Convection Free Instrument for Measuring Infrared Radiation in the Atmosphere

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Abstract
The instrument described is a null type device which measures the equivalent blackbody radiation temperature in the atmosphere at night by supplying electrical power to the absorber surface to replace the net loss of energy by radiation and keep the surface at the ambient air temperature. Thus convection effects are eliminated. A thermopile is used to detect the absorber surface temperature difference from air and provide a signal to the high gain transistor dc amplifier of the servo system. Apparatus is also described which was useful in the development of the instrument and in verifying its theoretical calibration.

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