Abstract

The far-field pattern of light scattered by a small rough metallic surface area is obtained with a coherent optical system and used to quantify roughness measurements of machined surfaces. The distribution is usually anisotropic due to tooling marks. A cylinder lens forms a 1-D transform at favorable angular orientations about the optic axis to circumvent this problem and provides useful spectrum averaging. The integrated Gaussian curve fits to experimentally observed scattered light patterns from individual roughness samples yield an empirical linear relation between a Gaussian width parameter and average roughness height.

© 1979 Optical Society of America

Surface roughness measurements by means of polychromatic speckle patterns

C. T. Stansberg
Appl. Opt. 18(23) 4051-4060 (1979)

Fatigue crack detection on rough surfaces by optical Fourier analysis

Benjamin J. Pernick and James R. Kennedy
Appl. Opt. 24(12) 1764-1769 (1985)

Surface-roughness measurement using Fourier transformation of doubly scattered speckle pattern

Kiyoshi Nakagawa, Takeaki Yoshimura, and Takumi Minemoto
Appl. Opt. 32(25) 4898-4903 (1993)

Relation between the angular dependence of scattering and the statistical properties of optical surfaces

J. M. Elson and J. M. Bennett
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Surface roughness measurement by means of polychromatic speckle elongation

Peter Lehmann, Stefan Patzelt, and Armin Schöne
Appl. Opt. 36(10) 2188-2197 (1997)