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Optical Engineering

Laser examination of cast surface roughness
Author(s): Konrad Lukaszewski; Kazimierz Rozniakowski; Tomasz W. Wojtatowicz
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Paper Abstract

We present the results of experimental examinations of the interaction of laser light with the surfaces of cast test bars. From the scientific literature, it is known that the unique properties of laser radiation result in the grained structure (called speckles) of the angular distribution for the intensity of light reflected from rough surfaces. The features of these speckles depend on the characteristics of the rough surfaces. The measuring circuit of the experimental set-up consisted of a CCD camera and a microcomputer. Computer analysis of the speckle images (or angular distributions) recorded with the camera reveal the existence of the dependencies between the parameters of surface roughness (i.e., the mean square deviation of the profile o) and some features of these images (the mean area S under the curve of light intensity for one line of the image or its contrast C). The examined samples of the castings have the values of the profile roughness height Rz from the range 10 to 160 ?m.

Paper Details

Date Published: 1 September 2001
PDF: 5 pages
Opt. Eng. 40(9) doi: 10.1117/1.1387440
Published in: Optical Engineering Volume 40, Issue 9
Show Author Affiliations
Konrad Lukaszewski, Technical Univ. of Lodz (Poland)
Kazimierz Rozniakowski, Technical Univ. of Lodz (Poland)
Tomasz W. Wojtatowicz, Technical Univ. of Lodz (Poland)

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