Abstract

A new technique is described that is capable of sensing surface roughness of moving materials. The method is based on analysis of the intensity fluctuations of laser light backscattered at an angle from the surface. The optical correlation length supplied by this method is related to the surface topography through the derivative surface profile. Laboratory and paper plant experiments confirmed the applicability of the optical correlation length technique in the characterization of random surfaces.

© 1986 Optical Society of America

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