Silver Disk Pyrheliometer

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Silver Disk Pyrheliometer

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An instrument used for the measurement of direct solar radiation. See pyrheliometer. </dd>
It is constructed in the following manner. A silver disk located at the lower end of a diaphragmed tube serves as the radiation receiver for a calorimeter. Radiation falling on the silver disk is periodically intercepted by means of a shutter located in the tube, causing temperature fluctuations of the calorimeter which are proportional to the intensity of the radiation. The instrument is normally used as a secondary instrument and is calibrated against the water-flow pyrheliometer. It is used by the U.S. Weather Bureau as a standard instrument. </dd>

References

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