Laser shadowgraph

Details Laser shadowgraph Laser shadowgraph

1980-06-18

1982-07-27

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Transparent or translucent material

356391, G01N 2141

Patent

active

043414699

ABSTRACT:
Apparatus for producing a shadowgraph image of a transparent part to be examined, such as part of a video disc. The apparatus includes a source of coherent light, and an objective lens system for focusing the coherent light to produce a divergent beam, a concave mirror disposed in the path of the divergent beam, a transparent plate for supporting the disc to be examined in the aperture of the concave mirror, and a projection screen to receive light reflected from the concave mirror. The apparatus may also include plane mirrors to permit the projection screen to be positioned in a convenient location with respect to the disc being examined.

REFERENCES:
patent: 2958255 (1960-11-01), Dietrich
patent: 3964830 (1976-06-01), Ikeda et al.
patent: 4030835 (1977-06-01), Firester et al.

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