System for detecting variations in surface composition of an art

Details System for detecting variations in surface composition of an art System for detecting variations in surface composition of an art

1984-10-31

1987-02-24

Rosenberger, R. A.

Optics: measuring and testing

Refraction testing

356239, 356445, G01N 2155

Patent

active

046453377

ABSTRACT:
Surface inhomogeneities of a piece of glass are detected by disposing the glass piece in interfacial relation to an optical medium and reflecting light at a predetermined angle of incidence from the glass surface - optical medium interface along a scan path, through at least a portion of the optical medium. The optical medium is selected to have a refractive index equal to the bulk refractive index of the piece of glass. The intensity of the light reflected from the glass along the scan path is monitored to indicate surface inhomogeneities and the location thereof on the glass surface.

REFERENCES:
patent: 2780131 (1957-02-01), Lanneau et al.
patent: 3792930 (1974-02-01), Obenreder
patent: 3857637 (1974-12-01), Obenreder
patent: 3871773 (1975-03-01), Shaw
patent: 4536651 (1985-08-01), Bosse

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