Optics: measuring and testing – Inspection of flaws or impurities – Bore inspection
Patent
1975-02-27
1976-09-21
Corbin, John K.
Optics: measuring and testing
Inspection of flaws or impurities
Bore inspection
250206, 356225, 356226, G01N 2122
Patent
active
039815919
ABSTRACT:
In an automatic photometer for metering light from a sample to be measured which includes a light source for illuminating the sample and an objective for focusing the light passed from the light source through the sample, a slit is positioned closely adjacent the focal plane of the objective and has an opening providing a central area and an outer area surrounding the central area. Two light receiving elements are disposed to receive the light passed through the central and outer areas of the slit, respectively, and means are provided for effecting photometry under selected conditions of light reception by the light receiving elements.
REFERENCES:
patent: 3711209 (1973-01-01), Caspersson et al.
Corbin John K.
Evans F. L.
Nippon Kogaku K.K.
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