CN112066904A - Distributed optical fiber strain sensing calibration system and method - Google Patents
Distributed optical fiber strain sensing calibration system and method Download PDFInfo
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- CN112066904A CN112066904A CN202011064710.2A CN202011064710A CN112066904A CN 112066904 A CN112066904 A CN 112066904A CN 202011064710 A CN202011064710 A CN 202011064710A CN 112066904 A CN112066904 A CN 112066904A
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- 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
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Abstract
The application provides a distributed optical fiber strain sensing calibration system and a method, wherein the system comprises a base, a slide rail, a slide block, a transmission seat, a power device, an optical fiber fixing end, a displacement transmission device and a measuring device; the strain value of the distributed optical fiber sensing system is obtained by setting the optical fiber fixing end and the sliding block to stretch the optical fiber or the optical cable and dividing the stretching variable quantity by the mapping distance.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to a distributed optical fiber strain sensing calibration system and method.
Background
The optical fiber sensing mechanism is that light beam from light source is transmitted via optical fiber to the sensing front end and interacted with the measured outside parameters to change the optical properties of light in the sensing front end, such as light strength, wavelength, frequency, phase, polarization state, etc. into modulated light signal, which is transmitted via optical fiber to the photoelectronic device and demodulated to obtain the measured parameters.
Fiber optic sensing has many excellent properties, such as: the material has the performance of resisting electromagnetic and atomic radiation interference, and has the mechanical properties of thin diameter, soft quality and light weight; insulating, non-inductive electrical performance; chemical properties of water resistance, high temperature resistance and corrosion resistance; sensing performances of various physical quantities such as temperature, strain, displacement, vibration, sound wave, radiation and the like; the optical loss is small, the integration is easy, the engineering applicability is good in long distance, and the like, and the optical fiber can play a role in real-time sensing and monitoring in places where people cannot reach (such as high-temperature regions) or places harmful to people (such as nuclear radiation regions and hazardous chemical places).
Distributed optical fiber sensing is a technique for measuring by using the one-dimensional spatial continuity of an optical fiber, continuously measuring environmental parameters distributed along the optical fiber in the length direction of the optical fiber, and acquiring information of the measured spatial distribution state and time variation. The existing distributed optical fiber sensing technology with mature technology mainly comprises an OTDR (optical time domain reflectometer), a BOTDA (Brillouin optical time domain analysis), a BOTDR (Brillouin time domain reflection), a DTS (distributed optical fiber Raman temperature sensing), a sagnac (sagnac interferometer), a michelson (Michelson interferometer), an OFDR, a phi-OTDR (phase optical time domain reflectometer), a COTDR (coherent optical time domain reflectometer), an FBG, a P-OTDR (polarized optical time domain reflectometer), a DVS (distributed optical fiber vibration sensing), a DAS (distributed optical fiber sound sensing) and the like, and can be used for sensing information such as optical loss, temperature, strain, vibration, direction, sound and the like of several kilometers or even hundreds of kilometers. However, as distributed optical fiber sensing is a new technology developed in recent years, the productization and engineering applicability of distributed optical fiber sensing still need to be solved.
The optical fiber sensing technology is a hot spot technology for over ten years, is rapidly developed in industries such as petroleum and petrochemical industry, civil construction, aerospace, transportation, military industry, electric power, fire protection, security protection, medical treatment and the like, and is applied to a plurality of ground technology. The optical fiber sensing products with different light sensation principles are numerous, optical fiber sensing instruments and equipment are basically mature, but the development of optical fiber sensing is far from meeting the market demand, which is mainly reflected in that (1) the sensing for sensing physical quantity is single and cannot meet the wide demand of the industry; (2) the industrial applicability of sensing is poor, and special sensing needs to be customized and developed by matching with the characteristics of various industries; (3) the sensing single sensing capability under the condition of multi-physical field coupling is poor, and the sensing physical field decoupling technology needs to be solved; (4) the packaging process of the optical fiber sensing is lack of reliability, and a new technology, a new process and a new material are needed to solve the problem; (5) the calibration detection equipment of the optical fiber sensing is deficient and the technology is immature, and the key indexes such as sensing precision and the like are seriously restricted.
For example, the closest technical solution in the prior art to the present invention is: ' optical fiber strain and temperature simultaneous calibration device and method based on Brillouin scattering, authorization number: CN 103115642B ", the patent technology of the invention: the invention belongs to the technical field of distributed optical fiber sensing measurement, and particularly relates to a device and a method for simultaneously calibrating optical fiber strain and temperature based on Brillouin scattering. The device comprises optical fiber Brillouin sensor measuring equipment, a shockproof support, a metal tube and constant temperature equipment, wherein the strain calibration device is manufactured by using the metal tube with a large and stable linear expansion coefficient, and the position of an optical fiber is accurately controlled by writing threads on the outer wall of the metal tube; the simultaneous calibration of temperature and strain is carried out by utilizing the characteristics that the optical fiber on the metal tube bears strain and temperature at the same time and the loose optical fiber only bears temperature; applying precisely controllable strain and temperature to the optical fiber and the relaxed optical fiber on the metal tube by using thermostatic equipment; calibrating the strain and temperature coefficient of the optical fiber through a detailed calibration step; according to the invention, by designing the strain and temperature high-precision simultaneous calibration device and method of the optical fiber Brillouin sensor, the problems of large strain calibration error and low strain and temperature calibration efficiency are solved.
The technology can be used for temperature and strain calibration detection of the distributed optical fiber, but the technology adopts the method of accurately controlling the position of the optical fiber by engraving threads on the metal tube, the processing technology has high difficulty, and the winding of the optical fiber is difficult and time-consuming during calibration test; the technology adopts the linear expansion coefficient of a metal pipe to calibrate the strain and the temperature of the optical fiber, the control difficulty of micro strain generated by linear expansion is high, and the strain precision cannot be ensured; the metal tube adopted by the technology is heated to expand, the strain of the optical fiber on the surface of the metal tube is related to the temperature of the metal tube and the expansion of the metal tube, and the decoupling precision of the metal tube and the optical fiber is limited. The technology is used for the calibration test of distributed optical fiber strain sensing and can not be realized: the method is not beneficial to improving the industrial mass production efficiency, and is not suitable for calibration tests of distributed optical fiber sensing of different specifications and models and spatial resolution and sensing optical cables.
Disclosure of Invention
Based on the above problems, an object of the present application is to provide a distributed optical fiber strain sensing calibration system and method, which can obtain a strain value more intuitively and accurately, improve the accuracy of the strain precision, sensitivity, measurement range, and the like of the optical fiber strain sensing delivery and installation construction, and ensure excellent engineering application effect.
An embodiment of one aspect of the present invention provides a distributed optical fiber strain sensing calibration system, including: the device comprises a base, a slide rail, a sliding block, a transmission seat, a power device, a displacement transmission device and a measuring device; the base is fixedly provided with a sliding rail and a transmission seat, one end of the sliding rail is provided with a sliding block which can move along the sliding rail, the sliding block clamps one end of the optical fiber to be detected, the other end of the optical fiber to be detected is clamped at an optical fiber fixing end, and the optical fiber fixing end is arranged on a movable firm structure; the utility model discloses a fiber optic cable measuring device, including optical fiber to be measured, power device and displacement transmission device, the distribution is equipped with a plurality of optical fiber strain sensor on the optical fiber to be measured, be equipped with a plurality of movable brackets between optical fiber stiff end and the base, the movable bracket is used for supporting the optical fiber to be measured, the sliding block is connected with displacement transmission device, power device and displacement transmission device pass through transmission seat fixed connection, measuring device installs the strain value that is used for measuring the optical fiber to be measured on the.
Preferably, the two ends of the optical fiber to be detected are respectively connected with the optical fiber fixing end and the sliding block by adopting a blocking or winding structure around the barrel.
In any of the above embodiments, preferably, the movable support is provided with a fixed pulley.
Preferably, in any one of the above embodiments, the power device is a handwheel or a stepping motor; and the power output end of the power device is connected with the displacement transmission device through the transmission seat.
Preferably, in any one of the above embodiments, the measuring device is disposed in parallel on one side of the sliding rail, and one end of the measuring device is aligned with an initial position of the sliding block, so as to measure a displacement distance of the sliding block after the force is applied; the measuring device adopts any one of the following tools: a dial gauge, a dial indicator, a caliper and a depth gauge.
In any one of the above embodiments, preferably, the measuring device employs a displacement sensor, the displacement sensor is connected to an input end of a microcontroller, and an output end of the microcontroller is connected to a power device.
In any of the above embodiments, preferably, the displacement transmission device is a self-locking screw rotation mechanism.
The invention also provides a distributed optical fiber strain sensing calibration method, which is applied to the calibration device and comprises the following steps:
s1, clamping the optical fiber to be measured between the optical fiber fixing end and the sliding block, and measuring the gauge length of the optical fiber to be measured;
s2, starting a power device, driving a displacement transmission device to act by using the power device, displacing a sliding block, deforming the optical fiber to be measured, and measuring and recording the deformation quantity of the optical fiber to be measured by using a measuring device;
and S3, repeating the steps S1-S2, calculating calibration parameters according to the deformation quantity and the scale distance measured for many times, and completing calibration.
Preferably, in S3, the calibration parameters include one or more of the following parameters: strain sensitivity, accuracy and measurement range.
Further, when the strain sensitivity is calculated, linear fitting calculation is performed by taking a plurality of strain deformation quantities obtained through multiple measurements as a horizontal axis and the corresponding optical information of the optical fiber to be measured as a vertical axis to obtain a slope value, so that the strain sensitivity of the optical fiber to be measured is obtained.
Compared with the prior art, the distributed optical fiber strain sensing calibration system and method provided by the invention at least have the following advantages:
the utility model provides a calibration system, adopt the form of optic fibre stiff end and sliding block, carry out the centre gripping to the optic fibre that awaits measuring, support the back through the support, avoid optic fibre or optical cable to take place gravity flagging, start power device, it stretches to await measuring optic fibre to drive displacement transmission by power device, utilize the deformation volume after measuring device measurement is stretched, compare the form of carving the screw thread on the tubular metal resonator, this system is convenient to be measured, easy to process, system overall stability is higher, on the other hand, with optic fibre stiff end direct mount on the firm structure thing that can move, can adapt to the gauge length of different specification sensors in the engineering is used, improve the commonality of this equipment to different gauge length sensors.
According to the calibration method, the optical fiber to be measured is stretched, the stretching variable quantity of the optical fiber to be measured is divided by the mapping distance, and therefore the strain value of the distributed optical fiber can be obtained.
The utility model provides an optic fibre stiff end and sliding block adopt detachable optic fibre or optical cable card hinder or wind bucket winding fixed mode, consequently make things convenient for the change of the optic fibre or the optical cable of different specifications and length, do benefit to batchization, customization and mark the test to easy and simple to handle. The optical fiber strain detector can avoid the phenomenon that the surface of the optical fiber to be measured cannot generate relative displacement when the optical fiber to be measured generates strain, and the measurement result is more accurate.
The displacement transmission device adopts the screw rod rotating mechanism, and the stability of the displacement transmission device is ensured by utilizing the self-locking function of the screw rod rotating mechanism, so that the strain calibration precision of the measured optical fiber strain sensor is ensured.
The movable support and the optical fiber or the optical cable contact mode adopt the fixed pulley, and the measurement of the excessive influence of the friction force is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
figure 1 is a schematic diagram of a distributed optical fiber strain sensing calibration system according to an aspect,
FIG. 2 is a schematic side view of a distributed optical fiber strain sensing calibration system according to an aspect;
FIG. 3 is a schematic diagram of strain calibration of a distributed optical fiber strain sensing calibration system according to an embodiment of an aspect;
FIG. 4 is a block diagram of a connection structure of a distributed optical fiber strain sensing calibration system according to an embodiment of an aspect;
FIG. 5 is a flow chart of a distributed optical fiber strain sensing calibration method according to an aspect;
in the figure: 1. a base; 2. a slide rail; 3. a slider; 4. a transmission seat; 5. a displacement transmission device; 6. a measuring device; 7. a power plant; 8. a movable support; 9. an optical fiber fixing end; 10. an optical fiber to be tested; 11. display screen
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
As shown in fig. 1-2, an embodiment of an aspect of the present invention is a distributed optical fiber strain sensing calibration system, including: the device comprises a base 1, a slide rail 2, a slide block 3, a transmission seat 4, a power device 7, a displacement transmission device 5 and a measuring device 6; the optical fiber measuring device is characterized in that a sliding rail 2 and a transmission seat 4 are fixedly installed on the base 1, one end of the sliding rail 2 is provided with a sliding block 3 capable of moving along the sliding rail 2, the sliding block 3 clamps one end of an optical fiber 10 to be measured, the other end of the optical fiber 10 to be measured is clamped at an optical fiber fixing end 9, the optical fiber fixing end 9 is directly installed on a movable firm structure, a plurality of movable supports 8 are arranged between the optical fiber fixing end 9 and the base 1, the movable supports 8 are used for supporting the optical fiber 10 to be measured, the sliding block 3 is connected with a displacement transmission device 5, the power device 7 is fixedly connected with the displacement transmission device 5 through the transmission seat 4, and the measuring device 6 is installed on the base 1 and used for measuring the strain value of.
As will be described later on in the specific implementation process of this embodiment, one end of the optical fiber to be measured is fixed on the optical fiber fixing end 9, and the other end is fixed on the sliding block, and the initial length of the optical fiber to be measured is recorded, and after applying a force to the power device 7, the force is converted into rotation of the displacement transmission device 7 through the transmission seat 4, and after the displacement transmission device 5 acts, the sliding block 3 is driven to generate linear displacement in the direction of the guide rail 2, so that the optical fiber or optical cable 10 held on the sliding block 3 is stretched or compressed.
It should be noted that the rigidity of the base 1 and the slide rail 2, the fixing force of the optical fiber fixing end 9 and the base 1, the fixing force of the optical fiber fixing end 9 and the slide block 3 with the optical fiber or the optical cable 10, the rigidity of the displacement transmission device 5, the power device 7 and the transmission seat 4, and the like are all required to be sufficiently larger than the force corresponding to the maximum strain value of the calibrated optical fiber strain sensor, and are in principle 10 times or more.
As shown in fig. 3, in this embodiment, the initial gauge length and the deformation amount after the application of force measured by the measuring device 6 are calculated as follows, the displacement variation D of the tension or compression is divided by the length C of the optical fiber or the optical cable 10 between the optical fiber fixed end 9 and the slider 3 to obtain the strain variation value of the distributed optical fiber strain sensing, a plurality of strain variation values are taken as the horizontal axis, the corresponding optical fiber strain sensing optical information is taken as the vertical axis, and linear fitting calculation is performed to obtain the slope value, that is, the strain sensitivity of the distributed optical fiber strain sensing product can be obtained, and the strain measurement range, the precision and other index information of the distributed optical fiber strain sensing product can be obtained according to the sensing calibration method.
It should be noted that the measuring device 6 is arranged in parallel on one side of the slide rail 2, and one end of the measuring device 6 is aligned with the initial position of the slide block 3 and is used for measuring the displacement distance of the slide block 3 after force application; the measuring device 6 adopts any one of the following tools: micrometer, dial indicator, caliper, depth gauge. The device can be replaced according to the length of the mapping distance and the requirement of sensing calibration precision, a dial gauge can be adopted for high precision and short mapping distance, a caliper or a depth gauge can be adopted for low precision and long mapping distance, and therefore the device has a wider application range of calibration test products.
In order to avoid the optical fiber to be detected, the two ends of the optical fiber to be detected 10 are respectively connected with the optical fiber fixing end 9 and the sliding block 3 by adopting a blocking or barrel winding structure. Therefore, the replacement of optical fibers or optical cables with different specifications and lengths is convenient, batch and customized calibration tests are facilitated, and the operation is simple and convenient; furthermore, the optical fiber fixing end 9 is directly installed on a movable firm structure, the distance between the optical fiber fixing end 9 and the sliding block 3 determines the mapping distance C of the distributed optical fiber strain, and the mapping distance C is generally longer than the spatial resolution of the distributed optical fiber strain sensing system, so that the optical fiber fixing end 9 can change the position of the optical fiber fixing end from the sliding block 3 by moving, and the universality of the device on the distributed optical fiber sensing systems with different mapping distances is improved; because the fixed position of the optical fiber fixed end 9 can be moved, the device is suitable for the calibration test of the distributed optical fiber sensing system with various measuring distance specifications, is beneficial to the management of the model specifications of enterprise products, and reduces the investment of fixed assets.
Be equipped with a plurality of movable support 8 between optic fibre stiff end 9 and the base 1, movable support 8 is used for supporting the optic fibre 10 that awaits measuring, be equipped with the fixed pulley on the movable support 8. Further, the slide rail 2 in this embodiment may adopt a mechanical structure such as a rail-type slide bar or a slide rail, and ensures that the axial movement of the structure is excellent and the axial movement deviation is small.
In another embodiment of the invention, the displacement transmission 5 is a self-locking screw rotation mechanism. Because the device adopts a structure with rigidity far larger than the strain maximum force of the optical fiber or the optical cable, and only the displacement transmission device 5 and the sliding block 3 are movable parts in the structure and are in hard connection, the structure can ensure the strain calibration precision of the whole device as long as the stability of the displacement transmission device is ensured, and the current displacement transmission device based on the screw rod rotating mechanism has higher stability (the current micrometer caliper adopts the mechanism and has a self-locking function, so the device completely meets the strain calibration detection requirement of the optical fiber or the optical cable structurally.
It should be noted that, in the implementation process, it is to be ensured that the sensor fixing direction of the optical fiber fixing end and the sliding block and the force application direction of the strain calibration device are in the same axial framework, so as to prevent the occurrence of shear force in the sensor calibration process and only allow the occurrence of tensile and compressive forces; in order to ensure the force application balance, the power device 7 is a rotary force application structure. The rotary force application structure is a hand wheel or a stepping motor. And the power output end of the power device 7 is connected with the displacement transmission device 5 through the transmission seat 4.
In another embodiment of the present application, as shown in fig. 4, the measuring device 6 is a displacement sensor, which is connected to the input of a microcontroller, the output of which is connected to the power device 7. Displacement sensor sets up to two, and one is used for detecting before the power device application of force, the distance between optic fibre stiff end and the sliding block, and another displacement sensor is used for detecting, and the application of force begins the back, and the distance that the sliding block removed, two displacement sensor connect microcontroller's input respectively, power device 7 and display screen 11 are connected to microcontroller's output. It should be noted that the microcontroller is a small-sized single chip microcomputer, the input end of the microcontroller is provided with an AD acquisition circuit, the AD acquisition circuit is used for performing digital conversion on analog data acquired by the displacement sensor, the converted digital data is sent to the display screen to be displayed, a tested numerical value can be seen through the display screen, and the single chip microcomputer triggers and generates a control command after acquiring sensor data to control the power device 7. And the lower command is sent to the power device 7 (adopting a stepping motor) to perform the next action, and the data after each action is calculated to obtain a strain value, so that the strain calibration test efficiency of the optical fiber sensor can be improved, and the intellectualization of test calibration is realized.
As shown in fig. 5, the present invention further provides a distributed optical fiber strain sensing calibration method, which is applied to the calibration device, and includes the following steps:
s1, clamping the optical fiber 10 to be measured between the optical fiber fixing end 9 and the sliding block 3, and measuring the gauge length of the optical fiber 10 to be measured;
s2, starting the power device 7, driving the displacement transmission device 5 to act by using the power device 7, so that the sliding block 3 is displaced, the strain sensor of the optical fiber 10 to be measured is deformed, and the deformation quantity of the optical fiber 10 to be measured is measured and recorded by using the measuring device 6;
and S3, repeating the step S2, calculating calibration parameters according to the deformation quantity and the scale distance measured for many times, and completing calibration.
Preferably, in S3, the calibration parameters include one or more of the following parameters: strain sensitivity, accuracy, measurement range.
Further, when the strain sensitivity is calculated, linear fitting calculation is performed by taking a plurality of strain deformation quantities obtained through multiple measurements as a horizontal axis and the corresponding optical information of the optical fiber 10 strain sensor to be measured as a vertical axis to obtain a slope value, so that the strain sensitivity of the optical fiber 10 strain sensor to be measured is obtained.
It should be noted that, since the method provided by the present application is directed to testing an optical fiber strain sensor, when an optical fiber is subjected to a tensile change during testing, the length of an optical fiber sensing unit changes, so that optical information including the phase, intensity, wavelength, and the like of light changes, and the changed optical information is taken as a vertical axis, that is, linear fitting can be achieved, and linear sensitivity can be calculated.
The invention provides a distributed optical fiber strain sensing calibration system and a distributed optical fiber strain sensing calibration method, wherein firstly, the optical fiber fixing end 9 and the sliding block 3 are adopted to clamp an optical fiber 10 to be tested, compared with the form of carving threads on a metal pipe, the processing is easy, the detection precision is high, and the optical fiber fixing end 9 and the sliding block 3 adopt a detachable optical fiber or optical cable blocking or winding and fixing mode around a barrel, so that the replacement of optical fibers or optical cables with different specifications and lengths is convenient, the batch and customized calibration test is facilitated, and the operation is simple and convenient. The surface of the optical fiber 10 to be measured does not generate relative displacement when the strain sensor generates strain, and the measurement result is more accurate.
Because the distance between the optical fiber fixed end 9 and the sliding block 3 determines the gauge length of the optical fiber strain sensor, the optical fiber fixed end 9 is directly arranged on a movable firm structure (a support rod with a weighting base, a support with a stable base and the like), the gauge length of the sensor with different specifications in engineering application can be adapted, and the universality of the device on different gauge length sensors is improved.
The displacement transmission device 5 adopts a screw rod rotating mechanism, and the self-locking function of the screw rod rotating mechanism is utilized to ensure the stability of the displacement transmission device 5 and the strain calibration precision of the measured optical fiber strain sensor.
Through setting up movable support 8, support optic fibre or optical cable and can not take place gravity flagging, movable support 8 and optic fibre or optical cable contact mode adopt the fixed pulley, avoid the too big influence of frictional force to measure.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (10)
1. A distributed optical fiber strain sensing calibration system is characterized by comprising a base (1), a slide rail (2), a sliding block (3), a transmission seat (4), a power device (7), a displacement transmission device (5) and a measuring device (6);
a sliding rail (2) and a transmission seat (4) are fixedly installed on the base (1), a sliding block (3) capable of moving along the sliding rail (2) is arranged at one end of the sliding rail (2), the sliding block (3) clamps one end of an optical fiber (10) to be detected, the other end of the optical fiber (10) to be detected is arranged at an optical fiber fixing end (9), and the optical fiber fixing end (9) is installed on a movable firm structure; be equipped with a plurality of movable support (8) between optic fibre stiff end (9) and base (1), movable support (8) are used for supporting optic fibre (10) that await measuring, sliding block (3) are connected with displacement transmission (5), displacement transmission (5) and power device (7) are through driving seat (4) fixed connection, measuring device (6) are installed and are used for measuring the strain value of optic fibre (10) that await measuring on base (1).
2. The calibration system according to claim 1, wherein the two ends of the optical fiber (10) to be measured are respectively connected to the optical fiber fixing end (9) and the sliding block (3) by adopting a blocking or barrel winding structure.
3. Calibration system according to claim 1, wherein the movable support (8) is provided with a fixed pulley.
4. Calibration system according to claim 1, wherein the power device (7) is a hand wheel or a stepper motor; and the power output end of the power device (7) is connected with the displacement transmission device (5) through the transmission seat (4).
5. The calibration system according to claim 1, wherein the measuring device (6) is arranged in parallel on one side of the slide rail (2), and one end of the measuring device (6) is aligned with the initial position of the slide block (3) for measuring the displacement distance of the slide block (3) after the force is applied; the measuring device (6) adopts any one of the following tools: a dial gauge, a dial indicator, a caliper and a depth gauge.
6. The calibration system according to claim 1, wherein the measuring device (6) is a displacement sensor, the displacement sensor is connected with an input end of a microcontroller, and an output end of the microcontroller is connected with a power device (7).
7. Calibration system according to claim 1, wherein the displacement transmission means (5) employs a self-locking screw rotation mechanism.
8. A distributed optical fiber strain sensing calibration method, applied to the calibration device of any one of claims 1 to 7, comprising the following steps:
s1, clamping the optical fiber to be measured between the optical fiber fixing end and the sliding block, and measuring the gauge length of the optical fiber to be measured;
s2, starting a power device, driving a displacement transmission device to act by using the power device, displacing a sliding block, deforming the optical fiber to be measured, and measuring and recording the deformation quantity of the optical fiber to be measured by using a measuring device;
and S3, repeating the step S2, calculating calibration parameters according to the deformation quantity and the scale distance measured for many times, and completing calibration.
9. The calibration method according to claim 8, wherein in S3, the calibration parameters include one or more of the following parameters: strain sensitivity, accuracy and measurement range.
10. The calibration method according to claim 9, wherein when calculating the strain sensitivity, linear fitting calculation is performed to obtain a slope value by using a plurality of strain deformation amounts obtained by multiple measurements as a horizontal axis and corresponding optical information of the optical fiber to be measured as a vertical axis, so as to obtain the strain sensitivity of the optical fiber to be measured.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112880629A (en) * | 2021-01-14 | 2021-06-01 | 中国计量科学研究院 | Strain sensor calibration device and calibration method |
| CN115060187A (en) * | 2022-08-18 | 2022-09-16 | 天津市计量监督检测科学研究院 | Distributed optical fiber strain sensing performance detection system and method |
| CN116379950A (en) * | 2023-03-03 | 2023-07-04 | 成都陆迪盛华科技有限公司 | Test method for strain calibration of distributed optical fiber structure for tunnel engineering monitoring |
| CN116379950B (en) * | 2023-03-03 | 2024-06-11 | 成都陆迪盛华科技有限公司 | Test method for strain calibration of distributed optical fiber structure for tunnel engineering monitoring |
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| CN115060187A (en) * | 2022-08-18 | 2022-09-16 | 天津市计量监督检测科学研究院 | Distributed optical fiber strain sensing performance detection system and method |
| CN115060187B (en) * | 2022-08-18 | 2022-12-02 | 天津市计量监督检测科学研究院 | Distributed optical fiber strain sensing performance detection system and method |
| CN116379950A (en) * | 2023-03-03 | 2023-07-04 | 成都陆迪盛华科技有限公司 | Test method for strain calibration of distributed optical fiber structure for tunnel engineering monitoring |
| CN116379950B (en) * | 2023-03-03 | 2024-06-11 | 成都陆迪盛华科技有限公司 | Test method for strain calibration of distributed optical fiber structure for tunnel engineering monitoring |
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