Optics: measuring and testing – Photometers – Photoelectric
Patent
1979-12-03
1981-11-10
Corbin, John K.
Optics: measuring and testing
Photometers
Photoelectric
354 59, 356 51, G01J 142
Patent
active
042994683
ABSTRACT:
A photoelectric radiometer structured to generate an output signal that can be used to predict an exposure value for a photographic scene as based on the magnitude of the radiometer output signal. The radiometer is provided with a preferred relative spectral sensitivity in the visible and near infrared regions of the spectrum to minimize exposure errors which otherwise can occur with certain types of high contrast scenes which contain objects that have widely different visible reflectivities. A positive lens collects radiation from a scene and directs it onto the surface of a silicon photodiode which in turn provides the output signal. The spectral sensitivity of the photodiode is suitably altered, e.g., with a filter, to provide the radiometer preferred relative spectral sensitivity.
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Manning Monis J.
Plummer William T.
Arnold Bruce Y.
Caufield Francis J.
Corbin John K.
Polaroid Corporation
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