NASA NTRS · 19740000118
Surface roughness measured by optical signatures
Abstract
To measure roughness of metal surfaces by nondestructive means direct laser beam at surface and record distribution pattern of intensity of reflected light to obtain optical signature for comparison with calibrated surface. Signature of machined surface with scratch compared to that of regularly-patterned machined surface may also detect imperfections.
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Salvinski, R. J., Roszhart, T. V.. 1974-08-01. Surface roughness measured by optical signatures. https://ntrs.nasa.gov/citations/19740000118
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