Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 07, 2017 - October 09, 2017
In order to improve the convenience in handling for acoustic emission (AE) measurement with interferometer type optical fiber sensors, an application of the Fabry-Perot interferometer made of a pair of fiber Bragg gratings (FP-FBG) was investigated. A single FP-FBG fiber behaving the sensing fiber was put and adhered between a pair of semi-cylindrical blocks for detecting the out-of-plane component of AE waves same as conventional piezoelectric type AE sensors. It was demonstrated that the sensitivity of the proposed sensor hardly varies in accordance with incident directions of AE waves. The relationship between the reflective characteristics of the FBG and the sensitivity for AE detection with the FP-FBG fiber was also examined. It was found that both of the change of the lattice spacing in the FBG and the fluctuation of the distance between a pair of the FBGs affect the sensitivity of the sensor. It was demonstrated that AE signals associated with breaking PMMA specimens could be successfully detected by the proposed sensor.
