Hitachi, Ltd.

Takayuki Fumino

Masahiro Komachiya

Tatsunori Sakaguchi

Satoshi Shimada

Takao Sasayama

Takao Miwa

Shigeru Oho

Rintaro Minamitani

Shizuhisa Watanabe

An optical fiber 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 in a fiber-optic sensing system comprising at least one sensing part and signal transmitting paths.

Optical fiber and fiber-optic sensing system using the same

An optical fiber pressure sensor for measuring a pressure on the basis of an optical power loss depending on a configuration change of an optical fiber comprising a luminescence device optically connected with at least an optical fiber which is constructed with a main part for propagating a light protective coating member for protecting the main part. A light intercepting device detects a light passing through the optical reflected light from the optical fiber. A bending device bends at least a part of the optical fiber according to a measured pressure. The optical fiber pressure sensor is characterized by being used when a normalization frequency V value of the optical fiber is smaller than 90% of a normalization cut-off frequency defining a single transmission mode condition of the optical fiber.

Optical fiber pressure sensor

Growing community of inventors

Hitachinaka, Japan

Takayuki Fumino