Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1986-08-21
1988-01-12
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
356226, G01J 100
Patent
active
047193441
ABSTRACT:
A method for measuring the amount of direct solar radiation and an apparatus according to the method. The invention provides a light sensor which rotates at a constant speed while scanning the sky including the sun. The differential coefficient of the radiation received is obtained from the output of the light-receiving element, thus substantially eliminating the scattered light component from the output. The preferred embodiment of the light-receiving element is a pyroelectric detector.
REFERENCES:
patent: 4262195 (1981-04-01), White et al.
patent: 4491727 (1985-01-01), Appelbaum et al.
Eko Instruments Trading Co., Ltd.
Westin Edward P.
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