Abstract:We present distance measurement technique to any rough surface based on spatial filtering of a speckle pattern generated when the object surface is scanned by a laser beam deflected from an acousto-optic device. Scanning velocity of 150 m/s allows to complete single measurement within as short time as 50 ns. However stochastic nature of the speckle effect caused rather high inaccuracy. The data averaging is easily implemented within a single scan and allows us to achieve the accuracy of 110 gm within the time … Show more
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