Research on stress sensing demodulation technology and device of FBG

Since fiber Bragg grating has good reliability, stability, anti-interference and intrinsic safety, which is very suitable for the application of coal mine gas environment, a fiber Bragg grating stress sensing monitoring system based on metal bolt in coal mine is developed. This paper focuses on the design and research of the core equipment of the system, grating stress sensing demodulation device. Through the study of strain measurement principle of FBG and the study of demodulation technology of tunable F-P filter, through the design of hardware circuit and software program of demodulation device, the special stress demodulation device of fiber Bragg grating bolt is developed. Finally, the accuracy and practicability of the demodulation device are verified by the actual experimental test of fiber Bragg grating stress sensor.