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Proceedings Paper

Laser ultrasonic testing system using a confocal Fabry-Perot interferometer with a fringe stabilization module
Author(s): Sung-Hoon Baik; Seung-Kyu Park; Min-Suk Kim; Chang-Hwan Lim; Byung Heon Cha
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Paper 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.

Paper Details

Date Published: 13 January 2005
PDF: 6 pages
Proc. SPIE 5629, Lasers in Material Processing and Manufacturing II, (13 January 2005); doi: 10.1117/12.572201
Show Author Affiliations
Sung-Hoon Baik, Korea Atomic Energy Research Institute (South Korea)
Seung-Kyu Park, Korea Atomic Energy Research Institute (South Korea)
Min-Suk Kim, Korea Atomic Energy Research Institute (South Korea)
Chang-Hwan Lim, Korea Atomic Energy Research Institute (South Korea)
Byung Heon Cha, Korea Atomic Energy Research Institute (South Korea)


Published in SPIE Proceedings Vol. 5629:
Lasers in Material Processing and Manufacturing II
ShuShen Deng; Akira Matsunawa; Y. Lawrence Yao; Minlin Zhong, Editor(s)

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