Laser Surface Finish Gauge

Harry S. Corey

doi:10.1117/12.959397

31 October 1980 Laser Surface Finish Gauge

Harry S. Corey

Proceedings Volume 0247, Advances in Laser Engineering and Applications; (1980) https://doi.org/10.1117/12.959397
Event: 24th Annual Technical Symposium, 1980, San Diego, United States

Abstract

A laser surface finish gauge has been developed to measure the roughness of the entire inside surface of hemishells in the range of 4 to 10 microinches roughness average (Ra). Standards have been fabricated that allow for traceability of the gauge's measurements to the National Bureau of standards. The gauge employs the principles of angular scatter from a laser beam and was designed to eliminate errors introduced by varying degrees of part reflectance and changes in laser intensities. A microprocessor is used to extract data from the standards and manipulate the scatter information from test parts to produce a continuous trace of the part surface roughness on a strip chart. The gauge has been installed in a product certification laboratory and a statistical evaluation made which indicates a repeatability of +0.5 microinch Ra. The principles and theories under which the gauge was developed can easily be adapted to other part configurations and roughness ranges.

Citation Download Citation

Harry S. Corey "Laser Surface Finish Gauge", Proc. SPIE 0247, Advances in Laser Engineering and Applications, (31 October 1980); https://doi.org/10.1117/12.959397

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