A Non-Contact Laser-Emat System for Crack and Hole Detection in Metal Plates

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1998
Authors
Dixon, S.
Edwards, C.
Palmer, S.
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Review of Progress in Quantitative Nondestructive Evaluation
Center for Nondestructive Evaluation

Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.

This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.

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Abstract

The use of non-contact ultrasonic techniques can have distinct advantages over conventional contact methods, allowing more rapid and practical scanning without suffering from variations introduced by an acoustic couplant. Non-contact ultrasonic testing can also be used for inspecting components on a production line. The system described here uses separate ultrasonic generation and detection techniques. Longitudinal waves are generated in a sample by means of a pulsed laser, and waves scattered from defects within the sample are used to identify the presence and location of simulated surface breaking cracks and side drilled holes. The longitudinal waves are detected using an electromagnetic acoustic transducer (EMAT) on the same side as the ultrasonic generation point, located coaxial to the generation laser beam.

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Thu Jan 01 00:00:00 UTC 1998