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13 June 2005 Fast distance sensing by use of the speckle effect
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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 acoustooptical deflector to perform scanning the surface. Acousto-optical deflector provides the surface scanning at very high speed of 200 m/s. The complete optical-electronic system was designed and fabricated for measuring acquisition of two instant coordinates of the surface into a computer. The response time of the z-distance sensor in our first experiments is 16 microseconds. However, it is shown that the response of the sensor may be as fast as 100 nanoseconds. First measurements of the surface profile using fast scanning of the laser beam were experimentally demonstrated. 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.
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Ervin Nippolainen, Dmitry V. Semenov, Alexei A. Kamshilin, Andrey V. Belyaev, Sergei V. Andreev, and Boris S. Gurevich "Fast distance sensing by use of the speckle effect", Proc. SPIE 5856, Optical Measurement Systems for Industrial Inspection IV, (13 June 2005);

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