A METHOD TO MAKE HIGH SENSITIVE FIBER BRAGG GRATING TEMPERATURE SENSORS

摘要

A method to make high sensitive fiber Bragg grating temperature sensors, composing of a fiber Bragg grating and two metals different in the coefficient of thermal expansion, specialized in for controlling its work temperature, the fiber Bragg grating is pre-relaxed Δd = [α1 L - α2 (L — d)](Ts — Tr), where α1 and α2 are the CTE of metal A and metal B, respectively, L is the length of metal A, d is the distance between the two mounting points, Ts is the temperature where the sensor starts to work, and Tr is the room temperature