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Proceedings Paper

Robust laser-based detection of Lamb waves using photo-EMF sensors
Author(s): Marvin B. Klein; Gerald David Bacher
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Paper Abstract

Lamb waves are easily generated and detected using laser techniques. It has been shown that both symmetric and antisymmetric modes can be produced, using single-spot and phased array generation. Detection has been demonstrated with Michelson interferometers, but these instruments can not function effectively on rough surfaces. By contrast, the confocal Fabry-Perot interferometer can interrogate rough surfaces, but generally is not practical for operation below 300 kHz. In this paper we will present Lamb wave data on a number of parts using a robust, adaptive receiver based on photo-emf detection. This receiver has useful sensitivity down to at least 100 kHz, can process speckled beams and can be easily configured to measure both out-of-plane and in- plane motion with a single probe beam.

Paper Details

Date Published: 15 March 1998
PDF: 6 pages
Proc. SPIE 3399, Process Control and Sensors for Manufacturing, (15 March 1998); doi: 10.1117/12.302559
Show Author Affiliations
Marvin B. Klein, Lasson Technologies, Inc. (United States)
Gerald David Bacher, Lasson Technologies, Inc. (United States)

Published in SPIE Proceedings Vol. 3399:
Process Control and Sensors for Manufacturing
Richard H. Bossi; David M. Pepper, Editor(s)

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