Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 24, 2016 - November 26, 2016
Because of the stable material property of optical fiber up to 1000 °C, fiber Bragg grating (FBG) sensor is considered as one of possible ultrahigh-temperature resistant ultrasonic sensor. However, disappearance of reflectivity of a normal FBG in the high temperature above 900 °C makes the ultrasonic detection impossible. In order to detect ultrasonic wave under high temperature environments, we conducted an anneal heat treatment to produce a regenerated fiber Bragg grating (RFBG) sensor. Because the RFBG has a stable reflectivity even at temperature of 1000 °C, we detected the ultrasonic wave successfully at the temperature.
