Device for testing components of transparent material for surfac

Details Device for testing components of transparent material for surfac Device for testing components of transparent material for surfac

1987-06-15

1989-03-28

Evans, F. L.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

356124, 356239, 356426, 250572, G01N 2188

Patent

active

048158445

ABSTRACT:
A device for testing components of transparent material for surface irregularities and occlusions which comprises a mechanism for rotatably mounting the component so that the component may be rotated on its axis; a mechanism for generating a light ray which moves linearly so that the light ray can dot-scan the component along a diameter of the component; at least one signal generating device disposed at a predetermined angle to the direction of impingement of the light ray for detecting surface irregularities and occlusions of the component and then generating a signal representative of the irregularity or occlusion; and a signal evaluation device for evaluating the signals produced in the signal generating device. The signal generating device comprises an image forming optical system; an interchangeable mask disposed at the focal plane of the image forming optical system for selecting the image of a plane of the component; and a receiver for receiving the light rays passing the mask and generating a signal representative of the light rays received.

REFERENCES:
patent: 3892494 (1975-07-01), Baker et al.
patent: 3947127 (1976-03-01), Bennett et al.
patent: 3988068 (1976-10-01), Sprague
patent: 4460273 (1984-07-01), Koizumi et al.

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