Abstract

An analysis of a surface flaw detection method is presented in which oblique illumination is combined with a high pass spatial filter to detect the light scattered from surface flaws. The effects of surface finishes of test samples (meteoric plates) are assessed statistically, and the sensitivity of the system is calculated. Data have been collected on diffraction patterns and surface scratch detection for three stainless steel plates having different surface finishes. The results agree with theoretical considerations and are quite promising.

© 1972 Optical Society of America

Experimental Analysis of Surface Flaw Detection Using Grazing Angle Illumination

T. Sawatari, P. N. Keating, and R. B. Zipin
Appl. Opt. 12(11) 2598-2606 (1973)

Inspection of surface flaws by comparator microscopy

L. R. Baker
Appl. Opt. 27(22) 4620-4625 (1988)

Surface Roughness Measurement Using White Light Speckle

Robert A. Sprague
Appl. Opt. 11(12) 2811-2816 (1972)

Surface Roughness Measurement by Holographic Interferometry

W. B. Ribbens
Appl. Opt. 11(4) 807-810 (1972)

Light Scattering from Fused Polycrystalline Aluminum Oxide Surfaces

D. H. Hensler
Appl. Opt. 11(11) 2522-2528 (1972)