Process and apparatus for detecting inclusions

Details Process and apparatus for detecting inclusions Process and apparatus for detecting inclusions

1975-09-12

1977-09-20

Evans, F. L.

Optics: measuring and testing

Crystal or gem examination

356239, G01N 2132

Patent

active

040493504

ABSTRACT:
A process and apparatus for detecting inclusions in precious stones in which the stone is scanned with light from a laser. The stone is immersed in a liquid of the same refractive index as the stone so that there is no reflection from the outer surfaces of the stone, so that the shape of the stone does not affect the process.

REFERENCES:
patent: 3586444 (1971-06-01), Sproul et al.
patent: 3609380 (1971-09-01), Shaw, Jr.
patent: 3867032 (1975-02-01), Bruck

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