
A solarimeter is a pyranometer, a type of measuring device used to measure combined direct and diffuse solar radiation. An integrating solarimeter measures energy developed from solar radiation based on the absorption of heat by a black body. The principle this instrument was designed on was first developed by the Italian priest, Father Angelo Bel...
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http://en.wikipedia.org/wiki/Solarimeter

instrument for measuring solar radiation
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solarimeter, pyranometer 1. An instrument used to measure solar radiation. 2. General name for the class of actinometers that measure the combined intensity of incoming direct solar radiation and diffuse sky radiation.
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