Water Flow Pyrheliometer

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Water Flow Pyrheliometer

</dt>
An absolute pyrheliometer, developed by C. G. Abbot, in which the radiation-sensing element is a blackened water calorimeter. </dd>
It consists of a cylinder blackened on the interior and surrounded by a special chamber through which water flows at a constant rate. The temperatures of the incoming and outgoing water, which are monitored continuously by thermometers, are used to compute the intensity of the radiation. This instrument is used by the Smithsonian Institution as its standard instrument. </dd>

References

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