Ultrasonic Detection System Based on Two-Wave Mixing in Photorefractive Gaas Crystal

Date
1995
Authors
Blouin, Alain
Drolet, Denis
Monchalin, Jean-Pierre
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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].

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