Calibration method of fiber grating pressure sensor

Abstract

The invention discloses a calibration method of an optical fiber grating pressure sensor, comprising the following steps: placing the optical fiber grating pressure sensor to be calibrated in a universal testing machine, and carrying out three full-scale preloads; connecting the optical fiber grating pressure sensor to be calibrated to a demodulator instrument, when it drops to no-load, the demodulator records the initial wavelength value; set the position of all pressure detection points of the calibrated fiber grating pressure sensor, and use the universal testing machine to apply pressure to it, and the demodulator records synchronously with each The wavelength value corresponding to the pressure detection point; the standard pressure sensor carried by the universal testing machine records the actual pressure value applied at each pressure detection point, and sends it to the host computer data processing unit in real time; repeat the above steps three times, and the demodulator records All wavelength values ​​are sent to the host computer data processing unit in real time, and the sensitivity, fitting error, linearity indication error, zero return error and repeatability index of the calibrated fiber grating pressure sensor are calculated.

Description

technical field [0001] The invention relates to the technical field of optoelectronic measuring devices, in particular to a calibration method for an optical fiber grating pressure sensor. Background technique [0002] Fiber Bragg grating sensors are widely used in power system monitoring due to their strong anti-electromagnetic interference and low transmission loss. In order to ensure the accuracy of monitoring data and ensure engineering safety, the fiber grating sensor used must be calibrated and calibrated before use, otherwise large measurement errors will lead to serious safety and quality problems. Among them, there is a kind of fiber grating pressure sensor. In order to get an accurate calibration conclusion, the important factors such as pressure indication calibration, sensitivity, linearity, fitting error, indication error, zero return error and repeatability should be considered comprehensively. Calculation of static calibration coefficients. [0003] However,...

AI Technical Summary

Problems solved by technology

However, this kind of calibration device and calibration method has poor adaptability, and the accuracy of the calibration results needs to be improved.

Images