Development of vibration and deformation monitoring techniques for high temperature structures by heat-resistant FBG, 4

Shimada, Yukihiro; Nishimura, Akihiko  ; Saruta, Koichi   ; Tsukimori, Kazuyuki; Yoshikawa, Masanari*; Kobayashi, Takao*

A Fiber Bragg Grating (FBG) sensor is a powerful method of vibration of a structure and the leading methods of carrying out modification monitoring. However, since the FBG sensor which exists now does not have high temperature resistance, use in a high temperature plant is difficult. In recent years, the micro fabrication to high embrittlement materials, such as quartz, became possible by development of ultra fast pulsed laser. We performed the non-heat laser processing to the optical fiber using femto-second pulsed laser.