CN108254062A - A kind of phase sensitive optical time domain reflection vibration detection device based on chaotic modulation - Google Patents
A kind of phase sensitive optical time domain reflection vibration detection device based on chaotic modulation Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
- G01H9/006—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors the vibrations causing a variation in the relative position of the end of a fibre and another element
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Abstract
A kind of phase sensitive optical time domain reflection vibration detection device based on chaotic modulation of the present invention, belongs to Distributed Optical Fiber Sensing Techniques field；The technical problem to be solved is that provide a kind of phase sensitive optical time domain reflection vibration detection device based on chaotic modulation；Solve technical solution that the technical problem uses for：The present apparatus injects sensor fibre after highly coherent optical signal is carried out chaotic modulation using chaos laser, carries out related operation by the Rayleigh scattering optical signal and reference signal that are generated in sensor fibre to it, obtains the position that vibration occurs；It the composite can be widely applied to long range, high-resolution distributed vibration detection field.
Description
Technical field
A kind of phase sensitive optical time domain reflection vibration detection device based on chaotic modulation of the present invention, belongs to distribution type fiber-optic
Field of sensing technologies.
Background technology
In recent years, the fast development of optical communication technique provides platform for the application of optical fiber sensing technology.With common point
Formula sensor is compared, and distributed fiberoptic sensor has big measurement range, simple in structure, corrosion-resistant, electromagnetism interference, cost performance
The advantages that high, its appearance cause extensive concern.Distributed fiberoptic sensor can be applied to many fields, including it is long away from
From natural gas, petroleum pipeline, submarine pipeline health detection.Wherein, the phase sensitive optical time domain based on backward Rayleigh scattering
Reflectometer（Phase-Sensitive Optical Time-Domain Reflectometer ,-OTDR）With sensitivity
The advantages that height, registration, relatively easy data processing circuit, suitable for the vibration detection of long-distance pipe.1993, the U.S.
The H. F. Taylor of Texas A＆M universities first proposed-OTDR technique.Then, the scholars such as J. C. Juarez use
Homemade optical fiber laser realizes 19 km of orientation range, the intruding detection system of 100 m of positioning accuracy（Applied
optics, 2007, vol. 46, no.11, 1968）；At home, University of Electronic Science and Technology prince south et al. combines Raman amplifiction
Distance sensing is extended to 175 km by technology, and spatial resolution is 25 m（Optics letters, 2014, vol. 39,
no. 20, 5866）.In conclusion in the vibration detection field based on-OTDR, distance sensing is significantly carried
It rises.But it is restricted by pulse width, spatial resolution is still relatively low, usually in the range of tens meters.In general, Fibre Optical Sensor away from
From longer, the detection of optical power needed is bigger, that is, needs to increase pulse width, so causing the reduction of System spatial resolution.
Therefore, in current-OTDR vibration detecting systems, spatial resolution and measurement distance are contradiction.
Invention content
A kind of phase sensitive optical time domain reflection vibration detection device based on chaotic modulation of the present invention, overcomes the prior art
Existing deficiency solves the contradiction between spatial resolution and measurement distance existing for current-OTDR vibration detecting systems.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of phase based on chaotic modulation is quick
Photosensitive Time Domain Reflectometry vibration detection device, including narrow linewidth laser, the first optical modulator, the second optical modulator, fiber amplifier
Device, wave filter, the first fiber coupler, the first photodetector, the first optical circulator, Ramar laser, the second fiber coupling
Device, the first wavelength division multiplexer, the first fiber bragg grating, sensor fibre, the second wavelength division multiplexer, optoisolator, the second light
Fine Bragg grating, the second photodetector, data acquisition device, signal processing apparatus, display device, chaos laser and
Three photodetectors；
Narrow linewidth laser exports highly coherent continuous optical signal and enters the first optical modulator, by continuous optical signal modulation into arteries and veins
Signal is rushed, which enters the second optical modulator, and the chaos optical signal of chaos laser output passes through third photodetection
Enter the second optical modulator after device, chaotic modulation is carried out to entering the pulse signal in the second optical modulator, by chaos tune
Optical signals fiber amplifier after system is amplified using being divided into two-way after entering the first fiber coupler after wave filter, and the
The first via light of one fiber coupler output is used as with reference to light, after the first photodetector with the input of data acquisition device
End is connected；
Second road light of the first fiber coupler output enters the incidence end of the first optical circulator, the reflection end of the first optical circulator
It is connected with the second input terminal of the first wavelength division multiplexer, the optical signal that Ramar laser exports divides after entering the second fiber coupler
For two-way, the first via light of the second fiber coupler output enters the first input end of the first wavelength division multiplexer, and the first wavelength-division is answered
The optical signal exported with device is connected after the first fiber bragg grating with the head end of sensor fibre, and the second fiber coupler is defeated
The the second road light gone out enters the first input end of the second wavelength division multiplexer, and the optical signal of the second wavelength division multiplexer output passes through second
It is connected after fiber bragg grating with the end of sensor fibre, the second input terminal and the optoisolator phase of the second wavelength division multiplexer
Even, the input terminal of the second photodetector is connected with the exit end of the first optical circulator, and the second photodetector is to sensor fibre
In backward Rayleigh scattering optical signal detected, the output terminal of the second photodetector and the input terminal phase of data acquisition device
Even, the output terminal of data acquisition device is connected with signal processing apparatus, and signal processing apparatus carries out collected data related
Operation, the output terminal of signal processing apparatus are connected with the input terminal of display device, the position that the vibration of display device real-time display occurs
It puts.
Further, the chaos laser includes semiconductor laser, Polarization Controller, the second optical circulator, third light
Fine coupler and adjustable optical attenuator, semiconductor laser output optical signal after Polarization Controller with the second optical circulator
Incidence end be connected, the second optical circulator output optical signal be divided into two-way, third optical fiber coupling after third fiber coupler
The first via light of clutch output enters adjustable optical attenuator regulating optical power, the output terminal of adjustable optical attenuator and the second ring of light row
The exit end of device is connected, and the second road light of third fiber coupler output is connected with the input terminal of the third photodetector.
Further, the data acquisition device is analog-to-digital conversion circuit, and the signal processing device is set to fpga chip.
Further, the sensor fibre is G.652 single mode optical fiber.
Compared with prior art, the device have the advantages that being：The present invention, will be highly coherent using chaos laser
Optical signal carry out chaotic modulation after inject sensor fibre, by the Rayleigh scattering optical signal that is generated in sensor fibre to it with
Reference signal carries out related operation and obtains vibration position information, can realize long range, high-precision distributed vibration detection simultaneously,
Have the advantages that at low cost, reliability is high, real-time is good.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
In figure, 1- narrow linewidth lasers, the first optical modulators of 2-, the second optical modulators of 3-, 4- fiber amplifiers, 5- filtering
Device, the first fiber couplers of 6-, the first photodetectors of 7-, the first optical circulators of 8-, 9- Ramar lasers, the second optical fiber of 10-
Coupler, the first wavelength division multiplexers of 11-, the first fiber bragg gratings of 12-, 13- sensor fibres, the second wavelength-division multiplex of 14-
Device, 15- optoisolators, the second fiber bragg gratings of 16-, the second photodetectors of 17-, 18- data acquisition devices, 19- letters
Number processing unit, 20- display devices, 21- chaos lasers, 22- semiconductor lasers, 23- Polarization Controllers, the second light of 24-
Circulator, 25- third fiber couplers, 26- adjustable optical attenuators, 27- third photodetectors.
Specific embodiment
The present invention is described further below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of phase sensitive optical time domain reflection vibration detection device based on chaotic modulation of the present invention, including
Narrow linewidth laser 1, the first optical modulator 2, the second optical modulator 3, fiber amplifier 4, wave filter 5, the first fiber coupler
6th, the first photodetector 7, the first optical circulator 8, Ramar laser 9, the second fiber coupler 10, the first wavelength division multiplexer
11st, the first fiber bragg grating 12, sensor fibre 13, the second wavelength division multiplexer 14, optoisolator 15, the second optical fiber Bragg
Grating 16, the second photodetector 17, data acquisition device 18, signal processing apparatus 19, display device 20, third photodetection
Device 27 and by semiconductor laser 22, Polarization Controller 23, the second optical circulator 24, third fiber coupler 25, tunable optical
The chaos laser 21 that attenuator 26 is formed.
Narrow linewidth laser 1 sends out the highly coherent continuous optical signal of centre wavelength 1550nm, and output terminal is connected to
First optical modulator 2, by continuous optical signal modulation into pulse signal；The output terminal of first optical modulator 2 is connected to the second light tune
The input terminal of device 3 processed；Second optical modulator 3 is modulated by chaos laser 21；Wherein, semiconductor laser 22 is through Polarization Control
Device 23 is connected to the incidence end of the second optical circulator 24；The reflection end of second optical circulator 24 is connected to third fiber coupler
25, it is 20 that optical signal is divided into luminous power accounting by third fiber coupler 25:80 two parts, respectively from two port outputs of a, b；
The a output terminals of third fiber coupler 25 are connected to adjustable optical attenuator 26 and carry out regulating optical power；Adjustable optical attenuator 26 it is defeated
The exit end that outlet is connected to the second optical circulator 24 forms feedback cavity；Polarization Controller 23 is used for adjusting feeding back to semiconductor and swashing
The polarization state of light device 22；The b output terminals of third fiber coupler 25 are the signal output end of chaos laser 21；Third light
The b output terminals of fine coupler 25 are connected to third photodetector 27；The output terminal of third photodetector 27 is connected to second
Optical modulator 3 carries out chaotic modulation to detection light；Later, the detection light through chaotic modulation amplify through fiber amplifier 4, wave filter
After 5 filter out spontaneous emission noise, the first fiber coupler 6 is connected to, optical signal is divided into luminous power by the first fiber coupler 6
Accounting is 1:99 two parts, respectively from two port outputs of c, d；The c output terminals of first fiber coupler 6 are connected to the first photoelectricity
Detector 7, the optical signal of the c output terminals output of the first fiber coupler 6 are used as with reference to signal；The d of first fiber coupler 6 is defeated
Outlet is connected to the incidence end of the first optical circulator 8.
In order to extend distance sensing, the present apparatus employs second order Raman amplifiction structure, i.e. centre wavelength is the drawing of 1366nm
The output terminal of graceful laser 9 is connected to the second fiber coupler 10, and optical signal equal proportion is divided into two parts；Second fiber coupling
The e output terminals of device 10 are connected to the first input end g of the first wavelength division multiplexer 11, the light of input center wavelength 1366nm；First
Second input terminal h of wavelength division multiplexer 11 is connected to the reflection end of the first optical circulator 8, and input center wavelength is 1550nm's
Light；The output terminal of first wavelength division multiplexer 11 is connected to the input terminal of the first fiber bragg grating 12；First optical fiber Bragg
The output terminal of grating 12 is connected to the head end of sensor fibre 13；The f output terminals of second fiber coupler 10 are connected to the second wavelength-division
The first input end j of multiplexer 14, input center wavelength are the light of 1336nm；Second input terminal k of the second wavelength division multiplexer 14
It is connected to optoisolator 15；The output terminal of second wavelength division multiplexer 14 is connected to the input terminal of the second fiber bragg grating 16；
The output terminal of second fiber bragg grating 16 is connected to the end of sensor fibre 13.
Sensor fibre 13 is using common commercial G.652 single mode optical fiber.When 9 output power of Ramar laser is sufficiently large,
Sensor fibre 13, the first fiber bragg grating 12 and the second fiber bragg grating 16 form a diode pumping, right
The light of 1550nm is amplified, therefore can be extended transmission distance.The input terminal of second photodetector 17 and the first ring of light row
The exit end of device 8 is connected, and the second photodetector 17 detects the backward Rayleigh scattering optical signal in sensor fibre 13；The
The output terminal of one photodetector 7 and the second photodetector 17 is connected respectively to data acquisition device by two high frequency cables
18 input terminal；The output terminal of data acquisition device 18 is connected to signal processing apparatus 19, and signal processing apparatus 19 is to collecting
Data carry out related operation；In order to improve arithmetic speed, high speed processing is carried out to signal using FPGA；Finally, signal processing
The output terminal of device 19 is connected to display device 20, the position occurred by the vibration of 20 real-time display of display device.
Although the present invention, those skilled in the art are particularly shown and described with reference to its exemplary embodiment
It should be understood that in the case where not departing from the spirit and scope of the present invention that claim is limited, form can be carried out to it
With the various changes in details.
Claims (4)
1. a kind of phase sensitive optical time domain reflection vibration detection device based on chaotic modulation, it is characterised in that：Including narrow linewidth
Laser（1）, the first optical modulator（2）, the second optical modulator（3）, fiber amplifier（4）, wave filter（5）, the first optical fiber coupling
Clutch（6）, the first photodetector（7）, the first optical circulator（8）, Ramar laser（9）, the second fiber coupler（10）,
One wavelength division multiplexer（11）, the first fiber bragg grating（12）, sensor fibre（13）, the second wavelength division multiplexer（14）, light every
From device（15）, the second fiber bragg grating（16）, the second photodetector（17）, data acquisition device（18）, signal processing
Device（19）, display device（20）, chaos laser（21）With third photodetector（27）；
Narrow linewidth laser（1）Highly coherent continuous optical signal is exported into the first optical modulator（2）, by continuous optical signal tune
Pulse signal is made, which enters the second optical modulator（3）, chaos laser（21）The chaos optical signal of output passes through
Third photodetector（27）Enter the second optical modulator afterwards（3）, to entering the second optical modulator（3）In pulse signal into
Row chaotic modulation, the optical signals fiber amplifier after chaotic modulation（4）It is amplified using wave filter（5）After enter
First fiber coupler（6）After be divided into two-way, the first fiber coupler（6）The first via light of output is used as with reference to light, by the
One photodetector（7）Afterwards with data acquisition device（18）Input terminal be connected；
First fiber coupler（6）Second road light of output enters the first optical circulator（8）Incidence end, the first optical circulator
（8）Reflection end and the first wavelength division multiplexer（11）The second input terminal be connected, Ramar laser（9）The optical signal of output enters
Second fiber coupler（10）After be divided into two-way, the second fiber coupler（10）The first via light of output enters the first wavelength-division multiplex
Device（11）First input end, the first wavelength division multiplexer（11）The optical signal of output passes through the first fiber bragg grating（12）Afterwards
With sensor fibre（13）Head end be connected, the second fiber coupler（10）Second road light of output enters the second wavelength division multiplexer
（14）First input end, the second wavelength division multiplexer（14）The optical signal of output passes through the second fiber bragg grating（16）Afterwards with
Sensor fibre（13）End be connected, the second wavelength division multiplexer（14）The second input terminal and optoisolator（15）It is connected, second
Photodetector（17）Input terminal and the first optical circulator（8）Exit end be connected, the second photodetector（17）To sensing
Optical fiber（13）In backward Rayleigh scattering optical signal detected, the second photodetector（17）The acquisition of output terminal and data fill
It puts（18）Input terminal be connected, data acquisition device（18）Output terminal and signal processing apparatus（19）It is connected, signal processing device
It puts（19）Related operation, signal processing apparatus are carried out to collected data（19）Output terminal and display device（20）Input
End is connected, display device（20）The position that real-time display vibration occurs.
2. a kind of phase sensitive optical time domain reflection vibration detection device based on chaotic modulation according to claim 1,
It is characterized in that:The chaos laser（21）Including semiconductor laser（22）, Polarization Controller（23）, the second optical circulator
（24）, third fiber coupler（25）And adjustable optical attenuator（26）, semiconductor laser（22）The optical signal of output is by inclined
Shake controller（23）Afterwards with the second optical circulator（24）Incidence end be connected, the second optical circulator（24）The optical signal of output passes through
Third fiber coupler（25）After be divided into two-way, third fiber coupler（25）The first via light of output enters adjustable optical attenuator
（26）Regulating optical power, adjustable optical attenuator（26）Output terminal and the second optical circulator（24）Exit end be connected, third light
Fine coupler（25）Second road light of output and the third photodetector（27）Input terminal be connected.
3. a kind of phase sensitive optical time domain reflection vibration detection device based on chaotic modulation according to claim 1 or 2,
It is characterized in that:The data acquisition device（18）For analog-to-digital conversion circuit, the signal processing apparatus（19）For fpga chip.
4. a kind of phase sensitive optical time domain reflection vibration detection device based on chaotic modulation according to claim 1,
It is characterized in that:The sensor fibre（13）For G.652 single mode optical fiber.
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Cited By (6)
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| CN110501062A (en) * | 2019-05-31 | 2019-11-26 | 太原理工大学 | A kind of distribution type fiber-optic sound sensor and positioning system |
| CN111157097A (en) * | 2019-12-31 | 2020-05-15 | 太原理工大学 | Vibration signal detection method based on phase sensitive optical time domain reflection system |
| CN111289222A (en) * | 2020-01-21 | 2020-06-16 | 丽水正阳电力建设有限公司 | Optical fiber breakpoint monitoring device based on phase-sensitive optical time domain reflection technology |
| CN112033521A (en) * | 2020-08-07 | 2020-12-04 | 太原理工大学 | Local noise self-filtering hybrid optical fiber vibration sensing system |
| CN113375903A (en) * | 2021-05-14 | 2021-09-10 | 太原理工大学 | Optical fiber breakpoint positioning device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110136375A (en) * | 2019-05-31 | 2019-08-16 | 太原理工大学 | A kind of distribution type fiber-optic area outlook system |
| CN110501062A (en) * | 2019-05-31 | 2019-11-26 | 太原理工大学 | A kind of distribution type fiber-optic sound sensor and positioning system |
| CN111157097A (en) * | 2019-12-31 | 2020-05-15 | 太原理工大学 | Vibration signal detection method based on phase sensitive optical time domain reflection system |
| CN111157097B (en) * | 2019-12-31 | 2022-07-12 | 太原理工大学 | Vibration signal detection method based on phase-sensitive optical time domain reflection system |
| CN111289222A (en) * | 2020-01-21 | 2020-06-16 | 丽水正阳电力建设有限公司 | Optical fiber breakpoint monitoring device based on phase-sensitive optical time domain reflection technology |
| CN112033521A (en) * | 2020-08-07 | 2020-12-04 | 太原理工大学 | Local noise self-filtering hybrid optical fiber vibration sensing system |
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Application publication date: 20180706 |