Robust laser-based detection of Lamb waves using photo-EMF sensors

Marvin B. Klein; Gerald David Bacher

doi:10.1117/12.302559

15 March 1998 Robust laser-based detection of Lamb waves using photo-EMF sensors

Marvin B. Klein, Gerald David Bacher

Proceedings Volume 3399, Process Control and Sensors for Manufacturing; (1998) https://doi.org/10.1117/12.302559
Event: Non-Destructive Evaluation Techniques for Aging Infrastructure and Manufacturing, 1998, San Antonio, TX, United States

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.

Citation Download Citation

Marvin B. Klein and Gerald David Bacher "Robust laser-based detection of Lamb waves using photo-EMF sensors", Proc. SPIE 3399, Process Control and Sensors for Manufacturing, (15 March 1998); https://doi.org/10.1117/12.302559

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