System employing preconditioned radiation for detecting defects

Details System employing preconditioned radiation for detecting defects System employing preconditioned radiation for detecting defects

1988-03-02

1990-02-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356240, G01N 904

Patent

active

049009168

ABSTRACT:
An apparatus and method for inspecting transparent objects is disclosed. The apparatus employs preconditioned radiation to detect defects having small radii of curvature or other such highly refractive surfaces and discriminate them from desirable markings having larger radii of curvature. The apparatus comprises a radiation source, means for selecting angular spectrum ranges, means for modifying average angles of incidence, radiation detection means and processing means.

REFERENCES:
patent: 4201338 (1980-05-01), Keller
patent: 4230266 (1980-10-01), Juvinall
patent: 4547067 (1985-10-01), Watanabe
patent: 4606634 (1986-08-01), Bieringer
patent: 4610542 (1986-09-01), Ringlien
patent: 4682023 (1987-07-01), Yoshida
R. Cormack et al., "Optical and Digital Pattern Recognition", Proceedings of the SPIE-The International Society for Optical Engineering, vol. 754, Jan. 13-15, 1987, Los Angeles, Calif.

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