Ultrasonic Detection System Based on Two-Wave Mixing in Photorefractive Gaas Crystal
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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.
The generation and the detection of ultrasound at distance by lasers present many advantages over conventional piezo-electric based methods. In particular, it can be used on surfaces of complex geometry and on products at elevated temperature on a production line [1,2]. Detection has been so far usually performed by using interferometers with passive elements, the most useful being the confocal Fabry-Perot interferometer used in a transmission or reflection mode. [1,3–5].