Optics: measuring and testing – Inspection of flaws or impurities – Having predetermined light transmission regions
Patent
1982-02-08
1984-08-14
Arnold, Bruce Y.
Optics: measuring and testing
Inspection of flaws or impurities
Having predetermined light transmission regions
35016211, 356445, G01N 2100, G01N 2155
Patent
active
044653719
ABSTRACT:
An optical method and apparatus for nondestructively inspecting a specimen for evidence of surface flaws, for example, cracks granularity and/or roughness characteristics, which would be indicative of component expected lifetime before failure are disclosed.
The distribution pattern of coherent light scattered by a surface illuminated sample is obtained with a transform lens (for a two-dimensional pattern) or a transform-cylinder lens pair (for a one-dimensional pattern). The surface scattered light distribution is inherently different for flawed and unflawed samples. Spatial frequency signatures obtained from measurements of the scattered light diffraction patterns are used to distinguish flawed from unflawed specimens. Measurements are not restricted to planar surfaces; curved sample shapes can be employed with appropriate optical component adjustments.
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Arnold Bruce Y.
Grumman Aerospace Corporation
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