A laser ultrasonic inspection system has the advantage of nondestructive testing. It is a non-contact mode using a laser interferometer to measure the vertical displacement of the surface of a material caused by the propagation of ultrasonic signals with the remote ultrasonic generated by laser. After raising the ultrasonic signal with a broadband frequency range using a pulsed laser beam, the laser beam is focused to a small point to measure the ultrasonic signal because it provides an excellent measurement resolution. In this paper, foreign materials are measured by a non-destructive and non-contact method using the laser ultrasonic inspection system. Mixed foreign material on the corroded part is assumed and the laser ultrasonic experiment is conducted. An ultrasonic wave is generated by pulse laser from the back of the specimen and an ultrasonic signal is acquired from the same location of the front side using continuous wave laser and Confocal Fabry-Perot Interferometer (CFPI). The characteristic of the ultrasonic signal of existing foreign material is analyzed and the location and size of foreign material is measured.
© 2013 Optical Society of Korea
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3540) Lasers and laser optics : Lasers, Q-switched
Original Manuscript: April 29, 2013
Revised Manuscript: June 20, 2013
Manuscript Accepted: July 2, 2013
Published: August 25, 2013
Kyung Min Hong, Young June Kang, Nak Kyu Park, and In Young Choi, "Preliminary Study of the Measurement of Foreign Material in Galvanic Corrosion Using Laser Ultrasonic," J. Opt. Soc. Korea 17, 323-327 (2013)
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