Pyrheliometer

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Pyrheliometer

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An actinometer which measures the intensity of direct solar radiation, consisting of a radiation sensing element enclosed in a casing which is closed except for a small aperture, through which the direct solar rays enter, and a recorder unit. See Angstrom compensation pyrheliometer, silver-disk pyrheliometer, water-flow pyrheliometer, Eppley pyrheliometer, spectropyrheliometer, Michaelson actinograph. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use