CN105136178B - The distribution type optical fiber sensing equipment and method of the relevant domain analysis of chaos Brillouin light - Google Patents

The distribution type optical fiber sensing equipment and method of the relevant domain analysis of chaos Brillouin light Download PDF

Info

Publication number
CN105136178B
CN105136178B CN201510531253.6A CN201510531253A CN105136178B CN 105136178 B CN105136178 B CN 105136178B CN 201510531253 A CN201510531253 A CN 201510531253A CN 105136178 B CN105136178 B CN 105136178B
Authority
CN
China
Prior art keywords
signal
optical
light
connection
optical fiber
Prior art date
Application number
CN201510531253.6A
Other languages
Chinese (zh)
Other versions
CN105136178A (en
Inventor
张建忠
张明江
刘毅
王云才
张明涛
冯昌坤
Original Assignee
太原理工大学
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 太原理工大学 filed Critical 太原理工大学
Priority to CN201510531253.6A priority Critical patent/CN105136178B/en
Publication of CN105136178A publication Critical patent/CN105136178A/en
Application granted granted Critical
Publication of CN105136178B publication Critical patent/CN105136178B/en

Links

Abstract

The present invention relates to distributed optical fiber sensing system, the distribution type optical fiber sensing equipment and method of the relevant domain analysis of specifically a kind of chaos Brillouin light.The present invention solves the problem of existing distributed optical fiber sensing system can not take into account spatial resolution and distance sensing, distance sensing critical constraints, spatial resolution is low.The distribution type optical fiber sensing equipment of the relevant domain analysis of chaos Brillouin light, including wide range chaos semiconductor laser, 1 × 2 fiber coupler, light scrambler, optoisolator, the first image intensifer, variable optical delay line, the second image intensifer, optical circulator, sensor fibre, adjustable light wave-filter, wideband gain photodetector, data acquisition device, signal processing apparatus, display device.The present invention is applied to distributing optical fiber sensing field.

Description

The distribution type optical fiber sensing equipment and method of the relevant domain analysis of chaos Brillouin light
Technical field
The present invention relates to distributed optical fiber sensing system, the distribution of the relevant domain analysis of specifically a kind of chaos Brillouin light Fibre-optical sensing device and method.
Background technology
Distributed optical fiber sensing system is because with distributed measurement, monitoring distance length, spatial resolution height, response time Hurry up, the advantage such as electromagnetism interference, be widely used in Aero-Space, petrochemical industry, power industry, nuclear industry, civil engineering And the field such as military affairs.At present, distributed optical fiber sensing system can be divided into following three kinds according to the scattering mechanism in optical fiber:Based on auspicious Profit scattering distributed optical fiber sensing system, the distributed optical fiber sensing system based on Raman scattering, based on Brillouin scattering Distributed optical fiber sensing system.Wherein, the distributed optical fiber sensing system based on Brillouin scattering is because it is in temperature and strain Measurement accuracy, distance sensing, the spatial resolution that can be reached in measurement have compared to other two kinds of distributed optical fiber sensing systems There is obvious advantage, and measured while realizing to temperature and strain, and the study hotspot as the field.
Under prior art conditions, the distributed optical fiber sensing system based on Brillouin scattering can be divided into the following two kinds:Base Distributed optical fiber sensing system in Brillouin light time domain, the distributed optical fiber sensing system based on Brillouin light coherent field.Its In, the distributed optical fiber sensing system based on Brillouin light time domain is limited because of its own principle, and Existential Space resolution ratio is low, measurement The problem of time is long, causes its scope of application critical constraints(For example, it is not suitable for aircraft wing, rocket and wind turbine leaf The distributed sensing detection of the configuration states such as piece).Distributed optical fiber sensing system based on Brillouin light coherent field can be divided into again The following two kinds:Based on the reflection of Brillouin light coherent field(BOCDR, Brillouin Optical Correlation Domain Reflectometry)Distributed optical fiber sensing system, based on Brillouin light be concerned with domain analysis(BOCDA, Brillouin Optical Correlation Domain Analysis)Distributed optical fiber sensing system.During compared to based on Brillouin light The distributed optical fiber sensing system in domain, the distributed optical fiber sensing system based on Brillouin light coherent field can significantly improve space Resolution ratio.For example, Kazuo Hotate of Tokyo Univ Japan et al. propose to carry out frequency modulation(PFM) to light source using sinusoidal signal, Can be configured to relevant peak has periodic coherent function, so as to realize that distance sensing is that 100m, spatial resolution are 40cm BOCDR systems(Optics Express, 2008, vol.16, no.16, 12148).In another example, Tokyo Univ Japan Kazuo Hotate et al. are using the output of sinusoidal signal frequency modulated light source, and it is that 20m, spatial resolution are to construct distance sensing 10cm BOCDA systems(Photonics Technology Letters, 2007, vol.19, no.23, 1928).So And, the distributed optical fiber sensing system based on Brillouin light coherent field is limited because of its own principle, and space point can not be taken into account by existing The problem of resolution and distance sensing.
In order to overcome the distributed optical fiber sensing system based on Brillouin light coherent field can not take into account spatial resolution and biography Sense apart from the problem of, Chinese patent ZL201310045097.3 discloses a kind of distribution based on chaotic laser light signal coherence method Fibre-optical sensing device and its measuring method.However, the device and its measuring method are limited because of its own principle, there is distance sensing The problem of critical constraints, low spatial resolution, it is specifically described as follows:On the one hand, the device and its measuring method are based on sensing What the spontaneous brillouin scattering process in optical fiber was realized, the Stokes produced due to the spontaneous brillouin scattering in sensor fibre Optical signal power causes its distance sensing to be severely limited than relatively low.On the other hand, in the device and its measuring method In, back scattered Stokes optical signal generates bright relative to the chaotic laser light signal as reference signal, its spectral width It is aobvious to narrow, cause its spatial resolution to be greatly reduced.
Based on this, it is necessary to invent a kind of brand-new distributed optical fiber sensing system, passed with solving existing distribution type fiber-optic The problem of sensing system can not take into account spatial resolution and distance sensing, distance sensing critical constraints, spatial resolution is low.
The content of the invention
The present invention can not take into account spatial resolution and distance sensing, sensing to solve existing distributed optical fiber sensing system Apart from critical constraints, spatial resolution is low the problem of there is provided a kind of chaos Brillouin light be concerned with domain analysis distribution type fiber-optic Sensing device and method.
The present invention adopts the following technical scheme that realization:The distributing optical fiber sensing of the relevant domain analysis of chaos Brillouin light Device, including wide range chaos semiconductor laser, 1 × 2 fiber coupler, light scrambler, optoisolator, the first image intensifer, Variable optical delay line, the second image intensifer, optical circulator, sensor fibre, adjustable light wave-filter, wideband gain photodetection Device, data acquisition device, signal processing apparatus, display device;
Wherein, the exit end of wide range chaos semiconductor laser is connected with the incidence end of 1 × 2 fiber coupler;
First exit end of 1 × 2 fiber coupler is connected by single-mode fiber jumper with the incidence end of light scrambler;Light The exit end of scrambler is connected by the incidence end of single-mode fiber jumper and optoisolator;The exit end of optoisolator passes through single mode Optical patchcord is connected with the incidence end of the first image intensifer;The exit end of first image intensifer and one end of sensor fibre are connected;
Second exit end of 1 × 2 fiber coupler is connected by the incidence end of single-mode fiber jumper and variable optical delay line Connect;The exit end of variable optical delay line is connected by single-mode fiber jumper with the incidence end of the second image intensifer;Second light amplification The exit end of device is connected by the incidence end of single-mode fiber jumper and optical circulator;The reflection end of optical circulator and sensor fibre The other end is connected;
The exit end of optical circulator is connected by the incidence end of single-mode fiber jumper and adjustable light wave-filter;Tunable optical The exit end of wave filter is connected by single-mode fiber jumper with the incidence end of wideband gain photodetector;Wideband gain photoelectricity is visited The signal output part for surveying device is connected by the signal input part of coaxial cable for high frequency and data acquisition device;Data acquisition device Signal output part is connected by the signal input part of coaxial cable for high frequency and signal processing apparatus;The signal of signal processing apparatus is defeated Go out end to be connected with the signal input part of display device.
The distributing optical fiber sensing method of the relevant domain analysis of chaos Brillouin light(This method is in chaos cloth of the present invention In deep light be concerned with the distribution type optical fiber sensing equipment of domain analysis and realize), this method is using following steps realization:
A. the wide range chaotic laser light signal that wide range chaos semiconductor laser is sent is divided into two-way through 1 × 2 fiber coupler: First via wide range chaotic laser light signal is as detection optical signal, and second has a lot of social connections spectrum chaotic laser light signal as pump light signals;Visit Light signal successively through light scrambler, optoisolator, the first image intensifer disturb partially, isolate, be amplified into sensor fibre; Pump light signals are postponed through variable optical delay line, the second image intensifer, optical circulator, are amplified successively, go in ring after enter and pass Photosensitive fibre;
B. occur stimulated Brillouin scattering at a certain position of the detection optical signal and pump light signals in sensor fibre to make With, thus produce Stokes optical signal;Stokes optical signal and pump light signals interfere beat frequency effect, thus produce Beat frequency optical signal;Beat frequency optical signal carries out entering adjustable light wave-filter after going in ring through optical circulator, and is filtered through tunable optical Device, which is filtered out, enters wideband gain photodetector after noise, be then converted to electric signal through wideband gain photodetector;Telecommunications Enter signal processing apparatus after number carrying out A/D conversions through data acquisition device, and analyzed, thus must through signal processing apparatus Occur the temperature at the position of stimulated Brillouin scattering effect in sensor fibre to detection optical signal and pump light signals and answer Become information;The light path of pump light signals can be adjusted by variable optical delay line so that detection optical signal and pump light signals exist Stimulated Brillouin scattering effect occurs at diverse location in sensor fibre, the temperature of any position in sensor fibre is thus obtained Degree and strain information;Temperature and strain information are shown by display device.
Compared with existing distributed optical fiber sensing system, the distribution of the relevant domain analysis of chaos Brillouin light of the present invention Formula fibre-optical sensing device and method have the following advantages that:First, with the distributing optical fiber sensing system based on Brillouin light coherent field System is compared, and the distribution type optical fiber sensing equipment and method of the relevant domain analysis of chaos Brillouin light of the present invention are to utilize chaos Laser signal carries out distributing optical fiber sensing detection, can only because chaotic laser light signal is a kind of laser signal of low phase dry state Relevant effect, therefore the distribution of the relevant domain analysis of chaos Brillouin light of the present invention are produced with its optical signal replicated completely The spatial resolution of formula fibre-optical sensing device and method only determines by the coherence length of chaotic laser light signal, and with distance sensing without Close, thus it can take into account spatial resolution and distance sensing completely, so as to thoroughly overcome based on Brillouin light coherent field The problem of distributed optical fiber sensing system can not take into account spatial resolution and distance sensing.Second, and Chinese patent A kind of distribution type optical fiber sensing equipment and its measurement based on chaotic laser light signal coherence method disclosed in ZL201310045097.3 Method is compared, and the distribution type optical fiber sensing equipment and method of the relevant domain analysis of chaos Brillouin light of the present invention are with as follows Advantage:On the one hand, the device and method is realized based on the Stimulated Brillouin Scattering Process in sensor fibre, due to sense light The Stokes optical signal that stimulated Brillouin scattering in fibre is produced is relative to the stokes light that spontaneous brillouin scattering is produced Signal power is higher so that distance sensing has obtained very big extension.On the other hand, in the device and method, due to stoke Interference beat frequency process and Stimulated Brillouin Scattering Process between this optical signal and pump light signals are carried out simultaneously, not only cause this Lentor optical signal its spectrum in transmitting procedure will not be influenceed by optical fiber transmission property, and cause stokes light letter Number spectral width will not produce the phenomenon that narrows so that spatial resolution is greatly improved(Experiment shows, of the invention It is public that the distribution type optical fiber sensing equipment of the relevant domain analysis of described chaos Brillouin light and the distance sensing of method can reach hundreds of In, spatial resolution can reach submillimeter magnitude).
The present invention, which efficiently solves existing distributed optical fiber sensing system, can not take into account spatial resolution and distance sensing, biography Sense apart from critical constraints, spatial resolution is low the problem of, it is adaptable to distributing optical fiber sensing field.
Brief description of the drawings
Fig. 1 is the structural representation of the distribution type optical fiber sensing equipment of the relevant domain analysis of chaos Brillouin light of the present invention.
In figure:1- wide range chaos semiconductor lasers, the fiber coupler of 2-1 × 2,3- light scramblers, 4- optoisolators, 5- First image intensifer, 6- variable optical delay lines, the image intensifers of 7- second, 8- optical circulators, 9- sensor fibres, 10- tunable opticals Wave filter, 11- wideband gain photodetectors, 12- data acquisition devices, 13- signal processing apparatus, 14- display devices.
Embodiment
The distribution type optical fiber sensing equipment of the relevant domain analysis of chaos Brillouin light, including wide range chaos semiconductor laser 1, 1 × 2 fiber coupler 2, light scrambler 3, optoisolator 4, the first image intensifer 5, variable optical delay line 6, the second image intensifer 7th, optical circulator 8, sensor fibre 9, adjustable light wave-filter 10, wideband gain photodetector 11, data acquisition device 12, letter Number processing unit 13, display device 14;
Wherein, the exit end of wide range chaos semiconductor laser 1 is connected with the incidence end of 1 × 2 fiber coupler 2;
First exit end of 1 × 2 fiber coupler 2 is connected by single-mode fiber jumper with the incidence end of light scrambler 3; The exit end of light scrambler 3 is connected by single-mode fiber jumper with the incidence end of optoisolator 4;The exit end of optoisolator 4 leads to The incidence end that single-mode fiber jumper is crossed with the first image intensifer 5 is connected;The exit end of first image intensifer 5 and sensor fibre 9 One end is connected;
The incidence end that second exit end of 1 × 2 fiber coupler 2 passes through single-mode fiber jumper and variable optical delay line 6 Connection;The exit end of variable optical delay line 6 is connected by single-mode fiber jumper with the incidence end of the second image intensifer 7;Second light The exit end of amplifier 7 is connected by single-mode fiber jumper with the incidence end of optical circulator 8;The reflection end and biography of optical circulator 8 Photosensitive fine 9 other end connection;
The exit end of optical circulator 8 is connected by single-mode fiber jumper with the incidence end of adjustable light wave-filter 10;It is adjustable The exit end of humorous optical filter 10 is connected by single-mode fiber jumper with the incidence end of wideband gain photodetector 11;Broadband increases The signal output part of beneficial photodetector 11 is connected by coaxial cable for high frequency with the signal input part of data acquisition device 12;Number It is connected according to the signal output part of harvester 12 by coaxial cable for high frequency with the signal input part of signal processing apparatus 13;Signal The signal output part of processing unit 13 is connected with the signal input part of display device 14.
The distributing optical fiber sensing method of the relevant domain analysis of chaos Brillouin light(This method is in chaos cloth of the present invention In deep light be concerned with the distribution type optical fiber sensing equipment of domain analysis and realize), this method is using following steps realization:
A. 2 points through 1 × 2 fiber coupler of the wide range chaotic laser light signal that wide range chaos semiconductor laser 1 is sent is two Road:First via wide range chaotic laser light signal is as detection optical signal, and second has a lot of social connections spectrum chaotic laser light signal as pump light signals; Detection optical signal successively through light scrambler 3, optoisolator 4, the first image intensifer 5 disturb partially, isolate, be amplified into sensing Optical fiber 9;Pump light signals are postponed through variable optical delay line 6, the second image intensifer 7, optical circulator 8, amplify, go in ring successively Enter sensor fibre 9 afterwards;
B. occur stimulated Brillouin scattering at a certain position of the detection optical signal and pump light signals in sensor fibre 9 to make With, thus produce Stokes optical signal;Stokes optical signal and pump light signals interfere beat frequency effect, thus produce Beat frequency optical signal;Beat frequency optical signal carries out entering adjustable light wave-filter 10 after going in ring through optical circulator 8, and is filtered through tunable optical Ripple device 10, which is filtered out, enters wideband gain photodetector 11 after noise, be then converted to telecommunications through wideband gain photodetector 11 Number;Electric signal enters signal processing apparatus 13 after carrying out A/D conversions through data acquisition device 12, and enters through signal processing apparatus 13 Row analysis, thus obtains detecting optical signal and the position of stimulated Brillouin scattering effect occurs in sensor fibre 9 for pump light signals Put the temperature and strain information at place;The light path of pump light signals can be adjusted by variable optical delay line 6 so that detection optical signal Occur stimulated Brillouin scattering effect at the diverse location in sensor fibre 9 with pump light signals, thus obtain sensor fibre 9 The temperature and strain information of middle any position;Temperature and strain information are shown by display device 14.
When it is implemented, wide range chaos semiconductor laser 1 is swashed by dfb semiconductor of any two without built-in optoisolator Light device, linear chirp optical fiber grating, adjustable optical attenuator, Polarization Controller, fiber coupler are constituted.Wide range chaos semiconductor swashs The centre wavelength of light device 1 is 1550nm, spectral width more than 100GHz.The coupling ratio of 1 × 2 fiber coupler 2 is 50:50.The One image intensifer 5 uses erbium-doped fiber amplifier or semiconductor optical amplifier.Variable optical delay line 6 is more using photoswitch control Road is classified fibre delay line and the automatically controlled variable optical delay line of MDL-002 types of connecting is combined.Second image intensifer 7 uses er-doped Fiber amplifier or semiconductor optical amplifier.Sensor fibre 9 is 200 km using the serial single-mode fibers of G652, its length.Broadband Gain photo-detector 11 uses Newport 1554-B type photodetectors.

Claims (2)

  1. The distribution type optical fiber sensing equipment of domain analysis 1. a kind of chaos Brillouin light is concerned with, it is characterised in that:Including wide range chaos Semiconductor laser(1), 1 × 2 fiber coupler(2), light scrambler(3), optoisolator(4), the first image intensifer(5), can Become optical delay line(6), the second image intensifer(7), optical circulator(8), sensor fibre(9), adjustable light wave-filter(10), broadband Gain photo-detector(11), data acquisition device(12), signal processing apparatus(13), display device(14);
    Wherein, wide range chaos semiconductor laser(1)Exit end and 1 × 2 fiber coupler(2)Incidence end connection;
    1 × 2 fiber coupler(2)First exit end pass through single-mode fiber jumper and light scrambler(3)Incidence end connection; Light scrambler(3)Exit end pass through single-mode fiber jumper and optoisolator(4)Incidence end connection;Optoisolator(4)Go out Penetrate end and pass through single-mode fiber jumper and the first image intensifer(5)Incidence end connection;First image intensifer(5)Exit end and biography Photosensitive fibre(9)One end connection;
    1 × 2 fiber coupler(2)Second exit end pass through single-mode fiber jumper and variable optical delay line(6)Incidence end Connection;Variable optical delay line(6)Exit end pass through single-mode fiber jumper and the second image intensifer(7)Incidence end connection;The Two image intensifers(7)Exit end pass through single-mode fiber jumper and optical circulator(8)Incidence end connection;Optical circulator(8)'s Reflection end and sensor fibre(9)The other end connection;
    Optical circulator(8)Exit end pass through single-mode fiber jumper and adjustable light wave-filter(10)Incidence end connection;It is adjustable Humorous optical filter(10)Exit end pass through single-mode fiber jumper and wideband gain photodetector(11)Incidence end connection;It is wide Band gain photo-detector(11)Signal output part pass through coaxial cable for high frequency and data acquisition device(12)Signal input End connection;Data acquisition device(12)Signal output part pass through coaxial cable for high frequency and signal processing apparatus(13)Signal it is defeated Enter end connection;Signal processing apparatus(13)Signal output part and display device(14)Signal input part connection.
  2. A kind of distributing optical fiber sensing method of domain analysis 2. chaos Brillouin light is concerned with, this method is as claimed in claim 1 Chaos Brillouin light be concerned with domain analysis distribution type optical fiber sensing equipment in realize, it is characterised in that:This method is using such as What lower step was realized:
    A. wide range chaos semiconductor laser(1)The wide range chaotic laser light signal sent is through 1 × 2 fiber coupler(2)It is divided into two Road:First via wide range chaotic laser light signal is as detection optical signal, and second has a lot of social connections spectrum chaotic laser light signal as pump light signals; Optical signal is detected successively through light scrambler(3), optoisolator(4), the first image intensifer(5)Progress disturb partially, isolate, amplify laggard Enter sensor fibre(9);Pump light signals are successively through variable optical delay line(6), the second image intensifer(7), optical circulator(8)Carry out Delay, amplification, go in ring after enter sensor fibre(9);
    B. detection optical signal and pump light signals are in sensor fibre(9)In a certain position at occur stimulated Brillouin scattering make With, thus produce Stokes optical signal;Stokes optical signal and pump light signals interfere beat frequency effect, thus produce Beat frequency optical signal;Beat frequency optical signal is through optical circulator(8)Carry out entering adjustable light wave-filter after going in ring(10), and through tunable Optical filter(10)Filter out and enter wideband gain photodetector after noise(11), then through wideband gain photodetector(11) Be converted to electric signal;Electric signal is through data acquisition device(12)Carry out entering signal processing apparatus after A/D conversions(13), and through letter Number processing unit(13)Analyzed, thus obtain detection optical signal and pump light signals in sensor fibre(9)It is middle to be excited Temperature and strain information at the position of Brillouin scattering effect;Pass through variable optical delay line(6)Pump light signals can be adjusted Light path so that detection optical signal and pump light signals in sensor fibre(9)In diverse location at occur excited Brillouin dissipate The effect of penetrating, thus obtains sensor fibre(9)The temperature and strain information of middle any position;Temperature and strain information pass through display Device(14)Shown.
CN201510531253.6A 2015-08-27 2015-08-27 The distribution type optical fiber sensing equipment and method of the relevant domain analysis of chaos Brillouin light CN105136178B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510531253.6A CN105136178B (en) 2015-08-27 2015-08-27 The distribution type optical fiber sensing equipment and method of the relevant domain analysis of chaos Brillouin light

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510531253.6A CN105136178B (en) 2015-08-27 2015-08-27 The distribution type optical fiber sensing equipment and method of the relevant domain analysis of chaos Brillouin light

Publications (2)

Publication Number Publication Date
CN105136178A CN105136178A (en) 2015-12-09
CN105136178B true CN105136178B (en) 2017-09-05

Family

ID=54721614

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510531253.6A CN105136178B (en) 2015-08-27 2015-08-27 The distribution type optical fiber sensing equipment and method of the relevant domain analysis of chaos Brillouin light

Country Status (1)

Country Link
CN (1) CN105136178B (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105928634B (en) * 2016-04-21 2018-10-26 太原理工大学 The temperature measuring device for high-voltage cable and method of the relevant domain analysis of single-ended Brillouin light
CN105783762B (en) * 2016-05-10 2018-04-06 太原理工大学 The brillouin distributed optical fiber sensing device and method of chaos correlation method positioning
CN105784195B (en) * 2016-05-10 2018-04-06 太原理工大学 The distribution type optical fiber sensing equipment and method of single-ended chaos Brillouin optical time domain analysis
CN106644103B (en) * 2016-09-18 2018-11-23 太原理工大学 A kind of system and method directly differentiating chaos light field Photon Statistical Properties
CN106441447B (en) * 2016-11-15 2018-12-11 太原理工大学 Distributed optical fiber sensing system based on chaos Brillouin's dynamic raster
CN107543567B (en) * 2017-08-11 2019-10-08 太原理工大学 BOCDA distribution type optical fiber sensing equipment and method based on the modulation of physical accidental code
CN107576392B (en) * 2017-09-08 2019-08-09 太原理工大学 A kind of identification device of the chaotic laser light exocoel time delay based on coherent field
CN107591678B (en) * 2017-09-08 2019-08-30 太原理工大学 A kind of recognition methods of the chaotic laser light exocoel time delay based on coherent field
CN107607135B (en) * 2017-09-19 2019-10-08 太原理工大学 A kind of chaos Brillouin light time domain/coherent field convergence analysis device and method
CN108180853B (en) * 2017-12-22 2020-04-03 太原理工大学 Brillouin optical time domain reflection strain detection device based on chaotic modulation
CN108844615B (en) * 2018-05-02 2020-05-22 太原理工大学 Distributed optical fiber sensing device and method based on chaotic Brillouin phase spectrum measurement
CN108827175B (en) * 2018-05-02 2020-02-11 太原理工大学 Distributed optical fiber dynamic strain sensing device and method based on broadband chaotic laser
CN109211433A (en) * 2018-10-19 2019-01-15 威海北洋光电信息技术股份公司 Distributed optical fiber temperature sensing device based on frequency domain parsing
CN110360982A (en) * 2019-06-03 2019-10-22 太原理工大学 The slope sedimentation of BOCDR based on super continuum source monitors system and method
CN110571641B (en) * 2019-08-27 2020-10-27 太原理工大学 Method and device for suppressing chaotic time delay by using broadband spontaneous emission quantum noise

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1310806A (en) * 1999-01-16 2001-08-29 韩国科学技术院 Optical isolator using stimulated Brillouin scattering phase conjugation, mirrors and its application to an optical amplifier system
CN102322806A (en) * 2011-08-01 2012-01-18 杭州欧忆光电科技有限公司 Brillouin optical time domain analyzer relevant to chaotic laser
CN202188857U (en) * 2011-08-10 2012-04-11 中国计量学院 Brillouin optical time domain analyzer of chaotic laser integrated optical fiber Raman amplifier
CN103123285A (en) * 2013-02-05 2013-05-29 太原理工大学 Distributed optical fiber sensing device based on chaotic laser coherence method, and measurement method of distributed optical fiber sensing device
CN104330939A (en) * 2014-11-21 2015-02-04 中国科学院半导体研究所 SBS broadband tunable optical fiber delay system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1310806A (en) * 1999-01-16 2001-08-29 韩国科学技术院 Optical isolator using stimulated Brillouin scattering phase conjugation, mirrors and its application to an optical amplifier system
CN102322806A (en) * 2011-08-01 2012-01-18 杭州欧忆光电科技有限公司 Brillouin optical time domain analyzer relevant to chaotic laser
CN202188857U (en) * 2011-08-10 2012-04-11 中国计量学院 Brillouin optical time domain analyzer of chaotic laser integrated optical fiber Raman amplifier
CN103123285A (en) * 2013-02-05 2013-05-29 太原理工大学 Distributed optical fiber sensing device based on chaotic laser coherence method, and measurement method of distributed optical fiber sensing device
CN104330939A (en) * 2014-11-21 2015-02-04 中国科学院半导体研究所 SBS broadband tunable optical fiber delay system

Also Published As

Publication number Publication date
CN105136178A (en) 2015-12-09

Similar Documents

Publication Publication Date Title
EP2702353B1 (en) Distributed brillouin sensing systems and methods using few-mode sensing optical fiber
Minardo et al. Distributed temperature sensing in polymer optical fiber by BOFDA
Dong et al. Extending the sensing range of Brillouin optical time-domain analysis combining frequency-division multiplexing and in-line EDFAs
EP2435796B1 (en) Optical sensor and method of use
Farahani et al. Spontaneous Raman scattering in optical fibers with modulated probe light for distributed temperature Raman remote sensing
RU2464542C2 (en) Detecting violation of phase of light propagating in optical waveguide
US6647160B1 (en) Fiber bragg grating sensor system
Li et al. Few-mode fiber based optical sensors
Soto et al. Simplex-coded BOTDA sensor over 120-km SMF with 1-m spatial resolution assisted by optimized bidirectional Raman amplification
CN103180702B (en) Optic fiber distributed temperature sensor system with self-correction function and temperature measuring method using thereof
CN101852655B (en) Distributed fiber Raman/Brillouin scattering sensor
Parker et al. Simultaneous distributed measurement of strain and temperature from noise-initiated Brillouin scattering in optical fibers
Martins et al. Real time dynamic strain monitoring of optical links using the backreflection of live PSK data
CN101910810B (en) Methods and systems for extending the range of fiber optic distributed temperature sensing (DTS) systems
CN103292903B (en) Spectrum analytical device and spectrum analytical method based on Brillouin dynamic grating
CN102506904B (en) Spontaneous Brillouin scattering optical time domain reflectometer based on superconductive nanowire single-proton detector
KR20140135196A (en) Sensing systems and few-mode optical fiber for use in such systems
CN101639388B (en) Raman related double-wavelength light source self-correction distributed optical fiber Raman temperature sensor
CN106441447B (en) Distributed optical fiber sensing system based on chaos Brillouin's dynamic raster
Soto et al. Analysis of optical pulse coding in spontaneous Brillouin-based distributed temperature sensors
CN101825498B (en) Distributed optical fiber Raman temperature sensor (DOFRTS) with self-correction of dispersion and loss spectra
CN103123285B (en) Distributed optical fiber sensing device based on chaotic laser coherence method, and measurement method of distributed optical fiber sensing device
US10113935B2 (en) Distributed multi-channel coherent optical fiber sensing system
CN102829806B (en) Optical fiber sensing system based on phase-shifted optical fiber grating
US10018558B2 (en) Distributed acoustic sensing in a multicore optical fiber using distributed mode coupling, delay, and simultaneous pulsing with selectable spatial modes

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
GR01 Patent grant