying amplifies avoids cascade is manually operated, while can
Obtain more preferable reflected signal.Operating mode is complicated along overlength oil-gas pipeline, including railway, river, mountain area, built on stilts etc., differently
Section can set different sensitivity in the processing of monitoring and warning system data and control module 102.
Pipeline optical fiber safety monitoring and warning system principle diagram is as shown in Figure 5.Mainly include light source module 100, detection mould
Block 101, data processing and control module 102 and sensing module 103.Light source module 100 to the injected pulse light of sensing module 103,
Backward Rayleigh scattering light in the detection sensor fibre of detection module 101, data processing and control module 102 gather and handled number
According to, and launch relaying control signals to relay amplification device a through communication optical fiber a.Sensing module 103 is picked up by sensor fibre
The vibration signal of pipeline, communication optical fiber transmission trunking control signal.
Laser drives and protection device, narrow linewidth laser, 1 × 2 fiber coupler, power amplifier, optical fiber filter
Ripple device, light pulse modulator, optical fiber circulator are sequentially connected in series, and wherein light pulse modulator needs to connect impulse controller, 1 × 2
Fiber coupler output is than being 99:1, beam intensity ratio is 0.99 1 termination optical fiber filters, and beam intensity ratio is that 0.01 one end is put with passing through
Big reflected signal enters 3 × 3 couplers together；The output end of optical fiber circulator is sequentially connected in series preamplifier, optical fiber filtering
Device, reflected signal and one end of 1 × 2 coupler after filtering access 3 × 3 couplers together, and three of 3 × 3 couplers are defeated
Go out end and sequentially input photodetector, signal conditioner, data acquisition device, signal transacting and control device；Data processing and
Control device output is connect through optical communication device after communication optical fiber a to relay amplification device a, passes sequentially through communication optical fiber b, communication
Optical fiber c to relay amplification device b, relay amplification device c.Laser drives and protection device provides driving for narrow linewidth laser
And Bright Source Protection, narrow linewidth laser exports and exported after continuous light wave through internal insulation device to 1 × 2 fiber coupler, a termination
Optical power amplifier, enters light pulse modulator, pulse-modulator after the continuous light wave of amplification is by optical fiber filter
Modulation duty cycle adjusted by impulse controller, the light pulse after ovennodulation enters sensor fibre by optical fiber circulator
A, light pulse respectively enters sense light after sequentially passing through relay amplification device a, relay amplification device b, relay amplification device c again
Fine b, sensor fibre c, sensor fibre d；The optical signal reflected enters preamplifier after passing through optical fiber circulator, passes through
Optical signal after amplification sequentially passes through optical fiber filter, 3 × 3 fiber couplers, optical fiber photodetector and signal condition
Enter data acquisition device after device, the three road signal entering signal processing and control device processing collected；Signal transacting and
The control device docking collection of letters number sends relaying control signals after judging, the signal passes through optical communication module entry communication optical fiber a
The control to relay amplification device a multiplication factors is realized afterwards, is then passed sequentially through communication optical fiber b, communication optical fiber c and is realized centering
After amplifying device b, the control of relay amplification device c multiplication factors.
Wherein, the structure of relay amplification device is as shown in Figure 6.The relay amplification device is simple in construction, only with an er-doped
Fiber amplifier can just be aligned to be amplified simultaneously to the pulsed light of transmission and the Rayleigh interference signal of reverse transfer, is connected to communication light
Fine a and communication optical fiber b optical communication device output is sequentially connected in series relaying amplification control circuit, power amplifier, power amplifier
Output is connected to sensor fibre b by optical fiber filter.
Optical communication device receives the relaying control signals that signal transacting and control device 7 are sent, and relays amplification control circuit
Power amplifier is controlled, the signal after amplification needs to enter sensor fibre after optical fiber filter.
Described optical fiber is single-mode fiber.
The photovoltaic principals figure of pipeline optical fiber safety monitoring and warning system is as shown in Figure 4.Photovoltaic principals figure shows each module
Between connected mode.Light source module is connected with light circulator by FC interfaces, is connected by FC interfaces with sensing module
Connect；The backward Rayleigh scattering light of sensing module enters detection module by single-mode fiber jumper, scattered light signal after testing module it
After be changed into electric signal by bnc interface enter data processing and control module, mould is mutually sensed through communication optical fiber according to processing data
Block launches relaying control signals.
The processing of data is mainly completed by software.Software section carry out data processing, determine whether warning message with
And relaying control signals to relay amplification device 5 are sent according to the power of signal.
The advantage of the invention is that：
（1）This pipeline optical fiber safety monitoring and pre-alarming method positioning principle is divided by using voltage before and after the curve detected, phase
Than the influence that traditional anterioposterior curve subtracts each other reduction ambient noise that can be bigger, with higher precision and lower wrong report
Rate；
（2）This pipeline optical fiber safety monitoring and warning system utilizes two single-mode fibers in pipeline laying in one ditch communication cable
Vibrating sensor along pipeline is constituted, a single-mode fiber is only needed in the case where being not added with relaying, has saved the same ditch of pipeline
Lay communication cable resource；
（3）The system uses 3 × 3 coupler demodulation principles, reduces polarization decay polarization influence, with very high sensitive
Degree；
（4）The system relaying structure for amplifying is simple, it is only necessary to controllable, Bi-directional amplifier a optical fiber is concatenated on sensor fibre
Amplifier can just be realized to be amplified simultaneously to the pulsed light and the coherent rayleigh scattered lights of reverse transfers of forward direction transmission, and can be with
According to rear orientation light to relaying multiplication factor adjust automatically；
（5）The system is easy to networking, it is possible to achieve the safety monitoring of complex grid；
（6）The distribution type fiber-optic vibrative sensor that the system is used has that electrical insulating property is good, essential safety is reliable, resistance to
The features such as corrosion, it is wider that this makes it have in the environment such as the strong electromagnetics such as petrochemical industry, inflammable, explosive, deep-etching
Application prospect.
Brief description of the drawings
Fig. 1 pipeline optical fiber safety monitoring and pre-alarming method schematic diagrams
Fig. 2 pipeline optical fiber safety monitoring and warning system positioning schematics（1）
Fig. 3 pipeline optical fiber safety monitoring and warning system positioning schematics（2）
Fig. 4 pipeline optical fiber safety monitoring and warning system positioning schematics（3）
Fig. 5 pipeline optical fiber safety monitoring and warning system principle diagrams
Fig. 6 relay amplification device theory diagrams
Fig. 7 photovoltaic principals figures
Fig. 8 test signal voltages-time history
Fig. 9 test result figures
Wherein 1- buried pipelines 2- sensor fibres
3- communication optical fiber 4- vibration events
5- relay amplification device 6- detection means
7- signal transactings and control device 100- light source modules
101- detection module 102- signal transactings and control module
103- sensing module 8a- vibration events a
8b- vibration event b V1- detection curve interior voltage for the previous period
V2Voltage s in a period of time after-detection curve0- vibration event auditory localization cues
l0The point of optical cable one t along-pipeline0- vibration event time of origin
Embodiment
Embodiment is described in further detail to this method and system with reference to the accompanying drawings and detailed description：
The principle of this example is as shown in Figure 1.Vibration signal 4 around buried pipeline 1 is acted in pipeline laying in one ditch optical cable
On sensor fibre 2, refractive index, length, core diameter of optical fiber etc. have minor variations, cause phase at this to change.Detection dress
Light source uses backward Rayleigh scattering in high-coherence light source, sensor fibre 2 to interfere in putting 6, due to interference effect, the change of phase
Change the change for finally causing Rayleigh scattering luminous intensity.The vibration signal of pipeline is monitored by detecting this change.Data
Processing control apparatus 7 can send relaying control signals through communication optical fiber 3 according to the power of detectable signal to relay amplification device 5
To adjust relaying multiplication factor.It can set different sensitive to different location along pipeline in data processing control device 7
Degree.
Pipeline optical fiber safety monitoring and pre-alarming method positioning principle is as shown in figs 2-4.Photodetector detects backward Rayleigh
Scattered light, capture card gathered data is divided by the curve adjacent voltage collected, as a result then thinks to have beyond given threshold to shake
The generation of dynamic event, is now positioned and is alarmed to vibration event.Fig. 2 show the signal schematic three dimensional views collected,
Optical cable l0The signal collected at place changes with time such as Fig. 3, determines whether vibration event ranging formula：s0=| V2/V1
|.The front and rear voltage V interior for a period of time to the signal2、V1It is divided by, obtains curve map 4, setting voltage threshold v0, beyond threshold value v0
Alarmed and positioned, vibration event ranging formula：s0=ct0/2n.C is the light velocity in vacuum in formula, and n rolls over for fiber core
Penetrate rate.
Pipeline optical fiber safety monitoring and warning system architecture is as shown in Figure 5：Laser drives and protection device driving narrow linewidth
Laser sends continuous light wave, and light wave first passes around laser internal optical fiber isolator, and fibre optic isolater can be reduced effectively
Harm of the reflected light to system source, continuous light wave is by 1 × 2 fiber coupler afterwards, and coupler beam intensity ratio is the one of 0.99
End is filtered processing after power amplifier into optical fiber filter, and wave filter can be effectively filtered out in amplification process and produced
Noise, it is filtered after continuous light by light pulse modulators modulate into pulsed light, the light pulse dutycycle after modulation is by pulse
Controller is determined；Pulsed light enters sensor fibre a by optical fiber circulator, sequentially passes through relay amplification device a, relaying amplification dress
B, relay amplification device c are put, amplification afterpulse light enters sensor fibre b, sensor fibre c, sensor fibre d, relays amplification module
Pulsed light and the interference signal being reflected back are amplified simultaneously；The interference signal being reflected back amplifies it through fiber pre-amplifier
Afterwards by optical fiber filter, filtered optical signal and 1 × 2 optical fiber filter beam intensity ratio together enter 3 × 3 for 0.01 one end
Fiber coupler, three output ends of 3 × 3 couplers are changed into electric signal after photodetector, and electric signal is adjusted by signal
Enter data acquisition device after reason device, the data collected carry out subsequent treatment, result in data processing and control device and shown
Show and send relaying control signals after judging, the signal respectively through communication optical fiber a, communication optical fiber b, communication optical fiber c transmit to
Amplification module a, relaying amplification module b, relaying amplification module c are relayed, amplification controller enters according to the signal to fiber amplifier
Row adjustment is to obtain more preferable reflected signal, and the direct impulse light after amplification needs to enter back into sense light after device after filtering
It is fine.
This example relay amplification device structure is as shown in Figure 6.What the reception data processing of optical communication module and control module 7 were sent
Relaying control signals, amplification control circuit is adjusted according to the signal to power amplifier, and the optical signal after amplification passes through
Optical fiber filter is filtered.An erbium-doped fiber amplifier is only needed in the device can just realize to pulsed light and Rayleigh interference
Amplification while signal is, it is necessary to which explanation is the pipeline distance that can monitor according to actual needs of the system come in determining to need
After amplifying device number.
Photovoltaic principals figure is as shown in Figure 7 in this example.Light source module is connected with light circulator by FC interfaces, by FC
Interface is connected with sensing module；The backward Rayleigh scattering light of sensing module enters detection module by single-mode fiber jumper, scattering
Optical signal is changed into electric signal after module and enters data processing and control module by bnc interface after testing, according to processing data
Launch relaying control signals through communication optical fiber phase sensing module.
This example system acquisition to voltage-vs-time primitive curve as shown in figure 8, the curve is gathered in real time.Due to note
Enter the just highly coherent of optical fiber, therefore the curve collected is exactly that pulsed light dissipates in the Rayleigh that sensor fibre internal reflection is returned
Penetrate the result of the interference of light.
The state event location result of this example is as shown in Figure 9.The system can simultaneously be supervised to multiple vibration events of diverse location
Survey, the minimum resolution distance of multiple events is determined by the spatial resolution of system.Vibration event 8a and vibration event 8b is root in figure
The vibration event of the moment diverse location obtained according to above-mentioned positioning principle, 8a transverse axis correspondence time t1, 8b transverse axis correspondence the time
t2, according to formula（2）Vibration event can be calculated.
This example is small to carrying out sectional monitoring, the influence of ambient noise along pipeline using pulsed light through experiment, realizes pipeline
The detection of multiple spot vibration signal along the line, identification, judge and positioning function, with very high detection sensitivity, positioning precision and
Different event recognition accuracy.
Claims (5)
1. a kind of pipeline optical fiber safety monitoring and pre-alarming method, it is characterised in that：Communication cable is laid with around buried pipeline (1),
Using a wherein core as sensor fibre (2), a core is as communication optical fiber (3), and sensor fibre (2) increases Optical fiber relay and put on the way
Big device (5), communication optical fiber (3) connects detection means (6) and data and control module (7)；Data and control module (7) pass through logical
The relaying control signals of optical fiber (3) transmission trunking amplifying device (5) are interrogated, the real-time regulation to relaying amplification, relaying amplification is realized
Device can be simultaneously amplified to the pulsed light wave and reverse transfers Rayleigh interference light signal of forward direction transmission；Use what is detected
Anterioposterior curve is divided by, and filters ambient noise, improves positioning precision,
Positioning principle is as follows：Photodetector detects backward Rayleigh scattering light, capture card real-time data collection, to the song collected
Line adjacent voltage is divided by, and the generation for having vibration event is as a result then thought beyond given threshold, now vibration event is determined
Position and alarm；In optical cable l0The signal that place is collected is changed over time, vibration event judgment formula：
The front and rear voltage V in a period of time is taken to the signal2、V1It is divided by, obtains a curve, setting voltage threshold v0, beyond threshold value
v0Alarmed and positioned, vibration event ranging formula：
In formula：
The light velocity in c-- vacuum；
N-- fiber core refractive indexes；
t0- vibration event time of origin.
2. a kind of pipeline optical fiber safety monitoring and warning system using method as claimed in claim 1, it is characterised in that：Pipeline light
Fine pre-warning system for monitoring mainly includes light source module (100), detection module (101), data processing and control module (102)
With sensing module (103)；Light source module (100) is sensed to sensing module (103) injected pulse light, detection module (101) detection
Backward Rayleigh scattering light in optical fiber, data processing and control module (102) collection and processing data, and through communication optical fiber a
Launch relaying control signals to relay amplification device a；The vibration that sensing module (103) picks up pipeline by sensor fibre is believed
Number, communication optical fiber transmission trunking control signal,
Pipeline optical fiber safety monitoring and warning system is specially：Laser drives and protection device, narrow linewidth laser, 1 × 2 optical fiber
Coupler, power amplifier, optical fiber filter, light pulse modulator, optical fiber circulator are sequentially connected in series, and light pulse modulator is needed
Impulse controller is connected, the output of 1 × 2 fiber coupler is than being 99:1, beam intensity ratio is 0.99 1 termination optical fiber filters, light intensity
Than entering 3 × 3 couplers together with the reflected signal by amplification for 0.01 one end；The output end of optical fiber circulator is sequentially connected in series
Preamplifier, optical fiber filter, reflected signal and one end of 1 × 2 coupler after filtering access 3 × 3 couplers together,
Photodetector, signal conditioner, data acquisition device, signal transacting and control are filled three output ends of 3 × 3 couplers successively
Put；After data processing and control device output meet communication optical fiber a to relay amplification device a through optical communication device, pass sequentially through
Communication optical fiber b, communication optical fiber c, to relay amplification device b, relay amplification device c, laser driving and protection device are narrow line
Wide laser provides driving and Bright Source Protection, and narrow linewidth laser is exported to 1 × 2 light after exporting continuous light wave through internal insulation device
Fine coupler, one end access power amplifier, enters light pulse tune after the continuous light wave of amplification is by optical fiber filter
Device processed, the modulation duty cycle of pulse-modulator is adjusted by impulse controller, and the light pulse after ovennodulation passes through fiber optic loop
Shape device enter sensor fibre a, light pulse sequentially pass through again relay amplification device a, relay amplification device b, relay amplification device c it
After respectively enter sensor fibre b, sensor fibre c, sensor fibre d；The optical signal reflected is laggard by optical fiber circulator
Enter preamplifier, the optical signal after amplification sequentially passes through optical fiber filter, 3 × 3 fiber couplers, optical fiber photoelectricity and visited
Survey after device and signal conditioner into data acquisition device, the three road signal entering signals processing collected and control device
Processing；Signal transacting and the control device docking collection of letters number send relaying control signals after judging, the signal passes through optical communication mould
The control to relay amplification device a multiplication factors is realized after block entry communication optical fiber a, communication optical fiber b is then passed sequentially through, leads to
Optical fiber c is interrogated to realize to relay amplification device b, the control of relay amplification device c multiplication factors.
3. pipeline optical fiber safety monitoring and warning system according to claim 2, it is characterised in that connected between each module
Photovoltaic principals are：Light source module is connected with optical fiber circulator by FC interfaces, is connected by FC interfaces with sensing module；Pass
The backward Rayleigh scattering light for feeling module enters detection module by single-mode fiber jumper, and scattered light signal is changed into after module after testing
Electric signal enters data processing and control module by bnc interface, is launched according to processing data through communication optical fiber phase sensing module
Relaying control signals.
4. pipeline optical fiber safety monitoring and warning system according to claim 2, it is characterised in that the relay amplification device
Structure be：The optical communication device output for being connected to communication optical fiber a and communication optical fiber b is sequentially connected in series relaying amplification control circuit, work(
Rate amplifier, power amplifier output is connected to sensor fibre b by optical fiber filter.
5. pipeline optical fiber safety monitoring and warning system according to claim 4, it is characterised in that：Concatenated on sensor fibre
The erbium-doped fiber amplifier of one Bi-directional amplifier.
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