CN102539113B - A kind of tracing analysis method based on Brillouin optical time domain analysis instrument BOTDA - Google Patents
A kind of tracing analysis method based on Brillouin optical time domain analysis instrument BOTDA Download PDFInfo
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- 238000012360 testing method Methods 0.000 claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000000835 fiber Substances 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 abstract description 4
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- 238000005516 engineering process Methods 0.000 description 9
- 239000013307 optical fiber Substances 0.000 description 6
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Abstract
Based on a tracing analysis method of Brillouin optical time domain analysis instrument BOTDA, said method comprising the steps of: the test curve file loading the BOTDA equipment that Omisense produces; Show its BOTDA curve; The test parameter of display BOTDA curve; Analyze the event information of BOTDA curve; BOTDA tracing analysis control is provided.The present invention analyzes and shows Brillouin optical time domain analysis instrument BOTDA test data, find out the technical method of its critical event point, and develop the display of BOTDA curve and anacom control based on this analytical approach, this control can show BOTDA curve, provide case point position and strain thereof or temperature information, solve an integrated BOTDA Test Application difficult problem in the related systems such as optical cable on-line monitoring.
Description
Technical field
The invention belongs to computing machine and optical communication field, be specifically related to a kind of tracing analysis method based on Brillouin optical time domain analysis instrument BOTDA.
Background technology
In optical fiber test, common method of testing is undertaken testing by optical time domain reflectometer OTDR (Optical Time DomainReflectometer) equipment or card and detects, this method can test the fibre circuit reaching up to a hundred kilometers, and joint in fibre circuit can be obtained and fuse dot information or disconnected fine information, substantially meet most of demand.But for the lightguide cable link of some special industry, may need to obtain the stressed of optical cable or strain information, such as, the operating environment of electric power special optical wire circuit sharply changes, the impact of the factor such as geologic hazard, making it that deformation occur causes lightguide cable link impaired, and penalty even interrupts.Especially the optical cable occurred for winter covers phenomenon.Like this, how grasp special optical cable ruuning situation in real time, the stressed and temperature variations of real-time monitoring analysis optical cable, Timeliness coverage potential faults, takes effective preventive measure, extremely important for the safe reliability improving communication of power system.
Distributed Optical Fiber Sensing Techniques is a kind of New Sensing Technology grown up based on the optical time domain reflection technology of widespread use in optical fiber engineering, is the focus in current Research on Sensing field.Propose short twenties years till now from late nineteen seventies in last century, Distributed Optical Fiber Sensing Techniques obtains and develops very soon.Research based on the distributed sensor technology of Brillouin scattering is started late, but the measuring accuracy, measurement range and the spatial resolution that reach in temperature, strain measurement due to it are all higher than other sensing technologies, and therefore this technology is obtaining extensive concern and research at present.Wherein based on Brillouin optical time domain analysis (BOTDA) technology because the detection of signal is easier to, research worldwide drops into larger, and technology is also comparatively ripe.Therefore, apply BOTDA technology and crucial decisive role is risen for the meteorotropic fault state of monitoring electric power special optical wire.
Be different from OTDR card, current BOTDA equipment only has the data of curve own, there is no event and warning information, this accurately checks calibration curve information in detail for wanting, fault point position difficulty is too high, therefore be necessary to make secondary analysis for BOTDA curve data, find out its warning information and carry out result display.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of tracing analysis method based on Brillouin optical time domain analysis instrument BOTDA, analyze and show Brillouin optical time domain analysis instrument BOTDA test data, find out the technical method of its critical event point, and develop the display of BOTDA curve and anacom control based on this analytical approach.This control can show BOTDA curve, provides case point position and strain thereof or temperature information.
In order to realize foregoing invention object, the invention provides following technical scheme:
Based on a tracing analysis method of Brillouin optical time domain analysis instrument BOTDA, said method comprising the steps of:
(1) the test curve file of BOTDA is loaded;
(2) BOTDA curve is shown;
(3) test parameter of BOTDA curve is shown;
(4) event information of BOTDA curve is analyzed;
(5) BOTDA tracing analysis control is provided.
In described step (1), BOTDA equipment is that Omisense produces, and the test curve file of loading is txt form, and is frequency response export.
The test curve file that described step (1) loads BOTDA comprises the following steps:
(1-1) analytic curve File header information;
(1-2) described test parameter information is resolved;
(1-3) test frequency response data is resolved.
Described step (2) display BOTDA curve shows test frequency response condition in software in the mode of broken line graph; The horizontal ordinate of described broken line graph is from luminous point to measuring fiber half length distance, and ordinate scope is from scanning initial frequency to scanning cutoff frequency; Described test parameter comprises initial frequency, cutoff frequency, pulsewidth, average and average gain.
The event information that described step (4) analyzes BOTDA curve comprises the following steps:
(4-1) defining variable i=0, note test data set is array data, note d=data [0];
(4-2) judge whether i is less than data.size (), namely i is not last recording mechanism, if then perform step (4-3), then terminates if not;
(4-3) d and data [i] is record data, and its Section 1 data [i] .x is test point position, and Section 2 data [i] .f is test point frequency;
(4-4) judge whether test point d and data [i] difference on the frequency is greater than 10KHz, if then perform step (4-5), then perform step (4-6) if not;
(4-5) make d=data [i], note new events point E, its correspondence position is data [i] .x, and E is put into list of thing;
(4-6) i++, and return step (4-2).
Compared with prior art, beneficial effect of the present invention is: analyze and show Brillouin optical time domain analysis instrument BOTDA test data, find out the technical method of its critical event point, and develop the display of BOTDA curve and anacom control based on this analytical approach, this control can show BOTDA curve, provides case point position and strain thereof or temperature information.The invention solves an integrated BOTDA Test Application difficult problem in the related systems such as optical cable on-line monitoring.
Accompanying drawing explanation
Fig. 1 is that Brillouin optical time domain analysis instrument BOTDA derives txt type curve file layout figure;
Fig. 2 is Brillouin optical time domain analysis instrument BOTDA tracing analysis control display different frequency response optical fiber curve map;
Fig. 3 is the display fibre-optical splice frequency response of Brillouin optical time domain analysis instrument BOTDA Curve Controls and test parameter figure;
Fig. 4 is that Brillouin optical time domain analysis instrument BOTDA curve case point position differentiates process flow diagram.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Based on a tracing analysis method of Brillouin optical time domain analysis instrument BOTDA, said method comprising the steps of:
(1) the test curve file of BOTDA is loaded; Test curve file is txt form, and is frequency response export;
The test curve file that described step (1) loads BOTDA comprises the following steps:
(1-1) analytic curve File header information; Header is the configuration information of testDate time, device parameter, version etc., under [FILEINFO] and [DITEST] tag block of this txt file, analytic method is for first to keep inspection [FILEINFO] tag block in mind, its the first row record is read after confirming, using ' t ' be divided into record name and record value as separator, the record value that inspection record is called Data is the test duration;
(1-2) described test parameter information is resolved; This information is under [MEASUREMENT] tag block.Its every line item of the same searching loop, using ' t ' be divided into record name and record value as separator, physical record name with value corresponding relation as follows:
Averaging correspondence test average time, Sensor Length (m) corresponding measuring fiber length, Sample Count correspond to test data point number, the record value of Sensor Length (m) is measuring fiber length, Spatial Resolution (m) corresponds to test point distance, the test of Sampling Interval (ns) correspondence pulsewidth, Frequency start (GHz) corresponding initial frequency, Frequency stop (GHz) corresponding cutoff frequency.
(1-3) test frequency response data is resolved; This information is under [DATA] tag block.Its every line item of searching loop, using ' t ' be divided into two parts as separator, respectively corresponding test point position (kilometer) and response frequency (GHz).
(2) BOTDA curve is shown; Namely test frequency response condition is intuitively shown in software in the mode of broken line graph.Horizontal ordinate is from luminous point to measuring fiber half length distance, here 50 meters of excess fiber lengths that remover apparatus is inner intrinsic are needed, ordinate scope is from scanning initial frequency to scanning cutoff frequency, and normally not by external force situation, the frequency response of optical fiber should about its characteristic frequency;
(2-1) according to first and last record length information determination horizontal ordinate data area of test data, be converted into rice, as control inside drawing horizontal ordinate data, outside display scale unit is kilometer, test starting point is divided into 10 deciles with test tip length, as distance scale, with this curve plotting figure horizontal ordinate;
(2-2) according to test initial frequency and cutoff frequency determination ordinate data area, KHz is converted into, as control inside drawing ordinate data, outside display scale unit is GHz, be divided into 10 deciles, as frequency scale, with this curve plotting figure ordinate;
(2-3) according to test data, each recorded information is Distance geometry frequency, the same, distance is converted to rice, frequency is converted into KHz, first drawing point is moved to first measuring point, from second record, make searching loop to the last till a record, draw from previous record position successively and link to current recording position, BOTDA frequency response curve can be drawn out.
(3) test parameter of BOTDA curve is shown; Described test parameter comprises initial frequency, cutoff frequency, pulsewidth, average and average gain;
(4) event information of BOTDA curve is analyzed; Difference different fiber centre frequency, intuitively shows the case point such as welding, joint information in frequency change mode.The present invention, according to the curve data be loaded into, take 10KHz as event distinguishing rule, namely thinks an event when test frequency drop is greater than 10KHz;
The event information that described step (4) analyzes BOTDA curve comprises the following steps:
(4-1) defining variable i=0, note test data set is array data, note d=data [0];
(4-2) judge whether i is less than data.size (), namely i is not last recording mechanism, if then perform step (4-3), then terminates if not;
(4-3) d and data [i] is record data, and its Section 1 data [i] .x is test point position, and Section 2 data [i] .f is test point frequency;
(4-4) judge whether test point d and data [i] difference on the frequency is greater than 10KHz, if then perform step (4-5), then perform step (4-6) if not;
(4-5) make d=data [i], note new events point E, its correspondence position is data [i] .x, and E is put into list of thing; (4-6) i++, and return step (4-2).
(5) BOTDA tracing analysis control is provided; This control integrated above step (1) ~ (4) feature content, and support free zoom function, frequency curve chart can full screen display.
Claims (1)
1., based on a tracing analysis method of Brillouin optical time domain analysis instrument BOTDA, it is characterized in that: said method comprising the steps of:
(1) the test curve file of BOTDA is loaded;
(2) BOTDA curve is shown;
(3) test parameter of BOTDA curve is shown;
(4) event information of BOTDA curve is analyzed;
(5) BOTDA tracing analysis control is provided;
It is that Omisense produces that described step (1) loads BOTDA equipment, and its test curve file is txt form;
The test curve file that described step (1) loads BOTDA is frequency response export;
The test curve file that described step (1) loads BOTDA comprises the following steps:
(1-1) analytic curve File header information;
(1-2) described test parameter information is resolved;
(1-3) test frequency response data is resolved;
Described step (2) display BOTDA curve shows test frequency response condition in software in the mode of broken line graph;
The horizontal ordinate of described broken line graph is from luminous point to measuring fiber half length distance, and ordinate scope is from scanning initial frequency to scanning cutoff frequency;
Described test parameter comprises initial frequency, cutoff frequency, pulsewidth, average and average gain;
The event information that described step (4) analyzes BOTDA curve comprises the following steps:
(4-1) defining variable i=0, note test data set is array data, note d=data [0];
(4-2) judge whether i is less than data.size (), namely i is not last recording mechanism, if then perform step (4-3), then terminates if not;
(4-3) d and data [i] is record data, and its Section 1 data [i] .x is test point position, and Section 2 data [i] .f is test point frequency;
(4-4) judge whether test point d and data [i] difference on the frequency is greater than 10KHz, if then perform step (4-5), then perform step (4-6) if not;
(4-5) make d=data [i], note new events point E, its correspondence position is data [i] .x, and E is put into list of thing;
(4-6) i++, and return step (4-2).
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| CN201110372255.7A CN102539113B (en) | 2011-11-21 | 2011-11-21 | A kind of tracing analysis method based on Brillouin optical time domain analysis instrument BOTDA |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102735996B (en) * | 2012-07-17 | 2014-12-03 | 国家电网公司 | Exact locating method for fault points of submarine cable |
| CN104866708B (en) * | 2015-04-16 | 2017-08-29 | 中国电子科技集团公司第四十一研究所 | A kind of BOTDR fibre strains distribution curve joining method |
| JP6791113B2 (en) * | 2017-12-27 | 2020-11-25 | 横河電機株式会社 | Optical fiber characteristic measuring device and optical fiber characteristic measuring method |
| CN113049014B (en) * | 2021-03-10 | 2022-04-15 | 太原理工大学 | Time-frequency multiplexing BOTDA system based on pumping light frequency sweep and sensing method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0690298A2 (en) * | 1994-06-29 | 1996-01-03 | Corning Incorporated | Optical waveguide spectral attenuation using an OTDR |
| CN1938575A (en) * | 2004-03-31 | 2007-03-28 | 英国电讯有限公司 | Evaluating the position of disturbance |
| CN101351689A (en) * | 2006-07-03 | 2009-01-21 | 安立股份有限公司 | Optical time domain reflectometer and method for testing optical fiber using optical pulse |
| CN101447832A (en) * | 2008-12-17 | 2009-06-03 | 安徽电力通信有限责任公司 | Method for measuring performance parameters of optical fiber cable circuit with ultra-long distance |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0674862A (en) * | 1992-08-25 | 1994-03-18 | Furukawa Electric Co Ltd:The | Method for detecting disconnection of light transmission path |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0690298A2 (en) * | 1994-06-29 | 1996-01-03 | Corning Incorporated | Optical waveguide spectral attenuation using an OTDR |
| CN1938575A (en) * | 2004-03-31 | 2007-03-28 | 英国电讯有限公司 | Evaluating the position of disturbance |
| CN101351689A (en) * | 2006-07-03 | 2009-01-21 | 安立股份有限公司 | Optical time domain reflectometer and method for testing optical fiber using optical pulse |
| CN101447832A (en) * | 2008-12-17 | 2009-06-03 | 安徽电力通信有限责任公司 | Method for measuring performance parameters of optical fiber cable circuit with ultra-long distance |
Non-Patent Citations (3)
| Title |
|---|
| COTDR信号去噪及曲线分析算法研究;岳明章;《中国优秀硕士学位论文全文数据库信息科技辑》;20101015(第10期);论文正文第39页倒数第1段，第41页1-6段 * |
| Omnisens.Fibre Optic Distributed Temperature and Strain Analyzer.《User Manual DITEST STA-R》.2009, * |
| OTDR远程光缆集中监测***研究;康晨;《中国优秀硕士学位论文全文数据库信息科技辑》;20071115(第05期);论文正文第25页第1-2段，第29页倒数第2段，第30-32页第4.3节第1-2段，第4.3.1节第1段，第4.3.2节第1-3段以及图4-6，图4-7 * |
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