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Development of Ultrasonic Wave Propagation Imaging System  

Chia, Chen-Ciang (Department of Aerospace Engineering, Chonbuk National University)
Lee, Jung-Ryul (Department of Aerospace Engineering, Chonbuk National University)
Kim, Jong-Heon (Agency for Defense Development)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.29, no.4, 2009 , pp. 283-292 More about this Journal
Abstract
Laser-based ultrasonic sensing requires the probe with fixed fecal length, but this requirement is not essential in laser-based ultrasonic generation. Based on this fact, we designed a pulsed laser-based ultrasonic wave propagation imaging (UWPI) system with a tilting mirror system for rapid scanning of target, and an in-line band-pass filtering capable of ultrasoaic mode selection. 1D-temporal averaging, 2D-spatial averaging, and 3D-data structure building algorithms were developed far clearer results allowing fur higher damage detectability. The imaging results on a flat stainless steel plate were presented in movie and snapshot formats which showed the propagation of ultrasound visible as a concentric wavefield emerging from the location of an ultrasonic sensor. A hole in the plate with a diameter of 1 mm was indicated by the scattering wavefields. The results showed that this robust UWPI system is independent of focal length and reference data requirements.
Keywords
Q-Switched Pulsed Laser; Laser Ultrasonics; Ultrasonic Wave Propagation Imaging; Nondestructive Test and Evaluation;
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