System for detecting selective refractive defects in transparent

Details System for detecting selective refractive defects in transparent System for detecting selective refractive defects in transparent

1984-07-27

1986-08-19

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Containers or enclosures

250223B, G01N 2141, G01N 2189

Patent

active

046066349

ABSTRACT:
A system of illuminating a transparent glass article, such as a TV faceplate, for detecting optical defects. The source of illumination is tailored so as to be space invariant and results in producing a plurality of collimated beams which travel in a continuum of different directions. A uniformly illuminated diffuser plate with a mask has the attribute of enhancing refractive defects of a given magnitude while not detecting those of a more gradual refractive nature. The object is viewed with a linear diode array camera of a given acceptance angle.

REFERENCES:
patent: 2798605 (1957-07-01), Richards
patent: 3094214 (1963-06-01), Wyman et al.
patent: 4017194 (1977-04-01), Conroy et al.
patent: 4378493 (1983-03-01), Dorf et al.

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