CN104456086B - pipeline safety early warning system and method - Google Patents
pipeline safety early warning system and method Download PDFInfo
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- CN104456086B CN104456086B CN201310418381.0A CN201310418381A CN104456086B CN 104456086 B CN104456086 B CN 104456086B CN 201310418381 A CN201310418381 A CN 201310418381A CN 104456086 B CN104456086 B CN 104456086B
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Abstract
The invention discloses a kind of pipeline safety early warning system and method, belong to Monitoring Pinpelines field.The system includes：First laser device, fibre optic interferometer, for producing first to interfere light wave and the second interference light wave；Photoelectric conversion module, for the first interference light wave and the second interference light wave to be converted into the first electric signal and the second electric signal；First optical fiber；Pulse laser generation device, for providing pulse laser；Coupling module, for pulse laser to be input into the first optical fiber, and exports backward coherent rayleigh scattering light；Photodetector, for carrying out opto-electronic conversion to coherent rayleigh scattering light, obtains the 3rd electric signal；Processing module is used to process the first electric signal, the second electric signal and the 3rd electric signal, obtains the vibration signal that different vibration sources are produced.So as to carry out early warning to pipe safety.
Description
Technical field
The present invention relates to Monitoring Pinpelines field, more particularly to a kind of pipeline safety early warning system and method.
Background technology
Type optical fibre pipeline safe early-warning system is a kind of vibration detecting system based on Fibre Optical Sensor, by detecting conduit fittings
Whether vibration event is had, to be judged rapidly events such as oil and gas leakage, neighbouring mechanical execution and artificial destructions and accurately
Positioning, so that it is guaranteed that pipe safety runs.
Said system is using the bidirectional Mach Zehnder interferometer realization with retransmission function, the bidirectional Mach Zehnder interferometer
By two channel join-splitting devices, and it is connected to the optical fiber composition between two channel join-splitting devices, and one of channel join-splitting device and treatment
Module is electrically connected.Processing module is realized to vibration event by analyzing the time delay of the two paths of signals of transmitted in both directions in interferometer
Positioning.Generally, due to monitoring distance is more long, usually there is the simultaneous situation of a lot of vibration events in monitoring section, this
The vibration signal that sample difference vibration source triggers staggeredly occurs in time, forms the second mixing vibration signal sequence of time domain mixing.
Second mixing vibration signal sequence is re-started sorting combination by system according to the time delay value of two paths of signals, has rebuild multiple vibrations
Event, and event is alarmed.
Realize it is of the invention during, inventor find prior art at least there is problems with：
Because time delay is estimated to need to consider precision, so easily producing error, it is thus possible to different event can be caused in place
That puts is fuzzy so that the adjacent events in the range of certain distance are mistaken for an event, or single event is split off
Situation into multiple affair alarms occurs, and system errors is alarmed.
The content of the invention
In order to solve in the prior art to pipe safety prewarning when, easily produce false alarm problem, the present invention implement
Example provides a kind of pipeline safety early warning system and method.The technical scheme is as follows：
On the one hand, a kind of pipeline safety early warning system is the embodiment of the invention provides, the system includes：
First laser device, for providing first laser；
Fibre optic interferometer, for receiving the first laser, and produces first to interfere light wave and the second interference light wave；
Photoelectric conversion module, for the described first interference light wave and the second interference light wave to be converted into the first electric signal
With the second electric signal；
Along the first optical fiber of pipe laying；
Pulse laser generation device, for providing pulse laser；
Coupling module, for the pulse laser to be input into first optical fiber, and exports the pulse laser described
The backward coherent rayleigh scattering light produced when being transmitted in the first optical fiber；
Photodetector, for carrying out opto-electronic conversion to coherent rayleigh scattering light, obtains the 3rd electric signal；
Processing module, for processing the 3rd electric signal, obtains the first mixing vibration signal sequence, described
One mixing vibration signal sequence is a sequence for phase place change disturbance；According to first electric signal and second telecommunications
Number, obtain the second mixing vibration signal sequence；According to the intensity that the first mixing vibration signal sequence is disturbed, it is determined that difference is disturbed
The vibration source of dynamic position, obtains the number of vibration source and the position of different vibration sources；The position of number and different vibration sources according to the vibration source
Put, the second mixing vibration signal sequence is divided into the vibration signal that different vibration sources are produced.
In a kind of implementation of the embodiment of the present invention, the pulse laser generation device includes second laser harmony
Optical modulator.
In another implementation of the embodiment of the present invention, the pulse laser generation device includes pulse laser.
In another implementation of the embodiment of the present invention, the coupling module is coupler or circulator.
In another implementation of the embodiment of the present invention, the system also includes：
Erbium-doped fiber amplifier, for carrying out energy amplification to the pulse laser, the erbium-doped fiber amplifier is located at
Between the pulse laser generation device and the coupling module.
In another implementation of the embodiment of the present invention, the fibre optic interferometer is Mach-Zehnder optical fiber interferometer,
The Mach-Zehnder optical fiber interferometer includes：
First channel join-splitting device and the second channel join-splitting device, between first channel join-splitting device and second channel join-splitting device
And along the second optical fiber of pipe laying, the 3rd optical fiber and the 4th optical fiber.
In another implementation of the embodiment of the present invention, the system also includes：
Light polarization modulator between the first laser device and first channel join-splitting device, and located at the polarization
Polarization Controller between modulator and the processing module.
In another implementation of the embodiment of the present invention, the system also includes：
The second phase modulation that the first phase modulator connected with second optical fiber is connected with the 3rd optical fiber
Device and the phase controller of processing module connection, the phase controller and the first phase modulator and described the
An electrical connection in two phase modulator, the Polarization Controller is adjusted with the first phase modulator and the second phase
Another electrical connection in device processed.
In another implementation of the embodiment of the present invention, the first laser device is continuous mono-colour laser.
On the other hand, the embodiment of the present invention additionally provides a kind of pipe safety prewarning method, and methods described includes：
First laser is provided；
The first laser is received using fibre optic interferometer, and produces first to interfere light wave and the second interference light wave；
Described first interference light wave and the second interference light wave are converted into the first electric signal and the second electric signal；
According to first electric signal and second electric signal, the second mixing vibration signal sequence is obtained；
Pulse laser is input into along the first optical fiber of pipe laying, and exports the pulse laser and transmitted in the optical fiber
The backward coherent rayleigh scattering light for producing；
Opto-electronic conversion is carried out to coherent rayleigh scattering light, the 3rd electric signal is obtained；
3rd electric signal is processed, the first mixing vibration signal sequence, the first mixing vibration letter is obtained
Number sequence is a sequence for phase place change disturbance；
According to the intensity that the first mixing vibration signal sequence is disturbed, the vibration source of different disturbance locations is determined, shaken
The position of the number in source and different vibration sources；
The position of number and different vibration sources according to the vibration source, difference is divided into by the second mixing vibration signal sequence
The vibration signal that vibration source is produced.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
Pipe vibration event is detected by using fibre optic interferometer, obtains the second mixing vibration signal sequence, together
When, the backward coherent rayleigh scattering light for transmitting formation in a fiber according to pulse laser is detected to pipe vibration event, is obtained
To the first mixing vibration signal sequence, according to the first mixing vibration signal sequence and the second mixing vibration signal sequence, obtain not
With the vibration signal that vibration source is produced, the vibration event that different vibration sources are produced was accurately distinguished when both ensure that detection, to ensure
Sample frequency so that safe early warning is more accurate.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to that will make needed for embodiment description
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is the structural representation of the pipeline safety early warning system that the embodiment of the present invention one is provided；
Fig. 2 is the structural representation of the pipeline safety early warning system that the embodiment of the present invention two is provided；
Fig. 3 is the second mixing vibration signal sequence schematic diagram that the embodiment of the present invention two is provided；
Fig. 4 is the vibration signal sequence diagram after the separation that the embodiment of the present invention two is provided；
Fig. 5 is the pipe safety prewarning method flow diagram that the embodiment of the present invention three is provided.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
Embodiment one
A kind of pipeline safety early warning system is the embodiment of the invention provides, referring to Fig. 1, the system includes：A kind of pipeline peace
Full early warning system, the system includes：
First laser device 101, for providing first laser；
Fibre optic interferometer 102, for receiving first laser, and produces first to interfere light wave and the second interference light wave；
Photoelectric conversion module 103, for the first interference light wave and the second interference light wave to be converted into the first electric signal and the
Two electric signals；
Along the first optical fiber 104 of pipe laying；
Pulse laser generation device 105, for providing pulse laser；
Coupling module 106, transmits for pulse laser being input into the first optical fiber, and exporting pulse laser in the first optical fiber
When produce backward coherent rayleigh scattering light；
Photodetector 107, for carrying out opto-electronic conversion to coherent rayleigh scattering light, obtains the 3rd electric signal；
Processing module 108, for processing the first electric signal, the second electric signal and the 3rd electric signal, obtains difference
The vibration signal that vibration source is produced.
The embodiment of the present invention detected by using fibre optic interferometer to pipe vibration event, obtains the second mixing vibration
Signal sequence, meanwhile, the backward coherent rayleigh for transmitting formation in a fiber according to pulse laser scatters light to pipe vibration event
Detected, obtained the first mixing vibration signal sequence, according to the first mixing vibration signal sequence and the second mixing vibration signal
Sequence, obtains the vibration signal that different vibration sources are produced, and both ensure that the accurate of the vibration event that is produced to different vibration sources during detection
Distinguish, ensure that sample frequency so that safe early warning is more accurate.
Embodiment two
A kind of pipeline safety early warning system is the embodiment of the invention provides, referring to Fig. 2, the system includes：
First laser device 201, for providing first laser；
Fibre optic interferometer 202, for receiving first laser, and produces first to interfere light wave and the second interference light wave；
Photoelectric conversion module 203, for the first interference light wave and the second interference light wave to be converted into the first electric signal and the
Two electric signals；
Along the first optical fiber 204 of pipe laying；
Pulse laser generation device 205, for providing pulse laser；
Coupling module 206, transmits for pulse laser being input into the first optical fiber, and exporting pulse laser in the first optical fiber
When produce backward coherent rayleigh scattering light；
Photodetector 207, for carrying out opto-electronic conversion to coherent rayleigh scattering light, obtains the 3rd electric signal；
Processing module 208, for processing the first electric signal, the second electric signal and the 3rd electric signal, obtains difference
The vibration signal that vibration source is produced.
Specifically, 208 pairs of the 3rd electric signals of processing module are processed, and obtain the first mixing vibration signal sequence；According to
First electric signal and the second electric signal obtain the second mixing vibration signal sequence, further according to the first mixing vibration signal sequence and
Two mixing vibration signal sequences, obtain the vibration signal that different vibration sources are produced.
Specifically, above-mentioned pulse laser generation device 205 can include second laser and acousto-optic modulator.Pulse laser
Generation device 205 can also include pulse laser.Preferably, second laser can be super-narrow line width laser.
Specifically, coupling module 206 can be coupler or circulator.
Further, fibre optic interferometer 202 is Mach-Zehnder optical fiber interferometer, and Mach-Zehnder optical fiber interferometer includes：
First channel join-splitting device 2021 and the second channel join-splitting device 2022, located at the first channel join-splitting device 2021 and the second channel join-splitting device
Between 2022 and along the second optical fiber 2023 of pipe laying, the 3rd optical fiber 2024 and the 4th optical fiber 2025, the first channel join-splitting device
2021 are used to receive first laser, and first laser is divided into two-way, wherein the incidence of the end of the first channel join-splitting device 2021 is led up to,
First is formed in the end multiplex of the second channel join-splitting device 2022 and interfere light wave, the first channel join-splitting device is passed back by the 4th optical fiber 2025, separately
The 4th optical fiber 2025 is led up to transmit to the end of the second channel join-splitting device 2022, it is incident by the end of the second channel join-splitting device 2022, the
The end of one channel join-splitting device 2021 forms second and interferes light wave.
Photoelectric conversion module 203 includes the first photoelectric detective circuit 2031 and the second photoelectric detective circuit 2032, the first light
First interference light wave and the second interference light wave are converted to the by the photoelectric detective circuit 2032 of power detection circuit 2031 and second respectively
One electric signal and the second electric signal.
Preferably, first laser device 201 can be continuous mono-colour laser.
Further, processing module 208 by the first analog-digital converter and the second analog-digital converter respectively with above-mentioned first
Photoelectric detective circuit 2031 is connected with the output end of the second photoelectric detective circuit 2032, and the first analog-digital converter and the second modulus turn
Processing module 208, processing module 208 pairs are arrived in output after above-mentioned first electric signal and the second electric signal are carried out analog-to-digital conversion by parallel operation
First electric signal and the second electric signal carry out delay estimation, so as to be positioned to vibration event, obtain the second mixing vibration letter
Number sequence, as shown in Figure 3.
In addition, processing module 208 is also electrically connected with pulse laser generation device 205, processing module 208 is used to produce sequential
Signal, control pulse laser generation device 205 produces pulse laser.When processing module 208 receives the output of photodetector 207
During three electric signals, the 3rd electric signal is processed, obtain the first mixing vibration signal sequence.Processing module 208 is according to
One mixing vibration signal sequence, determines the number of vibration source and the position of different vibration sources；Wherein, the first mixing vibration signal sequence,
Actually one sequence of phase place change disturbance, according to the intensity of disturbance, determines the vibration source described in different disturbance locations.Root again
Number and the position of different vibration sources according to vibration source, the vibration letter that different vibration sources are produced is divided into by the second mixing vibration signal sequence
Number.When being detected due to carrying out vibration source using backward coherent rayleigh scattering light, in order to not occur between the pulse for ensureing transmission in optical fiber
Interference, it is necessary to ensure in a fiber can only one pulse of phase co-wavelength of simultaneous transmission, therefore, cause which down-sampling frequency
It is relatively low, so the second mixing vibration signal sequence in compared to Fig. 3, in possible first mixing vibration signal sequence, only exists
tn+3And tn+2The pulse at moment, but when being detected due to carrying out vibration source using backward coherent rayleigh scattering light, the high precision of detection, i.e.,
The amplitude of the sign mutation caused by same vibration source in signal is closer, therefore can be according to the first mixing vibration signal sequence
In the strength of turbulence of signal distinguish different vibration sources, so that it is determined that tn+3And tn+2The pulse at moment belongs to different vibration sources, according to
The number of vibration source, and pulse period property rule, the second mixing vibration signal sequence is decomposed into vibration letter as shown in Figure 4
Number sequence.Simultaneously because the sample frequency of the second mixing vibration signal sequence is higher, therefore, while being believed using the first mixing vibration
Number sequence and the second mixing vibration signal sequence carry out vibration source positioning, both ensure that the sample frequency of vibration source detection, ensure again
Accuracy of detection.
Further, the system also includes：
Light polarization modulator 209 and light polarization modulator between the channel join-splitting device 2021 of first laser device 201 and first
The optical fiber 2024 of first phase modulator 211 and the 3rd that the Polarization Controller 210 of 209 electrical connections is connected with the second optical fiber 2023
The second phase modulator 212 of series connection and the phase controller 213 electrically connected with second phase modulator 212, above-mentioned polarization
Controller 210 and phase controller 213 are electrically connected with processing module 208.Above-mentioned Polarization Controller 210 and light polarization modulator
209 constitute polarization decay closed loop circuit so that the phase difference value of the two-way interference light wave that Mach-Zehnder optical fiber interferometer is formed is steady
On phase value required for being scheduled on system.Above-mentioned phase controller 213, first phase modulator 211 and second phase modulator
212 constitute phase fading closed loop circuit so that the two-way that Mach-Zehnder optical fiber interferometer is formed interferes the polarization state difference of light wave
Stabilization is on the angle value required for system.Above-mentioned series winding refers to that first phase modulator is connected in the second optical fiber, now
Second optical fiber includes two sections be connected on first phase modulator.
In another implementation of the embodiment of the present invention, it would however also be possible to employ in the following manner is connected：Second phase is modulated
Device 212 is electrically connected with Polarization Controller 210, and first phase modulator 211 is electrically connected with phase controller 213.
Further, the system also includes：
Erbium-doped fiber amplifier, for carrying out energy amplification to pulse laser, erbium-doped fiber amplifier is located at pulse laser
Between generation device 205 and coupling module 206.
Further, the system should also include the acousto-optic warning unit for carrying out sound and light alarm, and for display tube
The display unit of road vibration position.
The embodiment of the present invention detected by using fibre optic interferometer to pipe vibration event, obtains the second mixing vibration
Signal sequence, meanwhile, the backward coherent rayleigh for transmitting formation in a fiber according to pulse laser scatters light to pipe vibration event
Detected, obtained the first mixing vibration signal sequence, according to the first mixing vibration signal sequence and the second mixing vibration signal
Sequence, obtains the vibration signal that different vibration sources are produced, and both ensure that the accurate of the vibration event that is produced to different vibration sources during detection
Distinguish, ensure that sample frequency so that safe early warning is more accurate.
Embodiment three
A kind of pipe safety prewarning method is the embodiment of the invention provides, referring to Fig. 5, the method includes：
Step 301：First laser is provided.
Step 302：First laser is received using fibre optic interferometer, and produces first to interfere light wave and the second interference light wave.
Fibre optic interferometer can be Mach-Zehnder optical fiber interferometer.
Step 303：First interference light wave and the second interference light wave are converted into the first electric signal and the second electric signal.
Step 304：According to the first electric signal and the second electric signal, the second mixing vibration signal sequence is obtained.
Specifically, can be obtained the second mixing and shaken according to the first electric signal and the second electric signal using Delay Estima-tion technology
Dynamic signal sequence, as shown in figure 3, not repeating here.
Step 305：Pulse laser is input into along the first optical fiber of pipe laying, and exports pulse laser and transmitted in a fiber
The backward coherent rayleigh scattering light for producing.
Pulse laser in step 305, can be produced, it is also possible to directly by pulse by laser and acousto-optic modulation
Laser is produced.
Step 306：Opto-electronic conversion is carried out to coherent rayleigh scattering light, the 3rd electric signal is obtained.
Step 307：3rd electric signal is processed, the first mixing vibration signal sequence is obtained.
Step 308：According to the first mixing vibration signal sequence and the second mixing vibration signal sequence that treatment is obtained, obtain
The vibration signal that different vibration sources are produced.
Specifically, step 308 can be processed using following manner：
Step one, according to the first mixing vibration signal sequence, determine the number of vibration source and the position of different vibration sources.
Wherein, the first mixing vibration signal sequence, actually one sequence of phase place change disturbance, according to the strong of disturbance
Degree, determines the vibration source described in different disturbance locations.
The position of step 2, the number according to vibration source and different vibration sources, difference is divided into by the second mixing vibration signal sequence
The vibration signal that vibration source is produced.
Specifically, when three electric signals is received, the 3rd electric signal is processed, obtains the first mixing vibration signal sequence
Row, when being detected due to carrying out vibration source using backward coherent rayleigh scattering light, in order to not occur between the pulse for ensureing transmission in optical fiber
Interference, it is necessary to ensure in a fiber can only one pulse of phase co-wavelength of simultaneous transmission, therefore, cause which down-sampling frequency
It is relatively low, so the second mixing vibration signal sequence in compared to Fig. 3, in possible first mixing vibration signal sequence, only exists
tn+3And tn+2The pulse at moment, but when being detected due to carrying out vibration source using backward coherent rayleigh scattering light, the high precision of detection, i.e.,
The amplitude of the sign mutation caused by same vibration source in signal is closer, therefore can be according to the first mixing vibration signal sequence
In the strength of turbulence of signal distinguish different vibration sources, so that it is determined that tn+3And tn+2The pulse at moment belongs to different vibration sources, according to
The number of vibration source, and pulse period property rule, the second mixing vibration signal sequence is decomposed into vibration letter as shown in Figure 4
Number sequence.Simultaneously because the sample frequency of the second mixing vibration signal sequence is higher, therefore, while being believed using the first mixing vibration
Number sequence and the second mixing vibration signal sequence carry out vibration source positioning, both ensure that the sample frequency of vibration source detection, ensure again
Accuracy of detection.
The embodiment of the present invention detected by using fibre optic interferometer to pipe vibration event, obtains the second mixing vibration
Signal sequence, meanwhile, the backward coherent rayleigh for transmitting formation in a fiber according to pulse laser scatters light to pipe vibration event
Detected, obtained the first mixing vibration signal sequence, according to the first mixing vibration signal sequence and the second mixing vibration signal
Sequence, obtains the vibration signal that different vibration sources are produced, and both ensure that the accurate of the vibration event that is produced to different vibration sources during detection
Distinguish, ensure that sample frequency so that safe early warning is more accurate.
The embodiments of the present invention are for illustration only, and the quality of embodiment is not represented.
One of ordinary skill in the art will appreciate that realizing that all or part of step of above-described embodiment can be by hardware
To complete, it is also possible to instruct the hardware of correlation to complete by program, described program can be stored in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only storage, disk or CD etc..
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (10)
1. a kind of pipeline safety early warning system, the system includes：
First laser device, for providing first laser；
Fibre optic interferometer, for receiving the first laser, and produces first to interfere light wave and the second interference light wave；
Photoelectric conversion module, for the described first interference light wave and the second interference light wave to be converted into the first electric signal and the
Two electric signals；
Characterized in that, the system also includes：
Along the first optical fiber of pipe laying；
Pulse laser generation device, for providing pulse laser；
Coupling module, for the pulse laser to be input into first optical fiber, and exports the pulse laser described first
The backward coherent rayleigh scattering light produced when being transmitted in optical fiber；
Photodetector, for carrying out opto-electronic conversion to coherent rayleigh scattering light, obtains the 3rd electric signal；
Processing module, for processing the 3rd electric signal, obtains the first mixing vibration signal sequence, and described first mixes
It is a sequence for phase place change disturbance to close vibration signal sequence；According to first electric signal and second electric signal, obtain
To the second mixing vibration signal sequence；According to the intensity that the first mixing vibration signal sequence is disturbed, different disturbing potentials are determined
The vibration source put, obtains the number of vibration source and the position of different vibration sources；The position of number and different vibration sources according to the vibration source, will
The second mixing vibration signal sequence is divided into the vibration signal that different vibration sources are produced.
2. system according to claim 1, it is characterised in that the pulse laser generation device include second laser and
Acousto-optic modulator.
3. system according to claim 1, it is characterised in that the pulse laser generation device includes pulse laser.
4. system according to claim 1, it is characterised in that the coupling module is coupler or circulator.
5. system according to claim 1, it is characterised in that the system also includes：
Erbium-doped fiber amplifier, for carrying out energy amplification to the pulse laser, the erbium-doped fiber amplifier is located at described
Between pulse laser generation device and the coupling module.
6. the system according to claim any one of 1-5, it is characterised in that the fibre optic interferometer is Mach-Zehnder light
Fine interferometer, the Mach-Zehnder optical fiber interferometer includes：
First channel join-splitting device and the second channel join-splitting device, between first channel join-splitting device and second channel join-splitting device and edge
Second optical fiber of pipe laying, the 3rd optical fiber and the 4th optical fiber.
7. system according to claim 6, it is characterised in that the system also includes：
Light polarization modulator between the first laser device and first channel join-splitting device, and located at the Polarization Modulation
Polarization Controller between device and the processing module.
8. system according to claim 7, it is characterised in that the system also includes：
Second phase modulator that the first phase modulator connected with second optical fiber is connected with the 3rd optical fiber and
The phase controller of the processing module connection, the phase controller and the first phase modulator and the second phase
In one in modulator electrical connection, the Polarization Controller and the first phase modulator and the second phase modulator
Another electrical connection.
9. system according to claim 1, it is characterised in that the first laser device is continuous mono-colour laser.
10. a kind of pipe safety prewarning method, it is characterised in that methods described includes：
First laser is provided；
The first laser is received using fibre optic interferometer, and produces first to interfere light wave and the second interference light wave；
Described first interference light wave and the second interference light wave are converted into the first electric signal and the second electric signal；
According to first electric signal and second electric signal, the second mixing vibration signal sequence is obtained；
Pulse laser is input into along the first optical fiber of pipe laying, and exports the pulse laser and generation is transmitted in the optical fiber
Backward coherent rayleigh scattering light；
Opto-electronic conversion is carried out to coherent rayleigh scattering light, the 3rd electric signal is obtained；
3rd electric signal is processed, the first mixing vibration signal sequence, the first mixing vibration signal sequence is obtained
Row are a sequences for phase place change disturbance；
According to the intensity that the first mixing vibration signal sequence is disturbed, the vibration source of different disturbance locations is determined, obtain vibration source
The position of number and different vibration sources；
The position of number and different vibration sources according to the vibration source, different vibration sources are divided into by the second mixing vibration signal sequence
The vibration signal of generation.
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| CN1414283A (en) * | 2002-12-10 | 2003-04-30 | 西安交通大学 | Oil gas pipeline leak intelligent on line monitoring method based on distribution type optical fibre sensor |
| CN1598516A (en) * | 2004-07-19 | 2005-03-23 | 天津大学 | Interference distributed fibre-optical pipe leakage real-time monitoring method and device |
| CN101098195A (en) * | 2006-06-30 | 2008-01-02 | 中国石油天然气集团公司 | Optical fiber safety early-warning system |
| CN101334331A (en) * | 2007-06-27 | 2008-12-31 | 中国石油天然气股份有限公司 | Distributed Optical Fiber Pipeline Safety Early Warning System Based on Phase Interference |
| CN102865914A (en) * | 2012-09-19 | 2013-01-09 | 朱涛 | Distributed optic fiber vibrating sensor |
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2013
- 2013-09-13 CN CN201310418381.0A patent/CN104456086B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1414283A (en) * | 2002-12-10 | 2003-04-30 | 西安交通大学 | Oil gas pipeline leak intelligent on line monitoring method based on distribution type optical fibre sensor |
| CN1598516A (en) * | 2004-07-19 | 2005-03-23 | 天津大学 | Interference distributed fibre-optical pipe leakage real-time monitoring method and device |
| CN101098195A (en) * | 2006-06-30 | 2008-01-02 | 中国石油天然气集团公司 | Optical fiber safety early-warning system |
| CN101334331A (en) * | 2007-06-27 | 2008-12-31 | 中国石油天然气股份有限公司 | Distributed Optical Fiber Pipeline Safety Early Warning System Based on Phase Interference |
| CN102865914A (en) * | 2012-09-19 | 2013-01-09 | 朱涛 | Distributed optic fiber vibrating sensor |
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