Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-07-15
1990-06-12
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250239, 2502031, 356152, H01J 502, H01J 516
Patent
active
049335502
ABSTRACT:
A photodetector system for producing electrical signals responsive to the orientation of a light source, such as the sun, with respect thereto utilizes a diffuser to eliminate position-dependent sensitivities of the photocathode. The extent to which the diffuser or the photocathode itself is exposed to the incident radiation can be controlled by a shroud or by applying an absorptive coating in a predetermined pattern on an absorber cap, or on the diffuser directly. The shroud, by its configuration and its height above the photodetector, defines the range of angles of elevation and azimuth at which the diffuser can be illuminated. Such angles can also be controlled with printed or sprayed-on markings on the diffuser or absorber cover which form an opaque coating so as to prevent light transmission over predetermined regions. A fine dot pattern may be applied to the diffuser or the absorber cover, so that only partial transmission of the light can be achieved therethrough. The absorber cover may be provided with a light absorbing coloration or dye therethrough, and have a predetermined variation in thickness, so that the amount of light transmitted therethrough is responsive to the thickness at the point of incidence of the light.
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