Characterization of Laser Ultrasonic Sources Using a Sagnac Interferometer
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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
Knowledge of optimal conditions for laser generation of ultrasonic waves, as well as of the spatial and temporal parameters of the generated ultrasonic beams, is required for effective application of laser-based ultrasonic (LBU) techniques to NDE [1]. The work presented here employs a fiberized Sagnac interferometer to characterize a fiber-array based LBU system. The combined system can remotely generate and detect ultrasonic signals with energy concentrated within a selected narrow frequency band.