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Proceedings Paper

Fast distance measurements based on dynamic speckles induced by acousto-optic scanning
Author(s): Ervin Nippolainen; Dmitry V. Semenov; Alexei A. Kamshilin; Andrei V. Belyaev; Sergei V. Andreev; Boris S. Gurevich
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Paper Abstract

We propose novel technique for z-distance measurement to an optically rough surface using dynamic speckles. The technique is based on the continuous frequency measurements of the power modulation of the spatially filtered scattered light. The dynamic speckle pattern is created when the laser beam scans the surface under study. We use an acousto-optical deflector to perform scanning the surface. Acousto-optical deflector provides the surface scanning at very high speed up to 500 m/s. Therefore, by using spatial filtering technique of dynamic speckle, the distance to the object surface can be measured within extremely small time window, less than 100 ns. The proposed technique can be very useful for monitoring the surface profile and/or vibrations of the fast moving or fast rotating surfaces in various industrial applications.

Paper Details

Date Published: 15 September 2006
PDF: 6 pages
Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 634128 (15 September 2006); doi: 10.1117/12.695494
Show Author Affiliations
Ervin Nippolainen, Univ. of Kuopio (Finland)
Dmitry V. Semenov, Univ. of Kuopio (Finland)
Alexei A. Kamshilin, Univ. of Kuopio (Finland)
Andrei V. Belyaev, Scientific Devices Ltd. (Russia)
Sergei V. Andreev, Scientific Devices Ltd. (Russia)
Boris S. Gurevich, Scientific Devices Ltd. (Russia)

Published in SPIE Proceedings Vol. 6341:
Speckle06: Speckles, From Grains to Flowers
Pierre Slangen; Christine Cerruti, Editor(s)

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