CN103913186A - Multiparameter distributed type optical fiber sensing system based on Rayleigh scattering and Raman scattering - Google Patents

Multiparameter distributed type optical fiber sensing system based on Rayleigh scattering and Raman scattering Download PDF

Info

Publication number
CN103913186A
CN103913186A CN201410168218.8A CN201410168218A CN103913186A CN 103913186 A CN103913186 A CN 103913186A CN 201410168218 A CN201410168218 A CN 201410168218A CN 103913186 A CN103913186 A CN 103913186A
Authority
CN
China
Prior art keywords
optical fiber
connected
division multiplexer
raman
wavelength division
Prior art date
Application number
CN201410168218.8A
Other languages
Chinese (zh)
Inventor
朱涛
周进
何茜
Original Assignee
重庆大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 重庆大学 filed Critical 重庆大学
Priority to CN201410168218.8A priority Critical patent/CN103913186A/en
Publication of CN103913186A publication Critical patent/CN103913186A/en

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01HMEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H9/00Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
    • G01H9/004Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors

Abstract

The invention relates to a multiparameter distributed type optical fiber sensing system based on Rayleigh scattering and Raman scattering. According to the structure of the optical fiber sensing system, the output end of a light source providing device is connected with an input end light path of a three-port circulator; the output end of the three-port circulator is connected with a first common end of a Raman wavelength division multiplexer, and the transmit-receive multiplexing end of the three-port circulator is connected with a first photoelectric detector; a second common end and a third common end of the Raman wavelength division multiplexer are connected to a second photoelectric detector, and a fourth common end of the Raman wavelength division multiplexer is connected with one ends of long-distance sensing optical fibers; the output ends of the first photoelectric detector and the second photoelectric detector are connected to a data acquisition card; the long-distance sensing optical fibers are laid in a space to be detected. The multiparameter distributed type optical fiber sensing system has the advantages that temperature and vibration information in a monitored environment can be monitored at the same time, system constructing cost is reduced substantially, and the comprehensive utilization of the that temperature and vibration information by the system is facilitated.

Description

Multiparameter distributed optical fiber sensing system based on Rayleigh scattering and Raman scattering

Technical field

The present invention relates to a kind of optical fiber sensing technology, relate in particular to a kind of multiparameter distributed optical fiber sensing system based on Rayleigh scattering and Raman scattering.

Background technology

Along with the progress of technology, the technology of carrying out temperature, vibration monitoring with long-distance sensing optical fiber has reached its maturity, but in prior art, temperature monitoring and vibration monitoring need to adopt two to overlap independently monitoring system, from the overall situation, the monitoring mode of prior art not only cost is higher, and data sharing between monitoring system is also a large problem; If temperature monitoring and vibration monitoring can be united two into one, not only can significantly reduce system building cost (especially can reduce the consumption of long-distance sensing optical fiber and lay accordingly cost), and can make temperature monitoring data and the real-time intercommunication of vibration monitoring data, late time data is processed more convenient, efficient, be conducive to the comprehensive utilization of system to data, the accuracy of raising location and ageing.

Summary of the invention

For the problem in background technology, the present invention proposes a kind of multiparameter distributed optical fiber sensing system based on Rayleigh scattering and Raman scattering, its structure is: described multiparameter distributed optical fiber sensing system is made up of light source-providing device, three port circulators, Raman wavelength division multiplexer, the first photodetector, the second photodetector, data collecting card and long-distance sensing optical fiber; The output terminal of described light source-providing device is connected with the input end light path of three port circulators; The output terminal of three port circulators is connected with the first common port of Raman wavelength division multiplexer, and the multiplexing end of transmitting-receiving of three port circulators is connected with the first photodetector; The second common port of Raman wavelength division multiplexer and the 3rd common port are all connected to the second photodetector, and the 4th common port of Raman wavelength division multiplexer is connected with one end of long-distance sensing optical fiber; The output terminal of the first photodetector and the second photodetector is all connected to data collecting card; Long-distance sensing optical fiber is laid in space to be measured.

Principle of the present invention is: the detection light of light source-providing device output injects in long-distance sensing optical fiber after by three port circulators and Raman wavelength division multiplexer, and after inspiring respectively in long-distance sensing optical fiber to Rayleigh scattering light and backward Raman scattering light, wherein, backward Rayleigh scattering light is back in three port circulators and from the multiplexing end of transmitting-receiving of three port circulators and is entered the first photodetector by the first common port, simultaneously, stokes light in backward Raman scattering light and anti-Stokes light enter in the second photodetector by the second common port and the 3rd common port respectively, for temperature monitoring: in the time that the variation of ambient temperature acts on long-distance sensing optical fiber, will cause that the Raman scattering light intensity within the scope of light impulse length changes, and then cause the light intensity of the anti-Stokes light in Raman scattering to change, now just can be using stokes light as recall the temperature information carrying in anti-Stokes light with reference to photodissociation, the signal that multiple sampling periods are collected carries out progressive mean and processes the positional information that just can draw temperature variation, for vibration monitoring: in the time that extraneous vibration acts on long-distance sensing optical fiber, will cause that within the scope of light impulse length, the phase place of backward Rayleigh scattering light changes, and then cause the light intensity of backward Rayleigh scattering light also to change, a large amount of signals that multiple sampling periods are collected carry out moving average processing, can draw the positional information of vibration, the time-domain signal that takes out vibration position, does Nonuniform fast Fourier transform to it, just can draw the frequency information of vibration.Wherein, four common ports of Raman wavelength division multiplexer can be by selecting different operating wavelength to realize the gating to Raman diffused light and Rayleigh scattering light, the basic skills that this should grasp for those skilled in the art.

Innovative point of the present invention is: the vibration measurement technique based on backward Rayleigh scattering principle and the temperature measurement technology based on backward Raman scattering principle are the common technique in sensory field of optic fibre, innovative point of the present invention does not lie in measuring principle itself, core innovative point of the present invention is the monitoring system based on two kinds of measuring principles to unite two into one, on-line monitoring when realizing temperature and two kinds of parameters of vibration by a set of monitoring system, reduce greatly the consumption of long-distance sensing optical fiber and laid accordingly cost, even if occur that at same position place temperature variation and vibration change simultaneously, because monitoring system of the present invention is the measuring principle different based on two kinds to the measurement of temperature and vibration, between two kinds of Monitoring Data, there is not the problem of phase mutual interference.

Preferably, described light source-providing device is made up of light source, Polarization Controller, acousto-optic modulator, er-doped amplifying fiber and optical filter; Light source, Polarization Controller, acousto-optic modulator, er-doped amplifying fiber are connected in turn with optical filter; Wherein, the output terminal of optical filter is connected with the input end light path of three port circulators.Light source adopts laser instrument, and the light of laser instrument output is modulated to pulsed light after Polarization Controller and acousto-optic modulator processing, then after the amplification of er-doped amplifying fiber and optical filter de-noising, exports three port circulators to.

Preferably, described acousto-optic modulator is all connected with a function generator with data collecting card, and function generator is for controlling the action of acousto-optic modulator and data collecting card.

Preferably, the other end of described long-distance sensing optical fiber is provided with a wavelength division multiplexer, and described wavelength division multiplexer is connected with a pump light source; Wavelength division multiplexer is for the output light of pump light source is imported to long-distance sensing optical fiber, and the light of pump light source output amplifies for the backward Rayleigh scattering light that long-distance sensing optical fiber is produced.

Preferably, the operation wavelength of described the first common port and the centre wavelength of backward Rayleigh scattering light are mated (being generally 1550nm); The operation wavelength of the second common port and the 3rd common port is mated with the centre wavelength of stokes light (being generally 1660nm) and anti-Stokes light (being generally 1450nm) respectively.

Useful technique effect of the present invention is: can monitor the temperature in monitoring of environmental and vibration information, system building cost significantly reduces simultaneously, and the system of being convenient to fully utilizes temperature and vibration information.

Brief description of the drawings

Fig. 1, principle schematic of the present invention;

Fig. 2, a kind of embodiment schematic diagram of the present invention;

In figure, the corresponding title of each mark is respectively: light source-providing device 1, light source 1-1, Polarization Controller 1-2, acousto-optic modulator 1-3, er-doped amplifying fiber 1-4, optical filter 1-5, three port circulators 2, Raman wavelength division multiplexer 3, the first photodetector 4, the second photodetector 5, data collecting card 6, long-distance sensing optical fiber 7, wavelength division multiplexer 9, pump light source 10.

Embodiment

A multiparameter distributed optical fiber sensing system based on Rayleigh scattering and Raman scattering, described multiparameter distributed optical fiber sensing system is made up of light source-providing device 1, three port circulators 2, Raman wavelength division multiplexer 3, the first photodetector 4, the second photodetector 5, data collecting card 6 and long-distance sensing optical fiber 7;

The output terminal of described light source-providing device 1 is connected with the input end light path of three port circulators 2; The output terminal of three port circulators 2 is connected with the first common port 3-1 of Raman wavelength division multiplexer 3, and the multiplexing end of transmitting-receiving of three port circulators 2 is connected with the first photodetector 4; The second common port 3-2 and the 3rd common port 3-3 of Raman wavelength division multiplexer 3 are connected to the second photodetector 5, and the 4th common port of Raman wavelength division multiplexer 3 is connected with one end of long-distance sensing optical fiber 7; The output terminal of the first photodetector 4 and the second photodetector 5 is all connected to data collecting card 6; Long-distance sensing optical fiber 7 is laid in space to be measured.

Further, described light source-providing device 1 is made up of light source 1-1, Polarization Controller 1-2, acousto-optic modulator 1-3, er-doped amplifying fiber 1-4 and optical filter 1-5; Light source 1-1, Polarization Controller 1-2, acousto-optic modulator 1-3, er-doped amplifying fiber 1-4 are connected in turn with optical filter 1-5; Wherein, the output terminal of optical filter 1-5 is connected with the input end light path of three port circulators 2.

Further, described acousto-optic modulator 1-3 is connected with a function generator 8 with data collecting card 6, and function generator 8 is for controlling the action of acousto-optic modulator 1-3 and data collecting card 6.

Further, the other end of described long-distance sensing optical fiber 7 is provided with a wavelength division multiplexer 9, and described wavelength division multiplexer 9 is connected with a pump light source 10; Wavelength division multiplexer 9 is for the output light of pump light source 10 is imported to long-distance sensing optical fiber 7, and the light that pump light source 10 is exported amplifies for the backward Rayleigh scattering light that long-distance sensing optical fiber 7 is produced.

Further, described the first operation wavelength of common port 3-1 and the centre wavelength of backward Rayleigh scattering light are mated; The operation wavelength of the second common port 3-2 and the 3rd common port 3-3 is mated with the centre wavelength of stokes light and anti-Stokes light respectively.

Claims (5)

1. the multiparameter distributed optical fiber sensing system based on Rayleigh scattering and Raman scattering, is characterized in that: described multiparameter distributed optical fiber sensing system is made up of light source-providing device (1), three port circulators (2), Raman wavelength division multiplexer (3), the first photodetector (4), the second photodetector (5), data collecting card (6) and long-distance sensing optical fiber (7);
The output terminal of described light source-providing device (1) is connected with the input end light path of three port circulators (2); The output terminal of three port circulators (2) is connected with first common port (3-1) of Raman wavelength division multiplexer (3), and the multiplexing end of transmitting-receiving of three port circulators (2) is connected with the first photodetector (4); Second common port (3-2) of Raman wavelength division multiplexer (3) and the 3rd common port (3-3) are all connected to the second photodetector (5), and the 4th common port of Raman wavelength division multiplexer (3) is connected with one end of long-distance sensing optical fiber (7); The output terminal of the first photodetector (4) and the second photodetector (5) is all connected to data collecting card (6); Long-distance sensing optical fiber (7) is laid in space to be measured.
2. the multiparameter distributed optical fiber sensing system based on Rayleigh scattering and Raman scattering according to claim 1, is characterized in that: described light source-providing device (1) is made up of light source (1-1), Polarization Controller (1-2), acousto-optic modulator (1-3), er-doped amplifying fiber (1-4) and optical filter (1-5); Light source (1-1), Polarization Controller (1-2), acousto-optic modulator (1-3), er-doped amplifying fiber (1-4) and optical filter (1-5) five are connected in turn; Wherein, the output terminal of optical filter (1-5) is connected with the input end light path of three port circulators (2).
3. the multiparameter distributed optical fiber sensing system based on Rayleigh scattering and Raman scattering according to claim 2, it is characterized in that: described acousto-optic modulator (1-3) is all connected with a function generator (8) with data collecting card (6), function generator (8) is for controlling the action of acousto-optic modulator (1-3) and data collecting card (6).
4. the multiparameter distributed optical fiber sensing system based on Rayleigh scattering and Raman scattering according to claim 1, it is characterized in that: the other end of described long-distance sensing optical fiber (7) is provided with a wavelength division multiplexer (9), described wavelength division multiplexer (9) is connected with a pump light source (10); Wavelength division multiplexer (9) is for the output light of pump light source (10) is imported to long-distance sensing optical fiber (7), and the light of pump light source (10) output amplifies for the backward Rayleigh scattering light that long-distance sensing optical fiber (7) is produced.
5. the multiparameter distributed optical fiber sensing system based on Rayleigh scattering and Raman scattering according to claim 1, is characterized in that: the operation wavelength of described the first common port (3-1) is mated with the centre wavelength of backward Rayleigh scattering light; The operation wavelength of the second common port (3-2) and the 3rd common port (3-3) is mated with the centre wavelength of stokes light and anti-Stokes light respectively.
CN201410168218.8A 2014-04-25 2014-04-25 Multiparameter distributed type optical fiber sensing system based on Rayleigh scattering and Raman scattering CN103913186A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410168218.8A CN103913186A (en) 2014-04-25 2014-04-25 Multiparameter distributed type optical fiber sensing system based on Rayleigh scattering and Raman scattering

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410168218.8A CN103913186A (en) 2014-04-25 2014-04-25 Multiparameter distributed type optical fiber sensing system based on Rayleigh scattering and Raman scattering

Publications (1)

Publication Number Publication Date
CN103913186A true CN103913186A (en) 2014-07-09

Family

ID=51039049

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410168218.8A CN103913186A (en) 2014-04-25 2014-04-25 Multiparameter distributed type optical fiber sensing system based on Rayleigh scattering and Raman scattering

Country Status (1)

Country Link
CN (1) CN103913186A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104792342A (en) * 2015-04-17 2015-07-22 安徽师范大学 Distributed optical fiber sensing device with two parameter measuring functions
CN105067041A (en) * 2015-08-19 2015-11-18 华东交通大学 Overhead line state monitoring device and control method therefor
CN105509869A (en) * 2016-02-04 2016-04-20 安徽师范大学 Distributed optical fiber vibration sensing device utilizing stimulated raman scattering and operation method thereof
CN105547459A (en) * 2016-01-18 2016-05-04 重庆大学 Sampling control method for distributed-type fiber vibration sensing system
CN108459011A (en) * 2018-07-12 2018-08-28 吉林大学 A kind of gas molar fraction measurement method based on LR laser raman and Rayleigh scattering
CN108534910A (en) * 2018-03-19 2018-09-14 浙江师范大学 A kind of distributed dual sampling method based on Asymmetric Twin-Core Fiber

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5765948A (en) * 1995-03-07 1998-06-16 Kabushiki Kaisha Toshiba Light-temperature distribution sensor using back scattering light produced by incident light pulse and temperature distribution measuring method
CN2896250Y (en) * 2006-05-15 2007-05-02 四川莱威科技有限公司 Distribution-type optical-fiber temperature sensor
CN101592475A (en) * 2009-06-08 2009-12-02 中国计量学院 Fully distributed fiber Rayleigh and Raman scattering photon strain, temperature sensor
CN102072741A (en) * 2010-10-29 2011-05-25 上海华魏光纤传感技术有限公司 Ultra-long distance distribution type optical fiber sensor and using method thereof
CN102226703A (en) * 2011-03-29 2011-10-26 宁波诺驰光电科技发展有限公司 Distributed fiber multi-parameter sensor and multi-parameter measuring method
CN102589620A (en) * 2012-03-07 2012-07-18 杭州安远科技有限公司 Distributed-type optical fiber sensing device and method for simultaneously measuring vibration and temperature
CN103727968A (en) * 2013-12-31 2014-04-16 宁波诺驰光电科技发展有限公司 Distributed type optical fiber sensing device and method for simultaneously measuring temperature, strain and vibration

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5765948A (en) * 1995-03-07 1998-06-16 Kabushiki Kaisha Toshiba Light-temperature distribution sensor using back scattering light produced by incident light pulse and temperature distribution measuring method
CN2896250Y (en) * 2006-05-15 2007-05-02 四川莱威科技有限公司 Distribution-type optical-fiber temperature sensor
CN101592475A (en) * 2009-06-08 2009-12-02 中国计量学院 Fully distributed fiber Rayleigh and Raman scattering photon strain, temperature sensor
CN102072741A (en) * 2010-10-29 2011-05-25 上海华魏光纤传感技术有限公司 Ultra-long distance distribution type optical fiber sensor and using method thereof
CN102226703A (en) * 2011-03-29 2011-10-26 宁波诺驰光电科技发展有限公司 Distributed fiber multi-parameter sensor and multi-parameter measuring method
CN102589620A (en) * 2012-03-07 2012-07-18 杭州安远科技有限公司 Distributed-type optical fiber sensing device and method for simultaneously measuring vibration and temperature
CN103727968A (en) * 2013-12-31 2014-04-16 宁波诺驰光电科技发展有限公司 Distributed type optical fiber sensing device and method for simultaneously measuring temperature, strain and vibration

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104792342A (en) * 2015-04-17 2015-07-22 安徽师范大学 Distributed optical fiber sensing device with two parameter measuring functions
CN105067041A (en) * 2015-08-19 2015-11-18 华东交通大学 Overhead line state monitoring device and control method therefor
CN105547459A (en) * 2016-01-18 2016-05-04 重庆大学 Sampling control method for distributed-type fiber vibration sensing system
CN105509869A (en) * 2016-02-04 2016-04-20 安徽师范大学 Distributed optical fiber vibration sensing device utilizing stimulated raman scattering and operation method thereof
CN105509869B (en) * 2016-02-04 2019-11-26 安徽师范大学 A kind of distributed optical fiber vibration sensing device and its operating method using stimulated Raman scattering
CN108534910A (en) * 2018-03-19 2018-09-14 浙江师范大学 A kind of distributed dual sampling method based on Asymmetric Twin-Core Fiber
CN108459011A (en) * 2018-07-12 2018-08-28 吉林大学 A kind of gas molar fraction measurement method based on LR laser raman and Rayleigh scattering

Similar Documents

Publication Publication Date Title
Peled et al. Monitoring the propagation of mechanical waves using an optical fiber distributed and dynamic strain sensor based on BOTDA
CN100504309C (en) Brillouin optical time domain reflection measuring method based on quick fourier transform
CN102706437B (en) Super-long distance phase-sensitive optical time domain reflectometer (Phi-OTDR) system
CN101813497B (en) Brillouin scattering spectrum real-time spectrum analyzing device and data processing method thereof
CN105067103B (en) Vibration detection device and its method based on optical frequency domain reflectometer
CN102168808B (en) Distributed optical fiber vibration sensor
WO2012094086A3 (en) Method and apparatus for monitoring vibration using fiber optic sensors
CN102636217B (en) Sensing device based on joint detection of Brillouin optical time domain analysis and Mach-Zehnder interference
CN101629855B (en) Distributed optical fiber sensing system and detection method utilizing same
CN102759371A (en) COTDR (coherent detection based optical time-domain reflectometry) fused long-distance coherent detection brilouin optical time-domain analyzer
WO2010136809A3 (en) Optical sensor and method of use
CN101603856B (en) Long-distance distributed optical fiber vibration sensing system and method thereof
CN102168953A (en) Full-distributed optical fiber strain and vibration sensor based on coherent heterodyne detection
Sun et al. Distributed fiber-optic vibration sensor using a ring Mach-Zehnder interferometer
CN103308146B (en) The signal demodulating system of Optic Fibre F-P Acoustic Emission Sensor
CN102901525B (en) Ultra-large capacity time division and wavelength division fiber grating sensing system and query method thereof
CN104677396B (en) Dynamic distributed Brillouin optical fiber sensing device and method
CN102147236A (en) Fully distributed optical fiber strain and vibration sensing method and sensor
CN102607621A (en) Distributed optical fiber Brillouin sensing device and method thereof for detecting temperature and strain synchronously
CN101603866B (en) Distributed optical fiber stress temperature sensing device and sensing method thereof
CN105136177B (en) The distribution type optical fiber sensing equipment and method of a kind of submillimeter spatial resolution
CN106907997B (en) A kind of displacement measurement signal analysis method based on optic fiber displacement sensor system
CN103245369B (en) Novel fiber bragg grating demodulation method and system thereof based on multi-longitudinal mode F-P laser device
CN102538985B (en) Sensing signal detecting device and method based on fiber Brillouin ring laser
CN102680581B (en) Matched-type fiber-grating acoustic emission sensing method with temperature compensation

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20140709