Laser-Ultrasonic Non-Destructive Testing:hniques and Applications in Nuclear Industry
Laser-Ultrasonic Non-Destructive Testing:hniques and Applications in Nuclear Industry
著者:
Makoto OCHIAI Takahiro MIURA Satoshi YAMAMOTO Toru ONODERA
発刊日:
公開日:
bottom-mounted rumentationcrack sizinglaser peeninglaser-ultrasonicsnon-destructive testingpreventative maintenancestress corrosion crackingsurface acoustic wave
概要
A New method for non-destructive testing (NDT) of surface-breaking tight cracks based on laser-induced nce acoustic waves (SAW) is proposed. A Q-switched Nd:YAG laser is used to generate SAW through Live interaction between material and the laser pulses. The SAW is probed by an optical interferometer as a o displacement of the surface. A state-of-the-art technique in laser-ultrasonic NDT is reviewed: that is the < depth measurement by using fr equency analysis of SAW transmitted through cracks. The technique vs measuring a depth of the surface-breaking micro crack ranging 0.5-1.5 mm with the standard deviation 2 mm. Performance on crack depth measurements with the stress corrosion cracking (SCC), having depths Cound 1 mm, are demonstrated. Also, the laser-ultrasonic NDT system developed for the inner surface of om-mounted instrumentation (BMI) and its mock-up results are introduced.
