Optical detection of ultrasound at a distance using a confocal Fabry–Perot interferometer

Monchalin, Jean-Pierre
July 1985
Applied Physics Letters;7/1/1985, Vol. 47 Issue 1, p14
Academic Journal
A novel scheme to detect ultrasonic motion at the surface of a solid sample is presented. The surface of the sample is illuminated by a laser and the light scattered by the surface is received by a confocal Fabry–Perot interferometer which demodulates the Doppler shift produced by ultrasound. Experimental results, obtained at a distance of 1.5 m from a machined but not polished steel plate, and excited by ultrasound produced by a laser pulse, are presented.


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