Apparatus for detecting faults in transparent objects

Details Apparatus for detecting faults in transparent objects Apparatus for detecting faults in transparent objects

1983-12-13

1985-10-15

Kittle, John E.

Optics: measuring and testing

Inspection of flaws or impurities

Transparent or translucent material

356 33, 356240, 250223B, G01B 1118, G01N 2104

Patent

active

045470677

ABSTRACT:
In a detecting system adapted to detect foreign matters as faults of a glass bottle, between a projection path of a diffused light towards the object to be inspected and said object, a plane polarizing plate of a circular polarizer which includes the plane polarizing plate combined with a 1/4 wave plate is disposed at the side of a diffused light side, while, in a light path which causes light transmitted through the object to form an image on the photoelectric detector 6 through the lens, a detecting side circular polarizer which includes a 1/4 wave plate and a plane polarizing plate is placed. An output electric signal of the photoelectric detector is subjected to analog operation processing.

REFERENCES:
patent: 3411009 (1963-11-01), Ford et al.
patent: 3727068 (1973-04-01), Poynton et al.
patent: 3811775 (1974-05-01), Abu-Saud
patent: 3963348 (1976-06-01), Nakatani et al.
patent: 4280624 (1981-07-01), Ford

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