CN108413889B - Optical fiber strain and transverse deformation coefficient calibration device and method based on BOTDR - Google Patents
Optical fiber strain and transverse deformation coefficient calibration device and method based on BOTDR Download PDFInfo
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- CN108413889B CN108413889B CN201810570328.5A CN201810570328A CN108413889B CN 108413889 B CN108413889 B CN 108413889B CN 201810570328 A CN201810570328 A CN 201810570328A CN 108413889 B CN108413889 B CN 108413889B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
- G01B21/042—Calibration or calibration artifacts
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- Testing Of Optical Devices Or Fibers (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a calibration device and a calibration method for optical fiber strain and transverse deformation coefficients based on BOTDR (Brillouin optical time Domain reflectometry), which comprises a main control computer, the BOTDR and an optical fiber strain generating device, wherein the main control computer is used for controlling the BOTDR to carry out optical fiber strain test and read strain data, the main control computer is used for controlling the optical fiber strain generating device to carry out quantitative and accurate transverse stretching on an optical fiber and obtain the transverse stretching displacement data of each continuous point on the optical fiber, and the main control computer calibrates the optical fiber strain and the transverse deformation coefficients according to the optical fiber strain data of different transverse stretching conditions and the transverse stretching displacement data of each corresponding continuous point. The device can automatically generate optical fiber strain, accurately measure the transverse line tensile displacement of each continuous point of the optical fiber, and realize the calibration of optical fiber strain and optical fiber transverse deformation coefficients of various types and specifications under the control of a central computer.
Description
Technical Field
The invention relates to a calibration device and method for optical fiber strain and transverse deformation coefficients based on BOTDR.
Background
The distributed optical fiber sensing technology has obvious advantages in geologic body natural disaster monitoring, and has the characteristics of wide monitoring range, continuous test data, corrosion resistance, no electromagnetic interference, small influence of environmental factors and the like. The distributed optical fiber strain testing instrument is mature, the research on the transverse tensile relationship between the optical fiber strain and the optical fiber is more important, but the calibration of the quantitative corresponding relationship between the optical fiber strain and the transverse tensile displacement of the optical fiber is more difficult, and meanwhile, the corresponding relationship of optical fibers with different types and specifications is different.
In the existing scheme, a displacement table is used for stretching an optical fiber along the axial direction of the optical fiber or stretching the optical fiber transversely manually, a dial indicator is used for manually reading displacement data of each point, the optical fiber strain has large error, only the transverse stretching displacement can be measured in a point-drawing mode, the displacement of each point on the optical fiber cannot be measured continuously, the deformation coefficient calibration error is large, and the influence on the relation research of the optical fiber strain and the optical fiber transverse deformation coefficient is large.
Disclosure of Invention
In order to solve the defects of the prior art, the invention designs a device and a method which are based on BOTDR, can automatically generate optical fiber strain and can accurately measure the transverse line tensile displacement of each continuous point of an optical fiber, and can realize the calibration of optical fiber strain and optical fiber transverse deformation coefficients of various types and specifications under the control of a central computer.
The invention aims to provide a calibration device for optical fiber strain and transverse deformation coefficients based on a BOTDR.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the BOTDR-based optical fiber strain and transverse deformation coefficient calibration device comprises a main control computer, the BOTDR and an optical fiber strain generating device, wherein the main control computer is used for controlling the BOTDR to perform optical fiber strain test and read strain data, the main control computer is used for controlling the optical fiber strain generating device to perform quantitative and accurate transverse stretching on an optical fiber and acquire transverse stretching displacement data of each continuous point on the optical fiber, and the main control computer calibrates optical fiber strain and transverse deformation coefficients according to the optical fiber strain data under different transverse stretching conditions and the corresponding transverse stretching displacement data of each continuous point.
Further, optic fibre strain generating device includes that optic fibre meets an emergency and takes place the platform, optic fibre meets an emergency and is equipped with optic fibre mounting fixture, optic fibre dead lever, electronic scale and automatically controlled displacement platform on the platform, optic fibre mounting fixture is used for adjusting test optic fibre length and fixes the optic fibre dead lever, the optic fibre dead lever is used for pasting fixed optic fibre that awaits measuring, the electronic scale is used for reading the horizontal tensile displacement data of continuous each point on the optic fibre, automatically controlled displacement platform is used for controlling the horizontal displacement of optic fibre dead lever.
Furthermore, the optical fiber fixing rod is provided with an axial guide groove, and the optical fiber to be detected is fixed in the axial guide groove in a sticking manner.
Furthermore, an electronic scale guide rail is further arranged on the optical fiber strain generation platform, and the electronic scale is connected with the electronic scale guide rail in a sliding mode.
Furthermore, the electronic scale moves parallel to the optical fiber fixing rod along the electronic scale guide rail, the distance between each continuous point on the optical fiber and the electronic scale guide rail is read along the moving direction, and the transverse stretching displacement data of each continuous point on the optical fiber is calculated according to the reading of the electronic scale when the optical fiber is not deformed and the reading of the electronic scale when the optical fiber is deformed in a certain transverse stretching mode.
Furthermore, an optical fiber guide rod is arranged on the electric control displacement platform and connected with the center of the optical fiber fixing rod, and the electric control displacement platform controls the quantitative transverse displacement of the optical fiber fixing rod by controlling the quantitative transverse movement of the optical fiber guide rod.
The invention also provides a method for calibrating the optical fiber strain and transverse deformation coefficient based on the BOTDR.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a calibration method for optical fiber strain and transverse deformation coefficient based on BOTDR comprises the optical fiber strain and transverse deformation coefficient calibration device based on BOTDR, and specifically comprises the following steps:
and 8, calibrating the strain and transverse deformation coefficients of the optical fiber according to the data obtained in the steps 1-7.
Further, in the step 7, the main control computer calibrates the optical fiber strain and the transverse deformation coefficient according to the optical fiber strain data under different transverse stretching conditions and the transverse stretching displacement data of the corresponding continuous points.
The third purpose of the invention is to provide a main control computer for calibrating the fiber strain and the transverse deformation coefficient of the BOTDR.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a main control computer for calibrating optical fiber strain and transverse deformation coefficient of BOTDR comprises a processor and a computer readable storage medium, wherein the processor is used for realizing each instruction; a computer readable storage medium for storing a plurality of instructions adapted to be loaded by a processor and to perform the process of:
controlling the electric control displacement table to enable the optical fiber fixing rod to generate quantitative transverse displacement;
controlling the electronic scale to move parallel to the optical fiber fixing rod and reading the distance between each continuous point on the optical fiber and the electronic scale guide rail;
controlling the BOTDR to perform optical fiber strain test and reading strain data;
repeating the above process for multiple times;
and calibrating the fiber strain and the transverse deformation coefficient according to the fiber strain data under different transverse stretching conditions and the transverse stretching displacement data of corresponding continuous points.
Furthermore, the main control computer also needs to measure the optical fiber strain data and the transverse tensile displacement data which are not deformed; and the main control computer calculates the transverse stretching displacement of each continuous point on the optical fiber according to the reading of the electronic scale when the optical fiber is not deformed and is deformed.
Compared with the prior art, the invention has the beneficial effects that:
1. the optical fiber transverse line stretching device can automatically and quantitatively transversely stretch the optical fiber and measure the transverse deformation of each continuous point on the optical fiber.
2. The master control computer controls the optical fiber strain distribution tester to measure the optical fiber strain, and automatically calculates and calibrates the optical fiber strain and the optical fiber transverse deformation coefficient.
3. The optical fiber strain and the optical fiber transverse deformation coefficient can be completed only by simply replacing optical fibers of different models and different specifications.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic view of an apparatus of the present invention;
the optical fiber strain measuring device comprises a main control computer 1, a BOTDR2, an optical fiber strain generating device 3, an optical fiber strain generating platform 4, an optical fiber fixing clamp 5, an optical fiber fixing rod 6, an optical fiber fixing rod 7, an electronic scale 8 and an electric control displacement platform.
Detailed Description
The invention is further described with reference to the following detailed description of embodiments and drawings.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
As introduced in the background art, the prior art has the problems that the relationship between the optical fiber strain and the optical fiber transverse tensile displacement cannot be accurately calibrated due to manual strain and point measurement, and in order to solve the technical problems, the application provides a device and a method for calibrating the optical fiber strain and transverse deformation coefficient based on the BOTDR, which can perform stress change on optical fibers of various types and specifications, can rapidly and accurately measure the transverse tensile displacement of the optical fibers, and can accurately calculate the transverse tensile displacement of various optical fibers and calibrate the optical fiber strain and the optical fiber transverse deformation coefficient based on the test result of an optical fiber strain distribution tester.
The invention aims to provide a calibration device for optical fiber strain and transverse deformation coefficients based on a BOTDR.
In order to achieve the purpose, the technical scheme of the invention is as follows:
as shown in fig. 1, a calibration device for fiber strain and transverse deformation coefficient based on BOTDR comprises a main control computer 1, a BOTDR2 and a fiber strain generating device 3, wherein the main control computer 1 is used for controlling a BOTDR2 to perform fiber strain test and read strain data, the main control computer 1 is used for controlling the fiber strain generating device 3 to perform quantitative and accurate transverse stretching on an optical fiber and obtain transverse stretching displacement data of each continuous point on the optical fiber, and the main control computer 1 calibrates fiber strain and transverse deformation coefficient according to fiber strain data of different transverse stretching conditions and transverse stretching displacement data of each corresponding continuous point.
Optical fiber strain generating device 3 includes that optic fibre meets an emergency and takes place platform 4, optic fibre meets an emergency and is equipped with optic fibre mounting fixture 5, optic fibre dead lever 6, electronic scale 7 and automatically controlled displacement platform 8 on taking place platform 4, optic fibre mounting fixture 5 is used for adjusting test optical fibre length and fixes optic fibre dead lever 6, optic fibre dead lever 6 is used for pasting fixed optic fibre that awaits measuring, electronic scale 7 is used for reading the horizontal tensile displacement data of continuous each point on the optic fibre, automatically controlled displacement platform 8 is used for controlling the horizontal displacement of optic fibre dead lever 6.
The optical fiber fixing rod 6 is provided with an axial guide groove, and the optical fiber to be detected is fixed in the axial guide groove by using quick-drying glue.
In specific implementation, the distance between the optical fiber fixing clamps 5 is 1 meter by adjusting the optical fiber fixing clamps 5, so that the length of the optical fiber is adjusted to be 1 meter.
The electronic scale 7 has a movement control function and a distance measurement function.
In specific implementation, an electronic scale guide rail is further arranged on the optical fiber strain generation platform 4, and the electronic scale 7 is connected with the electronic scale guide rail in a sliding mode. The electronic scale 7 moves parallel to the optical fiber fixing rod 6 along the electronic scale guide rail, the distance between each continuous point on the optical fiber and the electronic scale guide rail is read along the moving direction, and the main control computer 1 calculates the transverse stretching displacement data of each continuous point on the optical fiber according to the reading of the electronic scale 7 when the optical fiber is not deformed and the reading of the electronic scale 7 when the optical fiber is deformed in a certain transverse stretching mode.
The electric control displacement table 8 is provided with an optical fiber guide rod, the optical fiber guide rod is connected with the center of the optical fiber fixing rod 6, and the electric control displacement table 8 controls quantitative transverse displacement of the optical fiber fixing rod 6 by controlling quantitative transverse movement of the optical fiber guide rod.
The invention also provides a method for calibrating the optical fiber strain and transverse deformation coefficient based on the BOTDR.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a calibration method for optical fiber strain and transverse deformation coefficient based on BOTDR comprises the optical fiber strain and transverse deformation coefficient calibration device based on BOTDR, and specifically comprises the following steps:
and 8, calibrating the optical fiber strain and the transverse deformation coefficient according to the data read in the steps 1-7.
In the step 8, the main control computer 1 calibrates the optical fiber strain and the transverse deformation coefficient according to the optical fiber strain data under different transverse stretching conditions and the transverse stretching displacement data of the corresponding continuous points.
The third purpose of the invention is to provide a main control computer for calibrating the fiber strain and the transverse deformation coefficient of the BOTDR.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a main control computer for calibrating optical fiber strain and transverse deformation coefficient of BOTDR comprises a processor and a computer readable storage medium, wherein the processor is used for realizing each instruction; a computer readable storage medium for storing a plurality of instructions adapted to be loaded by a processor and to perform the process of:
controlling the electric control displacement table 8 to enable the optical fiber fixing rod 6 to generate quantitative transverse displacement;
controlling the electronic scale 7 to move parallel to the optical fiber fixing rod 6 and reading the distance between each continuous point on the optical fiber and the electronic scale guide rail;
controlling the BOTDR2 to perform optical fiber strain test and read strain data;
repeating the above process for multiple times;
and calibrating the fiber strain and the transverse deformation coefficient according to the fiber strain data under different transverse stretching conditions and the transverse stretching displacement data of corresponding continuous points.
The main control computer 1 also needs to measure the optical fiber strain data and the transverse tensile displacement data which are not deformed; and the main control computer 1 calculates the transverse stretching displacement of each continuous point on the optical fiber according to the reading of the electronic scale 7 when the optical fiber is not deformed and is deformed.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (9)
1. The utility model provides an optic fibre is met an emergency and horizontal deformation coefficient calibration device based on BOTDR which characterized in that: the optical fiber strain measurement system comprises a main control computer, a BOTDR and an optical fiber strain generating device, wherein the main control computer is used for controlling the BOTDR to perform optical fiber strain test and obtain strain data, the main control computer is used for controlling the optical fiber strain generating device to perform quantitative and accurate transverse stretching on an optical fiber and reading transverse stretching displacement data of each continuous point on the optical fiber, and the main control computer calibrates optical fiber strain and transverse deformation coefficients according to optical fiber strain data of different transverse stretching conditions and corresponding transverse stretching displacement data of each continuous point;
the optical fiber strain generating device comprises an optical fiber strain generating platform, wherein an optical fiber fixing clamp, an optical fiber fixing rod, an electronic scale and an electric control displacement platform are arranged on the optical fiber strain generating platform, the optical fiber fixing clamp is used for adjusting the length of a tested optical fiber and fixing the optical fiber fixing rod, the optical fiber fixing rod is used for pasting a fixed optical fiber to be tested, the electronic scale is used for reading transverse stretching displacement data of continuous points on the optical fiber, and the electric control displacement platform is used for controlling transverse displacement of the optical fiber fixing rod.
2. The BOTDR-based optical fiber strain and transverse deformation coefficient calibration device as claimed in claim 1, wherein the optical fiber fixing rod is provided with an axial guide groove, and the optical fiber to be tested is fixed in the axial guide groove in a sticking manner.
3. The BOTDR-based optical fiber strain and transverse deformation coefficient calibration device as claimed in claim 1, wherein an electronic scale guide rail is further arranged on the optical fiber strain generation platform, and the electronic scale is slidably connected with the electronic scale guide rail.
4. The BOTDR-based optical fiber strain and transverse deformation coefficient calibration device according to claim 3, wherein the electronic scale moves parallel to the optical fiber fixing rod along the electronic scale guide rail, the distance between each successive point on the optical fiber and the electronic scale guide rail is read along the moving direction, and transverse tension displacement data of each successive point on the optical fiber is calculated according to the reading of the electronic scale when the optical fiber is not deformed and the reading of the electronic scale when the optical fiber is subjected to certain transverse tension deformation.
5. The BOTDR-based optical fiber strain and transverse deformation coefficient calibration device of claim 1, wherein an optical fiber guide rod is arranged on the electrically controlled displacement stage, the optical fiber guide rod is connected with the center of the optical fiber fixing rod, and the electrically controlled displacement stage controls quantitative transverse displacement of the optical fiber fixing rod by controlling quantitative transverse movement of the optical fiber guide rod.
6. A calibration method for fiber strain and transverse deformation coefficient based on BOTDR is characterized by comprising the calibration device for fiber strain and transverse deformation coefficient based on BOTDR as claimed in any one of claims 3-4, and specifically comprises the following steps:
step 1, controlling an electronic scale to move parallel to an optical fiber fixing rod, and reading the distance between each continuous point on an undeformed optical fiber and an electronic scale guide rail;
step 2, controlling the BOTDR to perform optical fiber strain test and reading strain data;
step 3, controlling the electric control displacement table to enable the optical fiber fixing rod to generate quantitative transverse displacement;
step 4, controlling the electronic scale to move parallel to the optical fiber fixing rod, and reading the distance between each continuous point on the deformed optical fiber and the electronic scale guide rail;
step 5, calculating the transverse stretching displacement data of each continuous point on the optical fiber according to the reading of the electronic scale in the step 1 and the step 4;
step 6, controlling the BOTDR to perform optical fiber strain test and reading strain data;
step 7, repeating the steps 3-6;
and 8, calibrating the strain and transverse deformation coefficients of the optical fiber according to the data obtained in the steps 1-7.
7. The BOTDR-based optical fiber strain and transverse deformation coefficient calibration method according to claim 6, wherein in step 8, the main control computer calibrates the optical fiber strain and the transverse deformation coefficient according to the optical fiber strain data under different transverse stretching conditions and the transverse stretching displacement data of corresponding consecutive points.
8. A main control computer for calibrating optical fiber strain and transverse deformation coefficient of BOTDR is used for controlling an optical fiber strain generation platform; the optical fiber strain generating platform is provided with an optical fiber fixing clamp, an optical fiber fixing rod, an electronic scale and an electric control displacement platform, the optical fiber fixing clamp is used for adjusting the length of a tested optical fiber and fixing the optical fiber fixing rod, the optical fiber fixing rod is used for fixedly sticking an optical fiber to be tested, the electric control displacement platform is provided with an optical fiber guide rod, the optical fiber guide rod is connected with the center of the optical fiber fixing rod, the optical fiber strain generating platform is also provided with an electronic scale guide rail, and the electronic scale is connected with the electronic scale guide rail in a;
it is characterized in that the preparation method is characterized in that,
the system comprises a processor and a computer readable storage medium, wherein the processor is used for realizing instructions; a computer readable storage medium for storing a plurality of instructions adapted to be loaded by a processor and to perform the process of:
controlling the electric control displacement table to enable the optical fiber fixing rod to generate quantitative transverse displacement;
controlling the electronic scale to move parallel to the optical fiber fixing rod and reading the distance between each continuous point on the optical fiber and the electronic scale guide rail;
controlling the BOTDR to perform optical fiber strain test and reading strain data;
repeating the above process for multiple times;
and calibrating the fiber strain and the transverse deformation coefficient according to the fiber strain data under different transverse stretching conditions and the transverse stretching displacement data of corresponding continuous points.
9. The master control computer for fiber strain and transverse deformation coefficient calibration of a BOTDR of claim 8, wherein said master control computer further needs to measure undeformed fiber strain data and transverse tensile displacement data; and the main control computer calculates the transverse stretching displacement of each continuous point on the optical fiber according to the reading of the electronic scale when the optical fiber is not deformed and is deformed.
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| CN103335603B (en) * | 2013-06-27 | 2016-03-16 | 中国电子科技集团公司第四十一研究所 | A kind of distributive fiber optic strain factor calibration device and scaling method |
| CN203534614U (en) * | 2013-08-06 | 2014-04-09 | 神华集团有限责任公司 | Position calibration device used for distributed optical fiber sensing system |
| JP6259342B2 (en) * | 2014-03-31 | 2018-01-10 | 株式会社熊谷組 | Optical fiber sensor |
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