LASER GENERATED GUIDED ULTRASONIC WAVE APPLICATIONS IN NON- DESTRUCTIVE EVALUATION
Krishnan Balasubramaniam, Vimal Vinod Shah and Daniel Costley Diagnostic Instrumentation and Analysis Laboratory Mail Stop 9549, Mississippi State University, MS 39762, USA
The paper discusses the use of laser based ultrasonic generation and remote detection of guided wave modes. This approach has several practical advantages including the non-contact, rapid scanning, extremely broad banded nature, extremely small spot size and hence high resolution of imaging, and relative insensitivity to the angle of access allowing ease in evaluating complex contoured structures. In this approach, a Q-Switched Nd-YAG laser system is used to produce rapid transient heating on the upper surface of the metallic structure. The ultrasonic guided wave modes thus generated can be used to evaluate material properties such as stiffness, residual stresses and anomaly characterization.
Publication Source: Trends in NDE Science & Technology; Proceedings of the 14th World Conference on Non-Destructive Testing, New Delhi, 8-13 December 1996.Vol. 4, pages 2311 - 2314 Publisher:Ashgate Publishing Company
NDTnet
