Evaluation of the broadband Lamb wave propagation behaviour under high-temperature environment by laser ultrasound measurement method using optical fiber sensor

Abstract

Currently, the authors are attempting to construct a high-temperature nondestructive inspection method using a guided wave. In this research, we attempted to measure guided waves traveling through metallic materials placed in high temperature environment by receiving laser ultrasonic wave with remote ultrasonic measurement method using optical fiber sensor. The propagation behavior of the S0 mode and the A0 mode in the broadband Lamb wave excited by the laser was evaluated. Furthermore, we tried to evaluate the change of material property value at high temperature from the change of their propagation behavior/