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US 4,719,344 AGranted
Method of and apparatus for measuring amount of solar radiation received directly
AssigneeEko Instruments Trading Co., Ltd.
InventorTozawa Hiroyuki
Life of this patent
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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.
Claims2
A method for measuring the amount of direct solar radiation, comprising the steps of:
- rotating a light sensor at a constant speed in a manner such that the light sensor scans the sky including the sun so as to receive both direct and scattered components of solar radiation;
- and obtaining the differential coefficient of electric outputs from the light sensor with respect to time so as to substantially eliminate the scattered component of the radiation received.
Dependencies are inferred from the claim text.