Laser ultrasonic testing system using a confocal Fabry-Perot interferometer with a fringe stabilization module

Sung-Hoon Baik; Seung-Kyu Park; Min-Suk Kim; Chang-Hwan Lim; Byung Heon Cha

doi:10.1117/12.572201

13 January 2005 Laser ultrasonic testing system using a confocal Fabry-Perot interferometer with a fringe stabilization module

Sung-Hoon Baik, Seung-Kyu Park, Min-Suk Kim, Chang-Hwan Lim, Byung Heon Cha

Author Affiliations +

Proceedings Volume 5629, Lasers in Material Processing and Manufacturing II; (2005) https://doi.org/10.1117/12.572201
Event: Photonics Asia, 2004, Beijing, China

Abstract

A laser ultrasonic testing system using a confocal Fabry-Perot interferometer and a pulsed Nd:YAG laser is developed for the fatigue test of materials. To stabilize the fringe pattern of the confocal interferometer, an adaptive stabilization fringe control system is developed using two photodiode signals. The closed-loop fringe control system is operated automatically. The optical system is composed of many polarization components, such as a half-wave plate, quarter-wave plates and polarization beam splitters to improve the signal to noise ratio. The laser ultrasonic system carried out performance test. The optical configuration of the interferometer system and the stabilization module are investigated in this paper. The experimental results of the basic experiments are also described.

Citation Download Citation

Sung-Hoon Baik, Seung-Kyu Park, Min-Suk Kim, Chang-Hwan Lim, and Byung Heon Cha "Laser ultrasonic testing system using a confocal Fabry-Perot interferometer with a fringe stabilization module", Proc. SPIE 5629, Lasers in Material Processing and Manufacturing II, (13 January 2005); https://doi.org/10.1117/12.572201

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