CN107990970A - The method for eliminating the noise that declines in distribution type fiber-optic acoustic systems - Google Patents

The method for eliminating the noise that declines in distribution type fiber-optic acoustic systems Download PDF

Info

Publication number
CN107990970A
CN107990970A CN201711067989.8A CN201711067989A CN107990970A CN 107990970 A CN107990970 A CN 107990970A CN 201711067989 A CN201711067989 A CN 201711067989A CN 107990970 A CN107990970 A CN 107990970A
Authority
CN
China
Prior art keywords
lt
gt
mo
mi
mn
Prior art date
Application number
CN201711067989.8A
Other languages
Chinese (zh)
Other versions
CN107990970B (en
Inventor
何祖源
刘庆文
陈典
Original Assignee
上海交通大学
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 上海交通大学 filed Critical 上海交通大学
Priority to CN201711067989.8A priority Critical patent/CN107990970B/en
Publication of CN107990970A publication Critical patent/CN107990970A/en
Application granted granted Critical
Publication of CN107990970B publication Critical patent/CN107990970B/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

A kind of method for eliminating the noise that declines in distribution type fiber-optic acoustic systems, by being ranked up respectively to the X states electric signal of the rayleigh backscattering light (RBS) from chirped optical pulse and Y states electric signal collected in chronological order in receiving terminal, and it is respectively divided into by frequency range after subsignal and matched filtering is carried out to each subsignal, then handle to obtain the reflectance curve of phase place using polarization diversity, the elimination of interference fading and polarization decay is realized after superimposed.Two kinds of polarization state light signals are superimposed present invention utilizes polarization diversity technology, can directly eliminate interference fading, polarization decay, and then eliminate phase demodulating mistake, achievees the purpose that to improve signal-to-noise ratio and is accurately positioned.

Description

The method for eliminating the noise that declines in distribution type fiber-optic acoustic systems

Technical field

The present invention relates to a kind of technology in distributing optical fiber sensing field, is specifically a kind of elimination distribution type fiber-optic sound The method of decline noise in wave system system.

Background technology

Distribution type fiber-optic sonic sensor (Distributed Fiber-optic Acoustic Sensor, DAS) is one Kind sensing probe is used as by the use of optical fiber, can detect and position the strain signal of generation any position on optical fiber, and can be with Linearly obtain the sensor of strain signal waveform.When current most of DAS system structure is the light based on phase sensitive Domain reflectometer (Phase Sensitive Optical Time Domain Reflectometry,- OTDR).- OTDR is tied Structure mutation is very much, but basic principle is:Launch the light pulse of high coherence into sensor fibre, obtained using suitable demodulating algorithm On sensor fibre the strength information of the rayleigh backscattering light (Rayleigh Backscattering, RBS) of each pip and Phase information.- OTDR has certain advantage, for example system structure is simple and reliable, demodulating algorithm is simply easily realized, sensitivity It is high, can be detected with multiple spot etc..

The content of the invention

The present invention can be influenced for the existing DAS system based on Rayleigh scattering light be subject to decline noise (Fading), be carried Go out a kind of method for eliminating the noise that declines in distribution type fiber-optic acoustic systems, make use of polarization diversity technology by two kinds of polarization state lights Signal averaging, can directly eliminate interference fading, polarization decay, and then eliminate phase demodulating mistake, reach improve signal-to-noise ratio and The purpose of accurate positionin.

The present invention is achieved by the following technical solutions:

The present invention relates to it is a kind of eliminate distribution type fiber-optic acoustic systems in decline noise method, by receiving terminal on time Between order the X states electric signal of the rayleigh backscattering light (RBS) from chirped optical pulse and Y states electric signal that collect are distinguished Be ranked up, and be respectively divided into by frequency range after subsignal and matched filtering is carried out to each subsignal, then using polarization diversity at Reason obtains the reflectance curve of phase place, and the elimination of interference fading and polarization decay is realized after superimposed.

The polarization diversity processing refers to:With the X states of the rayleigh backscattering light of first chirped optical pulse and Y states electricity The reflectance curve of signal is conjugated phase as reference, with the reflectance curve of the rayleigh backscattering light of other chirped optical pulses Multiply, obtain the reflectance curve of phase place, averaged computing, obtain no interference fading reflectance curve and addition after obtain Eliminate the integrated reflectance curve of interference fading and polarization decay.

The reflectance curve, further obtains the exact position of fibre strain, specifically by detecting its phase place change For:Integrated reflectance curve is obtained after all reflectance curves are added, its phase term obtained from after delay difference processing To differenced phase plot;Again to seeking standard deviation at the every bit on the differenced phase plot of each chirped optical pulse, when phase mark It is to judge that the optical fiber between corresponding points strains that quasi- difference, which exceedes threshold value,.

The present invention relates to a kind of de-noising unit for realizing the above method, including:The sorting module that is sequentially connected, matched filtering Module, differential phase computing module and strain locating module, wherein:Sorting module is electric by the X states electric signal after sequence and Y states Signal, which is divided into the subsignal of multiple frequency ranges and exports to matched filtering module, carries out frequency-division section matched filtering, matched filtering module Calculated with handling to obtain integrated reflectance curve by polarization diversity after filtering and exporting to differential phase computing module, differential phase Module extracts phase term from integrated reflectance curve and carries out obtaining phase difference curve from delay difference processing, answers set Position module each point in the phase difference curve of each chirped optical pulse is calculated standard deviation and judging obtain strain occur it is accurate Position.

Brief description of the drawings

Fig. 1 is distribution type fiber-optic acoustic save sensor systems figure;

Fig. 2 be signal generator output chirped pulse sequence when-frequency analysis figure.

Fig. 3 is the phase standard dygoram of embodiment output;

Fig. 4 is the strain waveform figure of embodiment output;

Fig. 5 is the strain signal power density spectrogram of embodiment output;

In figure:1 it is signal generating module, 2 be radio frequency signal amplifiers, 3 be laser, 4 is polarization-maintaining fiber coupler, 5 For acousto-optic modulator, 6 be erbium-doped fiber amplifier, 7 be optical fiber circulator, 8 be sensor fibre, 9 be optical splitter, 10 be polarization point Beam device, 11 be polarization beam apparatus, 12 be balance photodetector, 13 be balance photodetector, 14 be data collecting card, 15 be De-noising unit.

Embodiment

As shown in Figure 1, the present embodiment includes:Signal generating module 1 and radiofrequency signal as signal generating module are put Big device 2, as the laser 3 and polarization-maintaining fiber coupler 4 of high coherent laser module, the sound as chirped optical pulse generation module Optical modulator 5 and erbium-doped fiber amplifier 6, polarization-maintaining fiber coupler 4, optical fiber circulator 7, sensor fibre 8, as polarization diversity The optical splitter 9 of receiving module, polarization beam apparatus 11, balance photodetector 12 and balance photodetector 13 and as data Collection and the data collecting card 14 and de-noising unit 15 of processing module, wherein:Signal generating module produces mould to chirped optical pulse The chirped pulse sequence of block input power amplification, while send trigger signal to data acquisition and processing (DAP) module;High associated laser The height that mould laser 3 in the block produces is concerned with, the laser of frequency and power invariability is inputted to the first end of polarization-maintaining fiber coupler 4 Mouth a, the second port b outputs of polarization-maintaining fiber coupler 4 detect light to chirped optical pulse generation module, polarization-maintaining fiber coupler 4 The local light of the 3rd port c outputs to polarization diversity receiving module;The chirp of chirped optical pulse generation module output power amplification Light pulse sequence, inputs from the first port a of optical fiber circulator 7, is exported from second port b to sensor fibre 8;Sensor fibre 8 The RBS of generation, into the second port b of optical fiber circulator 7, enters polarization diversity receiving module from the 3rd port c;Polarization diversity The electric signal of X states and the electric signal of Y states of receiving module output switch to digital data transmission to de-noising list by data collecting card 14 Data processing is carried out in member 15.

The sensor fibre 8 is non-polarization-maintaining single-mode fiber, and total length is 10 kilometers.

As shown in Fig. 2, the chirped pulse sequence that the signal generator 1 exports includes:The time interval T such as multiple, phase With chirped frequency range delta F and same pulse width τpChirped pulse.

The time interval T of the chirped pulse sequence is 100 microseconds, and swept frequency range Δ F is 150~250MHz, pulse Width τpFor 2 microseconds.

The splitting ratio of the polarization-maintaining fiber coupler 4 is 90 to 10.

The bandwidth of the balance photodetector is AC-400MHz.

The sample rate of the data collecting card 14 is 1GSPS, and quantization resolution is 8 bits.

The present embodiment is related to the signal processing method of said system, comprises the following steps:

The X for the rayleigh backscattering light (RBS) from a chirped optical pulse that step 1, data collecting card 14 collect State electric signal { x (k);K=1 ..., 100000 } and Y state electric signals { y (k);K=1 ..., 100000 }, wherein k represents length Unit, corresponding 10 kilometers of sensor fibres 8, the length of each length unit is 0.1 meter;When known totally 200 chirped light arteries and veins When rushing, sort in chronological order to all X states electric signals and Y states electric signal, i.e.,:X states signal is { x (n, k);N=1 ..., 200;K=1 ..., 100000 }, Y states signal is { y (n, k);N=1 ..., 200;K=1 ..., 100000 };De-noising unit 15 three frequency ranges of generation are respectively the digital band-pass filter of 150-200MHz, 175-225MHz and 200-250MHz, will be each Electric signal is separated into three subsignals, i.e.,:

{xl(n,k);N=1 ..., 200;K=1 ..., 100000;L=1,2,3 } and

{yl(n,k);N=1 ..., 200;K=1 ..., 100000;L=1,2,3 }.

Matched filtering module in step 2, de-noising unit 15 generates the matched filter { h of above-mentioned each subsignall (k);K=1 ..., 2000;L=1,2,3 }, matched filtering is done to each subsignal, obtains the reflectance curve of sensor fibre 8, I.e.:

Wherein:I is index, and * represents conjugate operation.

Step 3, take first chirped optical pulse rayleigh backscattering light (RBS) X state reflectance curves { RXl(1, k);K=1 ..., 100000;L=1,2,3 } and Y state reflectance curves { RYl(1,k);K=1 ..., 100000;L=1,2, 3 } as reference, with other reflectance curve conjugate multiplications, the reflectance curve of phase place is obtained, i.e.,:

With

{RYl' (n, k)=RYl(n,k)×RYl *(1,k);N=1 ..., 200;K=1 ..., 100000;L=1,2, 3}。

Step 4, the reflectance curve of the phase RZ obtained to previous step do average calculating operation, obtain no interference fading Reflectance curve, i.e.,:

With

Step 5, be directly added X states without interference fading reflectance curve with Y states without interference fading reflectance curve, No interference fading and the integrated reflectance curve of no polarization decline are obtained, i.e.,:

R (n, k)=RX " (n, k)+RY " (n, k);N=1 ..., 200;K=1 ..., 100000;}.

Step 6, the phase term by integrated reflectance curve, i.e. phase curve { φ (n, k)=angle [R (n, k)];N= 1,…,200;K=1 ..., 100000 }, postpone 50 length unit k, the front and rear phase curve that will be delayed does calculus of differences, obtains To differenced phase plot, i.e.,:

{ Δ φ (n, k)=φ (n, k)-φ (n, k-50);N=1 ..., 200;K=1 ..., 100000 }.

Step 7, to seeking standard deviation at each point of all 200 differenced phase plots, obtain a phase standard difference curve,As shown in Figure 3;From k=in the phase standard difference curve 97630 to k=97730 standard deviation is more than 0.05rad, then judges that this section of optical fiber strains, its actual range is z=9763 For rice at z=9773m, strain waveform is as shown in Figure 4.

Distribution type fiber-optic sonic sensor of the present embodiment based on no interference fading proposed by the present invention and polarization decay, from Fig. 3 can be seen that all decline points are eliminated, and the strain of sensor fibre end is accurately positioned, strain waveform such as Fig. 4 of extraction Shown in Fig. 5, there is the extraordinary linearity and signal-to-noise ratio.

Above-mentioned specific implementation can by those skilled in the art on the premise of without departing substantially from the principle of the invention and objective with difference Mode carry out local directed complete set to it, protection scope of the present invention is subject to claims and not by above-mentioned specific implementation institute Limit, each implementation in the range of it is by the constraint of the present invention.

Claims (8)

1. it is a kind of eliminate distribution type fiber-optic acoustic systems in decline noise method, it is characterised in that by receiving terminal on time Between order the X states electric signal of the rayleigh backscattering light from chirped optical pulse and Y states electric signal that collect are carried out respectively Sequence, and be respectively divided into by frequency range after subsignal and matched filtering is carried out to each subsignal, then handled using polarization diversity To the reflectance curve of phase place, the elimination of interference fading and polarization decay is realized after superimposed.
2. according to the method described in claim 1, it is characterized in that, the polarization diversity processing refers to:With first chirped light The X states of the rayleigh backscattering light of pulse and the reflectance curve of Y state electric signals are as reference, auspicious with other chirped optical pulses The reflectance curve conjugate multiplication of sharp back-scattering light, obtains the reflectance curve of phase place, averaged computing, obtains without dry Relate to the integrated reflectance curve of be eliminated after the reflectance curve of decline and addition interference fading and polarization decay.
3. method according to claim 1 or 2, it is characterized in that, the reflectance curve, further by detecting its phase Position change obtains the exact position of fibre strain, is specially:Integrated reflectance curve is obtained after all reflectance curves are added, Its phase term is carried out to obtain differenced phase plot from after delay difference processing;It is bent to the differential phase of each chirped optical pulse again Standard deviation is sought at every bit on line, is to judge that the optical fiber between corresponding points strains when phase standard difference exceedes threshold value.
4. method according to claim 1 or 2, it is characterized in that, the reflectance curve is specially:
<mrow> <mo>{</mo> <msub> <mi>RX</mi> <mi>l</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>,</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>=</mo> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mrow> <mn>2000</mn> <mo>-</mo> <mi>i</mi> </mrow> </munderover> <msub> <mi>x</mi> <mi>l</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>,</mo> <mi>i</mi> <mo>)</mo> </mrow> <msubsup> <mi>h</mi> <mi>l</mi> <mo>*</mo> </msubsup> <mrow> <mo>(</mo> <mi>i</mi> <mo>+</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>;</mo> <mi>n</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mo>...</mo> <mo>,</mo> <mn>200</mn> <mo>;</mo> <mi>k</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mo>...</mo> <mo>,</mo> <mn>100000</mn> <mo>;</mo> <mi>l</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mn>2</mn> <mo>,</mo> <mn>3</mn> <mo>}</mo> </mrow>
<mrow> <mo>,</mo> <mo>{</mo> <msub> <mi>RY</mi> <mi>l</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>,</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>=</mo> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mrow> <mn>2000</mn> <mo>-</mo> <mi>i</mi> </mrow> </munderover> <msub> <mi>y</mi> <mi>l</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>,</mo> <mi>i</mi> <mo>)</mo> </mrow> <msubsup> <mi>h</mi> <mi>l</mi> <mo>*</mo> </msubsup> <mrow> <mo>(</mo> <mi>i</mi> <mo>+</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>;</mo> <mi>n</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mo>...</mo> <mo>,</mo> <mn>200</mn> <mo>;</mo> <mi>k</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mo>...</mo> <mo>,</mo> <mn>100000</mn> <mo>;</mo> <mi>l</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mn>2</mn> <mo>,</mo> <mn>3</mn> <mo>}</mo> <mo>,</mo> </mrow>
Wherein:I is index, and * represents conjugate operation, { xl(n,k);N=1 ..., 200;K=1 ..., 100000;L=1, 2,3 } and { yl(n,k);N=1 ..., 200;K=1 ..., 100000;L=1,2,3 } it is subsignal, { x (n, k);N= 1,...,200;K=1 ..., 100000 } and { y (n, k);N=1 ..., 200;K=1 ..., 100000 } it is respectively X states and Y State signal, k represent length unit.
5. method according to claim 1 or 2, it is characterized in that, polarization diversity processing, comprises the following steps:
1. by the X states reflectance curve of the rayleigh backscattering light of first chirped optical pulse and Y states reflectance curve and other Reflectance curve conjugate multiplication, obtains the reflectance curve of phase place, i.e.,:
{ RYl'(n,k) =RYl(n,k)×RYl *(1,k);N=1 ..., 200;K=1 ..., 100000;L=1,2,3 };
2. the reflectance curve of the phase RZ to obtaining does average calculating operation, the reflectance curve of no interference fading is obtained, i.e.,:
With
<mrow> <mo>{</mo> <msup> <mi>RY</mi> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msup> <mrow> <mo>(</mo> <mi>n</mi> <mo>,</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>=</mo> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>l</mi> <mo>=</mo> <mn>1</mn> </mrow> <mn>3</mn> </munderover> <msup> <msub> <mi>RY</mi> <mi>l</mi> </msub> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msup> <mrow> <mo>(</mo> <mi>n</mi> <mo>,</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>;</mo> <mi>n</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mo>...</mo> <mo>,</mo> <mn>200</mn> <mo>;</mo> <mi>k</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mo>...</mo> <mo>,</mo> <mn>100000</mn> <mo>;</mo> <mo>}</mo> <mo>;</mo> </mrow>
3. being directly added without interference fading reflectance curve with Y states without interference fading reflectance curve to X states, obtain without dry The integrated reflectance curve of decline and no polarization decline is related to, i.e.,:R (n, k)=RX " (n, k)+RY " (n, k);N=1 ..., 200;K=1 ..., 100000;}.
6. according to the method described in claim 3, it is characterized in that, the phase place change, by by all reflectance curve phases The phase term of integrated reflectance curve, i.e. phase curve { φ (n, k)=angle [R (n, k)] are extracted after adding;N=1 ..., 200; K=1 ..., 100000 }, postpone 50 length unit k, the front and rear phase curve that will be delayed does calculus of differences, obtains differential phase Curve, i.e.,:{ Δ φ (n, k)=φ (n, k)-φ (n, k-50);N=1 ..., 200;K=1 ..., 100000 };To all 200 Standard deviation is sought at each point of bar differenced phase plot, obtains phase standard difference curve
A kind of 7. de-noising unit for realizing any of the above-described claim the method, it is characterised in that including:The row being sequentially connected Sequence module, matched filtering module, differential phase computing module and strain locating module, wherein:Sorting module is by the X after sequence State electric signal and Y state electric signals, which are divided into the subsignal of multiple frequency ranges and export to matched filtering module, carries out frequency-division section matching filter Ripple, by polarization diversity handles to obtain integrated reflectance curve after matched filtering module matched filtering and exports to differential phase and calculate Module, differential phase computing module extract phase term from integrated reflectance curve and carry out obtaining phase from delay difference processing Potential difference component curve, strain locating module calculate each point in the phase difference curve of each chirped optical pulse standard deviation and judge Obtain strain and exact position occurs.
A kind of 8. detecting system for including de-noising unit described in claim 7, it is characterised in that including:Mould occurs as signal The signal generating module and radio frequency signal amplifiers of block, as the laser and polarization-maintaining fiber coupler of high coherent laser module, As the acousto-optic modulator and erbium-doped fiber amplifier of chirped optical pulse generation module, polarization-maintaining fiber coupler, optical fiber circulator, Sensor fibre, as the optical splitter of polarization diversity receiving module, polarization beam apparatus, balance photodetector and balance photodetection Device and data collecting card and de-noising unit as data acquisition and processing (DAP) module, wherein:Signal generating module is to chirped light The chirped pulse sequence of pulses generation module input power amplification, while send trigger signal to data acquisition and processing (DAP) module; The height that high associated laser mould laser in the block produces is concerned with, the laser of frequency and power invariability is inputted to polarization-maintaining fiber coupler First port, the second port output detection light of polarization-maintaining fiber coupler is to chirped optical pulse generation module, polarization maintaining optical fibre coupling 3rd port of clutch exports local light to polarization diversity receiving module;The Zhou of chirped optical pulse generation module output power amplification Sing light pulse sequence, input from the first port of optical fiber circulator, exported from second port to sensor fibre;Sensor fibre produces RBS, into the second port of optical fiber circulator, enter polarization diversity receiving module from the 3rd port;Polarization diversity receives mould The electric signal of X states and the electric signal of Y states of block output switch to digital data transmission into de-noising unit by data collecting card to carry out Data processing.
CN201711067989.8A 2017-11-03 2017-11-03 The method for eliminating the noise that declines in distribution type fiber-optic acoustic systems CN107990970B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711067989.8A CN107990970B (en) 2017-11-03 2017-11-03 The method for eliminating the noise that declines in distribution type fiber-optic acoustic systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711067989.8A CN107990970B (en) 2017-11-03 2017-11-03 The method for eliminating the noise that declines in distribution type fiber-optic acoustic systems

Publications (2)

Publication Number Publication Date
CN107990970A true CN107990970A (en) 2018-05-04
CN107990970B CN107990970B (en) 2019-10-15

Family

ID=62031273

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711067989.8A CN107990970B (en) 2017-11-03 2017-11-03 The method for eliminating the noise that declines in distribution type fiber-optic acoustic systems

Country Status (1)

Country Link
CN (1) CN107990970B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110118594A (en) * 2019-04-22 2019-08-13 华中科技大学 One kind is based on the received optical phase demodulation method of polarization split pole and system

Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62123327A (en) * 1985-11-22 1987-06-04 Anritsu Corp Coherent otdr apparatus
JPH09236513A (en) * 1996-02-29 1997-09-09 Advantest Corp Coherent otdr apparatus and coherent otdr-measuring method
CN1172254A (en) * 1995-11-01 1998-02-04 住友电气工业株式会社 Laser light source apparatus, OTDR apparatus, and optical communication line inspection system
JP3070880B2 (en) * 1992-02-28 2000-07-31 日本電信電話株式会社 Backscattered light of the measurement device
CN101488805A (en) * 2008-01-15 2009-07-22 电子科技大学 Optical fiber disturbance detection method and apparatus
CN101629855A (en) * 2008-07-18 2010-01-20 派克森公司 Distributed optical fiber sensing system and detection method utilizing same
CN101639379A (en) * 2009-08-26 2010-02-03 南京大学 Vibration monitoring structure and method based on optical fiber polarized light time domain reflection sense
CN102168953A (en) * 2011-01-12 2011-08-31 南京大学 Full-distributed optical fiber strain and vibration sensor based on coherent heterodyne detection
CN102412894A (en) * 2011-11-14 2012-04-11 南京大学 Multifrequency probe light time division multiplexing coherent light time domain reflectometer method and apparatus thereof
CN102761364A (en) * 2011-04-29 2012-10-31 华为海洋网络有限公司 Method and device for detecting optical time domain detection signal
CN103401606A (en) * 2013-07-22 2013-11-20 国家电网公司 Coherent optical time-domain reflectometer based on detection frequency coding
CN103411660A (en) * 2013-08-29 2013-11-27 山东省科学院激光研究所 Optical fiber distributed type sound wave monitor system
JP5753834B2 (en) * 2012-12-20 2015-07-22 日本電信電話株式会社 Optical pulse test apparatus and optical pulse test method
CN204718622U (en) * 2015-06-10 2015-10-21 贵州电网公司信息通信分公司 A kind of relevant OTDR device
CN105067103A (en) * 2015-08-31 2015-11-18 上海交通大学 Vibration detection device and method based on optical frequency domain reflectometer
JP5941877B2 (en) * 2013-07-18 2016-06-29 日本電信電話株式会社 Optical pulse test apparatus and optical pulse test method
CN105953825A (en) * 2016-06-29 2016-09-21 上海交通大学 Fiber bragg grating type sensing system and method for simultaneous measurement of temperature and strain
CN106052842A (en) * 2016-08-05 2016-10-26 上海交通大学 Distributed fiber vibration sensing system capable of eliminating declining noises and demodulation method of system
CN106092305A (en) * 2016-08-25 2016-11-09 上海交通大学 Distributed optical fiber sensing system and vibration detection localization method thereof
CN106533547A (en) * 2016-10-19 2017-03-22 全球能源互联网研究院 Electric power optical fiber communication line fault monitoring device

Patent Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62123327A (en) * 1985-11-22 1987-06-04 Anritsu Corp Coherent otdr apparatus
JP3070880B2 (en) * 1992-02-28 2000-07-31 日本電信電話株式会社 Backscattered light of the measurement device
CN1172254A (en) * 1995-11-01 1998-02-04 住友电气工业株式会社 Laser light source apparatus, OTDR apparatus, and optical communication line inspection system
JPH09236513A (en) * 1996-02-29 1997-09-09 Advantest Corp Coherent otdr apparatus and coherent otdr-measuring method
CN101488805A (en) * 2008-01-15 2009-07-22 电子科技大学 Optical fiber disturbance detection method and apparatus
CN101629855A (en) * 2008-07-18 2010-01-20 派克森公司 Distributed optical fiber sensing system and detection method utilizing same
CN101639379A (en) * 2009-08-26 2010-02-03 南京大学 Vibration monitoring structure and method based on optical fiber polarized light time domain reflection sense
CN102168953A (en) * 2011-01-12 2011-08-31 南京大学 Full-distributed optical fiber strain and vibration sensor based on coherent heterodyne detection
CN102761364A (en) * 2011-04-29 2012-10-31 华为海洋网络有限公司 Method and device for detecting optical time domain detection signal
CN102412894A (en) * 2011-11-14 2012-04-11 南京大学 Multifrequency probe light time division multiplexing coherent light time domain reflectometer method and apparatus thereof
JP5753834B2 (en) * 2012-12-20 2015-07-22 日本電信電話株式会社 Optical pulse test apparatus and optical pulse test method
JP5941877B2 (en) * 2013-07-18 2016-06-29 日本電信電話株式会社 Optical pulse test apparatus and optical pulse test method
CN103401606A (en) * 2013-07-22 2013-11-20 国家电网公司 Coherent optical time-domain reflectometer based on detection frequency coding
CN103411660A (en) * 2013-08-29 2013-11-27 山东省科学院激光研究所 Optical fiber distributed type sound wave monitor system
CN204718622U (en) * 2015-06-10 2015-10-21 贵州电网公司信息通信分公司 A kind of relevant OTDR device
CN105067103A (en) * 2015-08-31 2015-11-18 上海交通大学 Vibration detection device and method based on optical frequency domain reflectometer
CN105953825A (en) * 2016-06-29 2016-09-21 上海交通大学 Fiber bragg grating type sensing system and method for simultaneous measurement of temperature and strain
CN106052842A (en) * 2016-08-05 2016-10-26 上海交通大学 Distributed fiber vibration sensing system capable of eliminating declining noises and demodulation method of system
CN106092305A (en) * 2016-08-25 2016-11-09 上海交通大学 Distributed optical fiber sensing system and vibration detection localization method thereof
CN106533547A (en) * 2016-10-19 2017-03-22 全球能源互联网研究院 Electric power optical fiber communication line fault monitoring device

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
˙IBRAHIM ÖLÇER 等: ""Adaptive Temporal Matched Filtering for Noise Suppression in Fiber Optic Distributed Acoustic Sensing"", 《SENSORS》 *
MEIQI REN 等: ""Theoretical and Experimental Analysis of φ-OTDR based on polarization diversity detection"", 《PHOTONICS TECHNOLOGY LETTERS》 *
XIAOYI BAO 等: ""Recent development in the distributed fiber optica acoustic and ultrasonic detection"", 《JOURNAL OF LIGHTWAVE TECHNOLOGY》 *
XINYU FAN 等: ""Distributed Fiber-Optic Vibration Sensing Based on Phase Extraction From Optical Reflectometry"", 《JOURNAL OF LIGHTWAVE TECHNOLOGY》 *
YUELAN LU 等: ""Distributed Vibration Sensor Based on Coherent Detection of Phase-OTDR"", 《JOURNAL OF LIGHTWAVE TECHNOLOGY》 *
YUSUKE KOSHIKIYA 等: ""High Resolution PNC-OFDR With Suppressed Fading Noise for Dispersive Media Measurement"", 《JOURNAL OF LIGHTWAVE TECHNOLOGY》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110118594A (en) * 2019-04-22 2019-08-13 华中科技大学 One kind is based on the received optical phase demodulation method of polarization split pole and system

Also Published As

Publication number Publication date
CN107990970B (en) 2019-10-15

Similar Documents

Publication Publication Date Title
Qin et al. High sensitivity distributed vibration sensor based on polarization-maintaining configurations of phase-OTDR
US8576389B2 (en) Multiple-acquisition OTDR method and device
CN102322880B (en) Polarization sensitive distributive optical frequency domain reflection disturbance sensor and demodulation method
CN102168953B (en) Full-distributed optical fiber strain and vibration sensor based on coherent heterodyne detection
CN101226100B (en) Chaos light time domain reflectometer and measuring method thereof
US9194763B2 (en) Optical time-domain reflectometry signal detection method and apparatus
Sun et al. Distributed fiber-optic vibration sensor using a ring Mach-Zehnder interferometer
EP1825613B1 (en) Assessing a network
US7227645B2 (en) Method and apparatus for measuring polarization mode dispersion
US8004686B2 (en) Compensating for time varying phase changes in interferometric measurements
EP1867072B1 (en) Communicating information
CN1913398B (en) Method for monitoring an optical transmission line, corresponding measuring device and optical transmitter
CN101813497B (en) Brillouin scattering spectrum real-time spectrum analyzing device and data processing method thereof
US8213002B2 (en) PON tester
CN101629855B (en) Distributed optical fiber sensing system and detection method utilizing same
CN102426198B (en) Acoustic emission signal sensing system based on matching-type fiber Bragg grating (FBG)
US5062704A (en) Optical time domain reflectometer having pre and post front panel connector testing capabilities
CN103954348B (en) Based on the distributed optical fiber vibration sensing system of differential pulse sequence
CN1164886C (en) Oil gas pipeline leak intelligent on line monitoring method based on distribution type optical fibre sensor
CN101255951B (en) Method for improving oil gas pipe leakage and performance of instruction testing distributed optical fibre sensor
US7228024B2 (en) Optical return loss detecting device
CN101603856B (en) Long-distance distributed optical fiber vibration sensing system and method thereof
CN102759371A (en) COTDR (coherent detection based optical time-domain reflectometry) fused long-distance coherent detection brilouin optical time-domain analyzer
EP1289174B1 (en) Measurement of polarization dependent loss in an optical transmission system
CN102829807B (en) BOTDA (Brillouin Optical Time Domain Analyzer) and POTDR (Polarization Optical Time Domain Reflectometer) combined distributed type optical fiber sensing system

Legal Events

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