Optical fiber and fiber-optic sensing system using the same

摘要

An optical fiber (31) comprising an optical fiber main body and a coat formed therearound and made from a polyimide resin obtained by using as an acid component a tetracarboxylic dianhydride having at least two benzene rings fused or bound directly or via an oxygen atom has excellent resistance to high temperature and high humidity and adhesiveness to the optical fiber main body, and useful in a sensing part (41) in a fiber-optic sensing system comprising at least one sensing part (41) and signal transmitting paths.