CN102359830B - Multiple Raman scattering effect fused ultra remote fiber temperature measurement sensor - Google Patents

Multiple Raman scattering effect fused ultra remote fiber temperature measurement sensor Download PDF

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CN102359830B
CN102359830B CN 201110264324 CN201110264324A CN102359830B CN 102359830 B CN102359830 B CN 102359830B CN 201110264324 CN201110264324 CN 201110264324 CN 201110264324 A CN201110264324 A CN 201110264324A CN 102359830 B CN102359830 B CN 102359830B
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fiber
optical fiber
raman
laser
scattering effect
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CN102359830A (en
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康娟
张在宣
李晨霞
张文平
王剑峰
沈常宇
董新永
金尚忠
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China Jiliang University
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China Jiliang University
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Abstract

The invention discloses a multiple Raman scattering effect fused ultra remote fiber temperature measurement sensor. By utilizing 1660 nm wave band wide spectrum laser generated by a Raman frequency shifter as a light source for system measurement, combined with a Raman amplification effect, and the system light source is amplified to increase a length of a sensing fiber capable of measuring temperature. Anti-Stokes light with temperature information generated in the sensing fiber is amplified by a Raman amplifier of a C wave band, through a coupled narrowband optical filter, Rayleigh scattering light is removed, and the temperature information on the sensing fiber is obtained after demodulation. The invention has the following advantages: after a 1660 nm system light source is subjected to Raman amplification, a temperature measurement length of the sensing fiber is raised, and after anti-Stokes Raman light with the temperature information is moved to a 1550 nm fiber low loss area, combined with the Raman amplifier of a C wave band, a signal to noise ratio of a system is raised. The system is applied to calamity forecasting and monitoring of a petrochemical pipeline, a tunnel and the like of an ultra remote distance of 100 kilometers or more.

Description

The super long distance optical fiber temperature measuring sensor that the graceful scattering effect of Duola merges
Technical field
The invention belongs to distributing optical fiber sensing thermometric field, relate to the super long distance optical fiber temperature measuring sensor that the graceful scattering effect of Duola merges.The applicable long-range 100km of this system and the real-time disaster monitoring occasion of above need.
Technical background
In recent years, utilize optical fibre distribution type sensor realize the temperature at online real-time prediction scene and variation tendency thereof based on simple to operate, can be applicable to the advantages such as rugged surroundings and obtained to pay close attention to widely and study.Such sensor utilizes fiber raman scattering light Strong degree to be subjected to the effect of temperature modulation and the monitoring that the optical time domain reflection principle realizes temperature, can be to petrochemical industry, and traffic bridge, tunnel etc. carry out forecast and the monitoring of safety and Health monitoring and disaster.Zhang Zaixuan proposed " fully distributed fiber Rayleigh and Raman scattering photon strain, temperature sensor " patent of invention in 2009, utilize the strong recently acquisition temperature information of thermally sensitive anti Stokes scattering light intensity and Rayleigh scattering light intensity or Stokes ratio, the method can overcome the measuring error that causes owing to light source fluctuation, but in being only applicable to, short distance 100m-15km on-line temperature monitoring, can not satisfy in recent years petroleum pipe line, transferring electric power cable etc. fully to active demand long-range, very-long-range distributed fiber Raman temperature probe.
The present invention adopt Raman frequency shift device based on stimulated raman scattering testing light source from traditional arrowband 1550nm wave band frequency displacement to wide range 1660nm wave band, when having suppressed coherent noise with in the sensor fibre with the anti Stokes scattering light of temperature information, move on to the 1550nm low-loss band of optical fibers, improved the signal to noise ratio (S/N ratio) of system.The Raman enlarge-effect is fused to wide range 1660nm wave band, makes system testing luminous energy highest-gain reach 17dB, be equal to and improved the about 40km of sensor fibre length.Merged the C-band fiber Raman amplifier, amplified the anti-Stokes Raman light of 1550nm wave band, highest-gain can reach 25dB, has improved system signal noise ratio, has reduced the difficulty that weak signal checks.This temp measuring system possesses the advantages such as far measuring distance, temperature measurement accuracy is high, Demodulation Systems is simple, is applicable to very-long-range 100km fully distributed fiber temperature sensing net, is used for preventing pipeline, the various possible disasters such as tunnel.
Summary of the invention
The purpose of this invention is to provide the super long distance optical fiber temperature measuring sensor that the graceful scattering effect of a kind of Duola merges, can realize the very-long-range 100km distributed optical fiber temperature measurement function that signal to noise ratio (S/N ratio) is good, resolution is high.
Technical solution of the present invention is as follows:
The super long distance optical fiber temperature measuring sensor that the graceful scattering effect of Duola merges comprises fiber pulse laser, optical fiber splitter, the fiber Raman frequency shifter that is formed by single-mode fiber and fiber filter, time delay optical fiber, optical fiber wave multiplexer, optical fibre wavelength division multiplexer, fiber coupler, Raman laser, sensor fibre, two fiber reflection light filters, photoelectricity receiver module, digital signal processor and industrial computer.The input port of optical fiber splitter links to each other with fiber pulse laser, and two output ports link to each other with single-mode fiber, time delay optical fiber respectively; Two input ports of optical fiber wave multiplexer link to each other with time delay optical fiber, fiber filter, and output port links to each other with the input port of optical fibre wavelength division multiplexer; Optical fibre wavelength division multiplexer has three output ports, COM output port and centre wavelength are that the fiber reflection light filter input port of 1450nm links to each other, the 1660nm output port links to each other with an input port of photoelectricity receiver module, and the output port of 1550nm and centre wavelength are that the input port of 1550nm fiber reflection light filter links to each other; Two input ports of fiber coupler and centre wavelength are that fiber reflection light filter, the Raman laser of 1450nm links to each other, and output port links to each other with sensor fibre.
Among the present invention, the centre wavelength of mentioned pulsed laser is 1550nm, and spectral width is 0.2nm, and laser pulse width is that 10-30ns is adjustable, and peak power is that 1-100W is adjustable, and repetition frequency is that 500-800Hz is adjustable; The branching ratio of mentioned optical fiber splitter is 80/20, and the branching ratio of optical fiber wave multiplexer is 60/40; Mentioned fiber Raman frequency shifter is comprised of 800 meters single-mode fibers and fiber filter, and wherein the centre wavelength of light filter is 1660nm, spectral bandwidth 28nm, and transmitance 98% is to the isolation>45dB of 1550nm laser; Mentioned time delay optical fiber length is the general single mode fiber of 805-820 rice; The centre wavelength of mentioned fiber reflection light filter A is 1450nm, and spectral width is 0.5nm, and reflectivity 95% is to the isolation>45dB of 1450nm laser; The centre wavelength of fiber reflection light filter B is 1550nm, and spectral width is 0.5nm, and reflectivity 95% is to the isolation>45dB of 1550nm laser.
Beneficial effect of the present invention is:
The super long distance optical fiber temperature measuring sensor that the graceful scattering effect of Duola of the present invention merges adopts the stimulated Raman scattering principle to realize the raman amplifier effect of Raman frequency shift device, two wave bands, adopts the spontaneous Raman scattering effect to realize the fully distributed fiber thermometric.The raman amplifier of different-waveband plays two effects: the one, amplified the energy of system source, and increased temperature-measuring optical fiber length; The 2nd, amplified the anti-Stokes light intensity, improved system signal noise ratio, reduced the difficulty of Testing of Feeble Signals.Compare with traditional optical fiber temperature measuring sensor, this system's thermometric distance, measuring accuracy height, simple in structure.The present invention is applicable to the occasion that very-long-range needs continuous temperature measurement, prevents pipeline, the various possible disasters such as tunnel.
Description of drawings
Fig. 1 is the super long distance optical fiber temperature measuring sensor structural representation that the graceful scattering effect of Duola merges.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Referring to shown in Figure 1, the super long distance optical fiber temperature measuring sensor that the graceful scattering effect of Duola merges comprises fiber pulse laser 10, optical fiber splitter 11 is by the fiber Raman frequency shifter that single-mode fiber 12 and fiber filter 13 form, time delay optical fiber 14, optical fiber wave multiplexer 15, optical fibre wavelength division multiplexer 16, fiber coupler 17, Raman laser 18, sensor fibre 19, fiber reflection light filter A20, fiber reflection light filter B21, photoelectricity receiver module 22, digital signal processor 23 and industrial computer 24.
The input port of optical fiber splitter 11 links to each other with fiber pulse laser 10, and two output ports link to each other with single-mode fiber 12, time delay optical fiber 14 respectively; Two input ports of optical fiber wave multiplexer 15 link to each other with time delay optical fiber 14, fiber filter 13, and output port links to each other with the input port of optical fibre wavelength division multiplexer 16; Optical fibre wavelength division multiplexer 16 has three output ports, the COM output port links to each other with the input port of fiber reflection light filter A20, the 1660nm output port links to each other with an input port of photoelectricity receiver module 22, and the output port of 1550nm links to each other with the input port of fiber reflection light filter B21; Two input ports of fiber coupler 17 link to each other with fiber reflection light filter A20, Raman laser 18, and output port links to each other with sensor fibre 19.
The centre wavelength of above-mentioned fiber pulse laser is 1550nm, and spectral width is 0.2nm, and laser pulse width is that 10-30ns is adjustable, and peak power is that 1-100W is adjustable, and repetition frequency is that 500-800Hz is adjustable.
The branching ratio of above-mentioned optical fiber splitter is 80/20, and the branching ratio of optical fiber wave multiplexer is 60/40.
Above-mentioned fiber Raman frequency shifter, it is comprised of 800 meters single-mode fibers and fiber filter; Wherein the centre wavelength of light filter is 1660nm, spectral bandwidth 28nm, and transmitance 98% is to the isolation>45dB of 1550nm laser.
Above-mentioned time delay optical fiber length is the general single mode fiber of 805-820 rice.
The centre wavelength of above-mentioned fiber reflection light filter A20 is 1450nm, and spectral width is 0.5nm, and reflectivity 95% is to the isolation>45dB of 1450nm laser; The centre wavelength of fiber reflection light filter B21 is 1550nm, and spectral width is 0.5nm, and reflectivity 95% is to the isolation>45dB of 1550nm laser.
The present invention is based on following three principles:
(1) based on the principle of work of the fiber Raman frequency shifter of stimulated raman scattering
The fiber Raman frequency shifter is comprised of single-mode fiber and broadband 1660nm light filter.When a branch of 1550nm pulse laser incides single-mode fiber, laser and optical fiber molecule generation nonlinear interaction, incident photon is become another Stokes photon or anti-Stokes photon by an optical fiber molecular scattering, emit a phonon and be called Stokes ratio, in sensor fibre, produced the 1660nm stokes light of frequency displacement 13.2THz, after the 1550nm of incident laser power reached certain threshold value, most of incident light was converted into stokes light (excited state).When another bundle 1550nm laser and 1660nm Stokes Raman light of being told by the incident laser source incide same sensor fibre, two-beam produces nonlinear interaction at the place of meeting, produce the stokes light (enlargement factor is relevant with the ratio of two-beam power) that amplifies, obtained to merge the wide range 1660nm wave band of laser of Raman enlarge-effect, as the system testing light source, highest-gain can reach 17dB, is equivalent to prolong temperature-measuring optical fiber length 40km.
(2) distributed optical fiber Raman amplifier principle of work
For fiber Raman amplifier, when pump power only has a certain threshold value of surpassing, just might produce excited Raman to signal amplifies, stokes wave in the optical fiber is increased in fiber medium fast, the power of most of pump light can convert stokes light to, possess Raman amplification, the turn off gain of its amplification is
G A=exp(g RP 0L eff/A eff) (1)
P wherein 0=I 0A EffThe pump light power input of amplifier, g RRaman gain coefficienct A EffThe free area of optical fiber, L EffEffective interaction length (having considered the absorption loss of optical fiber to pumping) for optical fiber.
Gain can suppress the loss of optical fiber, improves the signal to noise ratio (S/N ratio) of system, reduces the difficulty of weak signal check system.
(3) based on the fully distributed fiber temperature probe principle of spontaneous Raman scattering effect
When incident laser and optical fiber molecule generation nonlinear interaction, emit a phonon and be called the Stokes Raman scattering photon, absorb a phonon and be called the anti-Stokes Raman scattering photon.Boltzmann's law is obeyed in population heat distribution on the optical fiber molecular entergy level, and dorsad Raman scattering light intensity of anti-Stokes is in optical fiber
I a=I 0·v a 4R a(T)exp[-(α 0a)·L] (2)
It is subject to the modulation of fiber optic temperature, temperature modulation function R a
R a(T)=[exp(hΔv/kT)-1] -1 (3)
H is the Bo Langke constant, and Δ v is the Phonon frequency of an optical fiber molecule, is 13.2THz, and k is Boltzmann constant, and T is Kai Erwen absolute temperature.
Adopt in the present invention the fiber Rayleigh passage to make reference signal, come detected temperatures with the ratio of the sharp light intensity of anti-Stokes Raman diffused light and auspicious scattered light
I a ( T ) I R ( T ) = ( v t v 0 ) 4 · exp [ ( hΔv / kT ) - 1 ] - 1 · exp [ - ( α a - α 0 ) · L ] - - - ( 4 )
By anti-Stokes Raman diffused light and the auspicious scattered light sharp light strength ratio of fiber Raman optical time domain reflection (OTDR) curve at the optical fiber check point, obtain the temperature information of each section of optical fiber.

Claims (6)

1. the super long distance optical fiber temperature measuring sensor that merges of the graceful scattering effect of Duola, it is characterized in that comprising fiber pulse laser (10), optical fiber splitter (11), the fiber Raman frequency shifter that is formed by single-mode fiber (12) and fiber filter (13), time delay optical fiber (14), optical fiber wave multiplexer (15), optical fibre wavelength division multiplexer (16), fiber coupler (17), Raman laser (18), sensor fibre (19), fiber reflection light filter A (20), fiber reflection light filter B (21), photoelectricity receiver module (22), digital signal processor (23) and industrial computer (24); The input port of optical fiber splitter (11) links to each other with fiber pulse laser (10), and two output ports link to each other with single-mode fiber (12), time delay optical fiber (14) respectively; Two input ports of optical fiber wave multiplexer (15) link to each other with time delay optical fiber (14), fiber filter (13), and output port links to each other with the input port of optical fibre wavelength division multiplexer (16); Optical fibre wavelength division multiplexer (16) has three output ports, the COM output port links to each other with the input port of fiber reflection light filter A (20), the 1660nm output port links to each other with an input port of photoelectricity receiver module (22), and the output port of 1550nm links to each other with the input port of fiber reflection light filter B (21); Two input ports of fiber coupler (17) link to each other with fiber reflection light filter A (20), Raman laser (18), and output port links to each other with sensor fibre (19).
2. the super long distance optical fiber temperature measuring sensor that merges of the graceful scattering effect of Duola according to claim 1, the centre wavelength that it is characterized in that fiber pulse laser (10) is 1550nm, spectral width is 0.2nm, laser pulse width is that 10-30ns is adjustable, peak power is that 1-100W is adjustable, and repetition frequency is that 500-800Hz is adjustable.
3. the super long distance optical fiber temperature measuring sensor that merges of the graceful scattering effect of Duola according to claim 1, the branching ratio that it is characterized in that optical fiber splitter (11) is 80/20, the branching ratio of optical fiber wave multiplexer (15) is 60/40.
4. the super long distance optical fiber temperature measuring sensor that merges of the graceful scattering effect of Duola according to claim 1, it is characterized in that the fiber Raman frequency shifter is comprised of 800 meters single-mode fiber (12) and fiber filter (13), the centre wavelength of fiber filter is 1660nm, spectral bandwidth 28nm, transmitance 98% is to the isolation>45dB of 1550nm laser.
5. the super long distance optical fiber temperature measuring sensor of the graceful scattering effect fusion of Duola according to claim 1 is characterized in that time delay optical fiber (14) is that length is the general single mode fiber of 805-820 rice.
6. the super long distance optical fiber temperature measuring sensor that merges of the graceful scattering effect of Duola according to claim 1, the centre wavelength that it is characterized in that fiber reflection light filter A (20) is 1450nm, spectral width is 0.5nm, and reflectivity 95% is to the isolation>45dB of 1450nm laser; The centre wavelength of fiber reflection light filter B (21) is 1550nm, and spectral width is 0.5nm, and reflectivity 95% is to the isolation>45dB of 1550nm laser.
CN 201110264324 2011-09-06 2011-09-06 Multiple Raman scattering effect fused ultra remote fiber temperature measurement sensor Expired - Fee Related CN102359830B (en)

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CN105067146B (en) * 2015-03-20 2019-09-03 深圳市迅捷光通科技有限公司 Stimulated Raman scattering inhibits apparatus and method and distributed optical fiber sensing system
CN106230960A (en) * 2016-08-10 2016-12-14 合肥国盛电池科技有限公司 Lithium battery group long-distance monitorng device
CN106645082B (en) * 2016-11-03 2020-12-11 北京信息科技大学 Gated fiber Raman spectrometer based on automatic focusing of laser ranging
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