FAR INFRARED ATMOSPHERIC TRANSMISSION$^{\ast}$
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Date
1952
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Ohio State University
Abstract
Measurements of the transmission of the atmosphere have been made in this laboratory for path lengths up to 50 feet in the wavelength region, 100 to 600 microns. These measurements show rapidly diminishing absorption by atmospheric water vapor at the longer wavelengths and raise the question of the feasibility of detecting solar radiation at wavelengths around one millimeter. The solar radiation was detected with a telescope which consisted of a twenty-four-inch searchlight mirror, a Golay detector at its focus, and black paper filters. The amount of incident flux from the sun was estimated by comparison to that received from a black body source. A transmission echellette grating was used to obtain the spectrum of the solar radiation. It was found that the radiation consists of a band which extends from one to two millimeters wavelength, with a maximum at 1.5 mm.
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Author Institution: Physics Department, The Johns Hopkins University