Calibration device for fiber Bragg grating vibration sensor and uncertainty analysis method of calibration device

Abstract

The invention relates to a calibration device for a fiber Bragg grating vibration sensor and an uncertainty analysis method of the calibration device and belongs to the technical field of calibrationof vibration sensors. According to the method, a calibrated fiber Bragg grating vibration sensor and a standard fiber Bragg grating vibration sensor are fixed at the center of a vibration table back to back; a signal generator emits a sinusoidal vibration signal, signal amplification is carried out on the sinusoidal vibration signal and the vibration table vibrates at a certain frequency through the sinusoidal vibration signal; the two fiber Bragg grating vibration sensors bear the same vibration signal, but output different output quantities; the sensitivity of the calibrated fiber Bragg grating vibration sensor is calculated by using the linear variation relation between acceleration and wavelength changes of fiber Bragg gratings in an elastic system through comparing and analyzing two groups of output quantities, thereby achieving calibration of the fiber Bragg grating vibration sensor; and type A uncertainty and type B uncertainty are analyzed and synthesized, thereby achieving uncertainty analysis of the fiber Bragg grating vibration sensor.

Description

technical field [0001] The invention relates to a calibration device of a fiber grating vibration sensor and an uncertainty analysis method thereof, belonging to the technical field of calibration of vibration sensors. Background technique [0002] As one of the key components in the testing technology, the fiber Bragg grating vibration sensor has the advantages of low cost, high sensitivity, stable and reliable operation, etc. It can measure various physical quantities such as displacement (amplitude), velocity, and acceleration. It has been widely used in many fields such as industrial equipment inspection, medical inspection, geological survey and so on. For the newly developed sensor, it must be calibrated before it can be used in actual engineering. At present, there are mainly absolute methods for the calibration of vibration sensors in China. The absolute method is to input the vibration signal through the high-precision standard vibration table, and the output sign...

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Problems solved by technology

The absolute calibration method has high accuracy of calibration data, but the operation is difficult, the experimental process is cumbersome, and the experiment is difficult

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