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 PDFInfo
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- 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
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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
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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
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.
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| 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 |
| WO2020159944A1 (en) * | 2019-01-30 | 2020-08-06 | Saudi Arabian Oil Company | Hybrid distributed acoustic testing |
| CN112038878A (en) * | 2020-09-22 | 2020-12-04 | 上海波汇科技有限公司 | Distributed optical fiber acoustic wave sensing system based on far pump amplifier and Raman amplifier |
| CN113167604A (en) * | 2018-11-30 | 2021-07-23 | 日本电气株式会社 | Optical fiber sensing expansion device and optical fiber sensing system |
| CN113654580A (en) * | 2021-07-30 | 2021-11-16 | 太原理工大学 | Optical frequency domain reflection system capable of simultaneously measuring temperature and strain |
| CN113916498A (en) * | 2021-09-30 | 2022-01-11 | 电子科技大学中山学院 | Wavelength division multiplexing incoherent optical frequency domain reflected optical fiber quality detection device and method |
| CN114136554A (en) * | 2020-09-04 | 2022-03-04 | 中国石油天然气股份有限公司 | Pipeline oil gas leakage monitoring device and method |
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| 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 |
| CN113167604A (en) * | 2018-11-30 | 2021-07-23 | 日本电气株式会社 | Optical fiber sensing expansion device and optical fiber sensing system |
| CN113167604B (en) * | 2018-11-30 | 2023-11-28 | 日本电气株式会社 | Optical fiber sensing expansion device and optical fiber sensing system |
| CN114026393A (en) * | 2019-01-30 | 2022-02-08 | 沙特阿拉伯石油公司 | Hybrid distributed acoustic testing |
| WO2020159944A1 (en) * | 2019-01-30 | 2020-08-06 | Saudi Arabian Oil Company | Hybrid distributed acoustic testing |
| US11209307B2 (en) | 2019-01-30 | 2021-12-28 | Saudi Arabian Oil Company | Hybrid distributed acoustic testing |
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| CN112038878A (en) * | 2020-09-22 | 2020-12-04 | 上海波汇科技有限公司 | Distributed optical fiber acoustic wave sensing system based on far pump amplifier and Raman amplifier |
| CN112038878B (en) * | 2020-09-22 | 2021-09-07 | 上海波汇科技有限公司 | Distributed optical fiber acoustic wave sensing system based on far pump amplifier and Raman amplifier |
| US11530597B2 (en) | 2021-02-18 | 2022-12-20 | Saudi Arabian Oil Company | Downhole wireless communication |
| US11603756B2 (en) | 2021-03-03 | 2023-03-14 | Saudi Arabian Oil Company | Downhole wireless communication |
| US11644351B2 (en) | 2021-03-19 | 2023-05-09 | Saudi Arabian Oil Company | Multiphase flow and salinity meter with dual opposite handed helical resonators |
| US11619114B2 (en) | 2021-04-15 | 2023-04-04 | Saudi Arabian Oil Company | Entering a lateral branch of a wellbore with an assembly |
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| CN113654580B (en) * | 2021-07-30 | 2023-06-13 | 太原理工大学 | Optical frequency domain reflection system for simultaneously measuring temperature and strain |
| CN113654580A (en) * | 2021-07-30 | 2021-11-16 | 太原理工大学 | Optical frequency domain reflection system capable of simultaneously measuring temperature and strain |
| CN113916498A (en) * | 2021-09-30 | 2022-01-11 | 电子科技大学中山学院 | Wavelength division multiplexing incoherent optical frequency domain reflected optical fiber quality detection device and method |
| US11994016B2 (en) | 2021-12-09 | 2024-05-28 | Saudi Arabian Oil Company | Downhole phase separation in deviated wells |
| CN115789531A (en) * | 2022-11-07 | 2023-03-14 | 吉林大学 | Submarine pipeline leakage monitoring system and method |
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Application publication date: 20140709 |