Surface roughness measurement by laser speckle technique

Abstract

This paper reports the results of an experimental investigation of the surface roughness of aluminum metal sample. A unique, non-contact optical measurement technique has been used to study the roughness of the sample. This happens frequently due to corrosion on the surface of the specimen. The surface roughness profile records are analyzed by a novel pixel bright and dark pixel counting method to obtain the information of surface roughness which is satisfied with the conventional method of stylus profile measurement.