A pyrgeometer is a device that measures the atmospheric infra-red radiation spectrum that extends approximately from 4.5 µm to 100 µm. Where all the variables have the same meaning as before. As a result, the detected voltage and instrument temperature yield the total global long wave downward radiation. == Usage == Pyrgeometers are frequently u...
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http://en.wikipedia.org/wiki/Pyrgeometer
instrument for measuring radiation from earth
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An instrument that measures radiation from the earth's surface into space.
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https://www.encyclo.co.uk/local/20128
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