Optics: measuring and testing – By shade or color – With color transmitting filter
Patent
1984-03-21
1986-11-25
McGraw, Vincent P.
Optics: measuring and testing
By shade or color
With color transmitting filter
250210, 356446, G01J 351, G01N 2127
Patent
active
046245723
ABSTRACT:
Spectrophotometric apparatus is incorporated in a portable housing with a light source for emitting a wide band of radiation from which monochromatic light is produced and projected onto a specimen outside the housing. A hood is mounted to the housing and includes an aperture through which light is emitted from the light source and reflected from either a specimen or a calibrating material positioned in front of the aperture such that light is reflected from either the specimen or the calibrating material onto a photosensitive detector within the housing. The photosensitive detector is responsive to the monochromatic light reflected from the specimen or the calibrating material to provide output signals representative of the spectrophotometric characteristics thereof. The output of the photosensitive detector is connected to an indicating meter.
REFERENCES:
patent: 2451501 (1948-10-01), Liben
patent: 3421821 (1969-01-01), Alessi
patent: 3846027 (1974-11-01), Hyman et al.
patent: 4082458 (1978-04-01), Fukui et al.
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