CN113587836A - In-situ calibration method for fiber grating strain sensor - Google Patents
In-situ calibration method for fiber grating strain sensor Download PDFInfo
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- CN113587836A CN113587836A CN202110868435.8A CN202110868435A CN113587836A CN 113587836 A CN113587836 A CN 113587836A CN 202110868435 A CN202110868435 A CN 202110868435A CN 113587836 A CN113587836 A CN 113587836A
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- 239000000835 fiber Substances 0.000 title claims abstract description 82
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000035945 sensitivity Effects 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 6
- 239000013307 optical fiber Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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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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Abstract
The invention belongs to the technical field of testing and calibration, and relates to an in-situ calibration method of a fiber grating strain sensor. The method is realized based on an in-situ calibration device of the fiber grating strain sensor, and the in-situ calibration device of the fiber grating strain sensor comprises a standard resistance strain gauge, the fiber grating strain sensor, a fiber grating demodulator, a resistance strain gauge and an upper computer. The in-situ calibration method for the fiber grating strain sensor provided by the invention solves the problems of data offset and inaccuracy of the fiber grating strain sensor, can be used for calibrating the conventional fiber grating strain sensor on the premise of not disassembling the conventional fiber grating strain sensor on the spot, and has the advantages of high precision, simplicity, quickness and the like.
Description
Technical Field
The invention belongs to the technical field of testing and calibration, and relates to an in-situ calibration method of a fiber grating strain sensor.
Background
The fiber grating strain sensor has the outstanding advantages of small volume, high sensitivity, electromagnetic interference resistance, light weight, distributable measurement and the like. The fiber grating strain sensor has the advantages of stable signal, realization of absolute measurement, capability of forming a sensing network by multipoint serial connection and the like on the basis of keeping the advantages of a common fiber sensor. With the application of structural health monitoring in bridges and large civil structures, fiber grating strain sensors are required in more and more engineering applications. After the fiber grating strain sensor is used for a period of time, the sensitivity of the fiber grating strain sensor can be changed, so that the accuracy of monitoring data is influenced, and therefore, the in-situ calibration of the fiber grating strain sensor becomes important.
The invention discloses an online calibration device and method for a fiber grating strain sensor, and the device is characterized in that a laser scanner vibration test analysis system is used for controlling the angle of a laser beam emitted by a laser lens, so that the laser beam is perpendicular to the middle point of the fiber grating strain sensor, and when the laser beam irradiates four rectangular boundary lines simulating a board to be measured, the included angle between the laser beam and the vertical direction is not more than 20 degrees. However, this method is complicated, is easily affected by the stability of the laser, and has a limitation in practical use because the installation position of the laser scanner system is required to be high.
Disclosure of Invention
The purpose of the invention is as follows: the method for calibrating the fiber bragg grating strain sensor in situ under the condition of no disassembly has the advantages of high precision, simplicity, rapidness and the like.
The invention is realized by the following technical scheme: an in-situ calibration method of a fiber grating strain sensor is realized based on an in-situ calibration device of the fiber grating strain sensor, wherein the in-situ calibration device of the fiber grating strain sensor comprises the fiber grating strain sensor, a standard resistance strain gauge, a fiber grating demodulator, a resistance strain gauge and an upper computer; the fiber grating strain sensor is connected with a fiber grating demodulator, and the fiber grating demodulator is connected with an upper computer; and connecting the standard resistance strain gauge with a resistance strain gauge, and connecting the resistance strain gauge with an upper computer. Taking a bridge as an example, when a load automobile acts on the bridge, the load is transmitted to a grating area of an optical fiber from a structure to cause the grating pitch of the grating to change, so that the reflection wavelength of the optical fiber grating changes, an optical fiber grating demodulator demodulates an optical signal with the reflection wavelength to obtain a change value of the central wavelength of the reflected light, the change value of the central wavelength of the reflected light is transmitted to an upper computer, and the upper computer displays and records the change condition of the central wavelength of the reflected light, so that the actual wavelength change value of the optical fiber grating strain sensor is obtained; and simultaneously, the upper computer displays and records the actual strain value of the standard resistance strain gauge, and the calibration of the fiber grating strain sensor can be completed by comparing the actual wavelength change value of the fiber grating strain sensor with the actual strain value of the standard resistance strain gauge.
The invention discloses an in-situ calibration method of a fiber grating strain sensor, which comprises the following specific steps:
the method comprises the following steps: providing a standard resistance strain gauge;
step two: sticking a standard resistance strain gauge beside the fiber bragg grating strain sensor;
step three: connecting a standard resistance strain gauge with a resistance strain gauge, and connecting the resistance strain gauge with a computer; connecting the fiber bragg grating strain sensor with a fiber bragg grating demodulator, and connecting the fiber bragg grating demodulator with a computer;
step four: before a loaded automobile passes through a bridge, reading an initial value of a fiber bragg grating strain sensor, and zeroing a resistance strain gauge;
step five: the loaded automobile is stopped for a period of time when reaching the position above the pasting position of the fiber grating strain sensor through the bridge, and after reaching a stable state, the wavelength change value A lambda of the fiber grating strain sensor is read1And strain value delta epsilon of standard resistance strain gauge1；
Step six: repeating the fourth step to the fifth step for 6 times;
step seven: calculating to obtain the strain average value of the standard resistance strain gauge
And wavelength average of fiber grating strain sensor
Step eight: changing the weight of the loaded automobile, and repeating the fourth step to the seventh step to obtain the standardSampled average of resistance strain gauges
And the sampling average value of the fiber grating strain sensor
Step nine: calculating sensitivity coefficient of fiber grating strain sensor
And completing in-situ calibration.
The principle adopted by the steps is as follows:
the wavelength and the strain of the fiber grating strain sensor are theoretically linear, and the test results of two times can be expressed as:
where a is a constant representing the inherent bias of each test. Because the weight of the loaded automobile is different in the two tests, the strain is different, and the difference between the two formulas is obtained:
thus, the strain sensitivity coefficient of the fiber bragg grating strain sensor is obtained
The invention has the beneficial effects that:
the invention provides an in-situ calibration method of a fiber grating strain sensor, which solves the problems of data offset and inaccuracy of the fiber grating strain sensor, can calibrate the conventional fiber grating strain sensor on the premise of not disassembling the conventional fiber grating strain sensor on the spot, and has the advantages of high precision, simplicity, quickness and the like.
Drawings
Fig. 1 is a schematic view of a load-bearing vehicle before it passes through a bridge.
Fig. 2 is a schematic view of a loaded car passing through a bridge.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic view of a load-bearing automobile before passing through a bridge. The device comprises a bridge 1, a load automobile 2, a standard resistance strain gauge 3, a fiber grating strain sensor 4, a fiber grating demodulator 5, a resistance strain gauge 6 and an upper computer 7; the standard resistance strain gauge 3 is attached beside the fiber grating strain sensor 4, a lead of the standard resistance strain gauge 3 is connected to the resistance strain gauge 6, the fiber grating strain sensor 4 is connected to the fiber grating demodulator 5, an initial value of the fiber grating strain sensor 4 is read before the load automobile 2 passes through the bridge 1, and the resistance strain gauge 6 is reset to zero;
fig. 2 is a schematic view of a loaded car passing through a bridge. The load automobile 2 is stopped for a period of time when reaching the position above the pasting position of the fiber grating strain sensor 4 through the bridge 1, and after reaching a stable state, the wavelength change value delta lambda of the fiber grating strain sensor 4 is read simultaneously1And strain value delta epsilon of standard resistance strain gauge1(ii) a Repeating the steps for 6 times to respectively obtain the average strain value of the standard resistance strain gauge 3 displayed by the upper computer 7
And the average wavelength of the fiber grating strain sensor 4
Changing the weight of the loaded automobile 2, repeating the steps, and obtaining the strain average value of the standard resistance strain gauge 3 again
And the average wavelength of the fiber grating strain sensor 4
Strain sensitivity coefficient of the fiber grating strain sensor 4
Complete the in-situ calibrationThe method is accurate.
The method comprises the following specific steps:
the method comprises the following steps: providing a standard resistance strain gauge;
step two: sticking a standard resistance strain gauge beside the fiber bragg grating strain sensor;
step three: connecting a standard resistance strain gauge with a resistance strain gauge, and connecting the resistance strain gauge with a computer; connecting the fiber bragg grating strain sensor with a fiber bragg grating demodulator, and connecting the fiber bragg grating demodulator with a computer;
step four: before a loaded automobile passes through a bridge, reading an initial value of a fiber bragg grating strain sensor, and zeroing a resistance strain gauge;
step five: the loaded automobile is stopped for a period of time when reaching the position above the pasting position of the fiber grating strain sensor through the bridge, and after reaching a stable state, the wavelength change value delta lambda of the fiber grating strain sensor is read1And strain value delta epsilon of standard resistance strain gauge1；
Step six: repeating the fourth step to the fifth step for 6 times;
step seven: calculating to obtain the strain average value of the standard resistance strain gauge
And wavelength average of fiber grating strain sensor
Step eight: changing the weight of the loaded automobile, and repeating the fourth step to the seventh step to obtain the average strain value of the standard resistance strain gauge
And wavelength average of fiber grating strain sensor
Step nine: calculating the strain sensitivity coefficient of the fiber grating strain sensor
And completing in-situ calibration.
The invention is disclosed by the above embodiments, and a simple variant of the in-situ calibration method for the fiber grating strain sensor is within the scope of the claims of the present invention.
Claims (1)
1. An in-situ calibration method of a fiber grating strain sensor comprises the following specific steps:
the method comprises the following steps: providing a standard resistance strain gauge;
step two: sticking a standard resistance strain gauge beside the fiber bragg grating strain sensor;
step three: connecting a standard resistance strain gauge with a resistance strain gauge, and connecting the resistance strain gauge with a computer;
connecting the fiber bragg grating strain sensor with a fiber bragg grating demodulator, and connecting the fiber bragg grating demodulator with a computer;
step four: before a loaded automobile passes through a bridge, reading an initial value of a fiber bragg grating strain sensor, and zeroing a resistance strain gauge;
step five: the loaded automobile is stopped for a period of time when reaching the position above the pasting position of the fiber grating strain sensor through the bridge, and after reaching a stable state, the wavelength change value delta lambda of the fiber grating strain sensor is read1And strain value delta epsilon of standard resistance strain gauge1；
Step six: repeating the fourth step to the fifth step for 6 times;
step seven: calculating to obtain the strain average value of the standard resistance strain gauge
And wavelength average of fiber grating strain sensor
Step eight: changing the weight of the loaded automobile, and repeating the fourth step to the seventh step to obtain the standardSampled average of resistance strain gauges
And the sampling average value of the fiber grating strain sensor
Step nine: calculating sensitivity coefficient of fiber grating strain sensor
And completing in-situ calibration.
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| CN202110868435.8A CN113587836A (en) | 2021-07-30 | 2021-07-30 | In-situ calibration method for fiber grating strain sensor |
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| CN202110868435.8A CN113587836A (en) | 2021-07-30 | 2021-07-30 | In-situ calibration method for fiber grating strain sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| JP2015121419A (en) * | 2013-12-20 | 2015-07-02 | 株式会社Ｉｈｉ検査計測 | Strain measuring method and strain measuring device |
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2021
- 2021-07-30 CN CN202110868435.8A patent/CN113587836A/en active Pending
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| US20020050174A1 (en) * | 2000-08-29 | 2002-05-02 | Antonio Valdevit | Displacement transducer |
| CN102288122A (en) * | 2011-04-22 | 2011-12-21 | 中国航空工业集团公司北京长城计量测试技术研究所 | Online calibrating device and method for fiber Bragg grating (FBG) strain sensor |
| JP2015121419A (en) * | 2013-12-20 | 2015-07-02 | 株式会社Ｉｈｉ検査計測 | Strain measuring method and strain measuring device |
| CN105066898A (en) * | 2015-08-16 | 2015-11-18 | 北京航空航天大学 | Method for calibrating surface-mounted fiber grating strain sensor |
| CN107036543A (en) * | 2015-10-14 | 2017-08-11 | 北京信息科技大学 | A kind of fiber Bragg grating strain sensor demarcation and fatigue detecting system |
| US20170313436A1 (en) * | 2016-04-27 | 2017-11-02 | Leonardo S.P.A. | Method of monitoring a composite material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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