Fast distance measurements based on dynamic speckles induced by acousto-optic scanning

Ervin Nippolainen; Dmitry V. Semenov; Alexei A. Kamshilin; Andrei V. Belyaev; Sergei V. Andreev; Boris S. Gurevich

doi:10.1117/12.695494

15 September 2006 Fast distance measurements based on dynamic speckles induced by acousto-optic scanning

Ervin Nippolainen, Dmitry V. Semenov, Alexei A. Kamshilin, Andrei V. Belyaev, Sergei V. Andreev, Boris S. Gurevich

Proceedings Volume 6341, Speckle06: Speckles, From Grains to Flowers; 634128 (2006) https://doi.org/10.1117/12.695494
Event: Speckle06: Speckles, From Grains to Flowers, 2006, Nimes, France

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.

Citation Download Citation

Ervin Nippolainen, Dmitry V. Semenov, Alexei A. Kamshilin, Andrei V. Belyaev, Sergei V. Andreev, and Boris S. Gurevich "Fast distance measurements based on dynamic speckles induced by acousto-optic scanning", Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 634128 (15 September 2006); https://doi.org/10.1117/12.695494

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