Fiber bragg grating strain sensitivity calibration device and method
A strain sensitivity, fiber grating technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of fiber grating sensor strain, etc., to improve the measurement accuracy, avoid repeated use, and accurate calibration.
Inactive Publication Date: 2013-05-15
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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[0003] The purpose of the present invention is to provide a calibration device and method for the strain sensitivity of the fiber grating sensor in order to solve the problem of calibration of the strain sensitivity of the fiber grating sensor
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Embodiment 1
[0024] The optical fiber grating strain sensitivity calibration device of the present invention includes a first sensor clamping device 1, a second sensor clamping device 3, a fiber grating sensor 2, an air-floating guide rail moving coil 4, an air-floating guide rail 5, a laser interferometry system 6, Interferometer support 7, vibration isolation platform 8, micro-displacement driver 9, force sensor 10, clamping device support 11, fiber grating demodulation device 12, such as figure 1 shown.
[0025] The fiber grating sensor is a metal substrate fiber grating strain sensor whose model is FS3100; the model of the fiber grating demodulation device is FI220.
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Abstract
The invention relates to a fiber bragg grating strain sensitivity calibration device and a method. The device comprises two sensor clamping device, a gas floating guide rail, a laser interferometry system, a fiber bragg grating demodulator and the like. The fiber bragg grating sensor is fixed through the two sensor clamping devices, and is driven by a micrometric displacement drive device to be installed on the sensor clamping devices on the gas floating guide rail to enable the sensor to generate tensile or compressive strain. Sensor length variation is measured through the laser interferometry system, fiber bragg grating sensor wavelength variation read by the fiber bragg grating demodulator is compared with the compressive strain, and fiber bragg grating strain sensitivity calibration is achieved. The fiber bragg grating strain sensitivity calibration device and the method uses the gas floating guide rail to guide the stretching and compression process of the fiber bragg grating, uses the laser interferometry system to measure the length variation of the fiber bragg grating sensor, and the fiber bragg grating sensor can be calibrated accurately without damage.
Description
technical field [0001] The invention relates to a calibration device and method for the strain sensitivity of an optical fiber grating, belonging to the technical field of measurement testing and calibration. Background technique [0002] Fiber Bragg Grating (Fiber Bragg Grating), referred to as fiber grating, is a kind of fiber optic sensor, which has the advantages of small size, light weight, anti-electromagnetic interference, wavelength division multiplexing, etc., and has been more and more widely used in large-scale structural health monitoring and intelligent Composite materials and other fields. In the field of structural health monitoring, FBG sensors are mainly used for monitoring strain parameters. At present, the metal packaged fiber grating sensor is usually pasted or welded on the surface of the structure, or the fiber grating is directly embedded in the composite material to monitor the strain state of the structure. However, at present, the strain measureme...
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Inventor 宋昊薛景锋郑明慧赵印明郭伟王文娟张慧君
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA