Ralph Stair

  • Citations Per Year
Learn More
Measurements on the spectral energy distribution of direct solar radiation, made in July 1953, at Sacramento P eak, New Mexico, altitude 9,200 feet are described . Spectral data a re given for wavelengths extending from 299 to 535 millimicrons for ai r masses 0, 1.0,2.0, and 3.0. A determination of atmospheric transmittance as a function of wavelength(More)
Two spectroradiometers, one based on a conventional prism monochromator and the other on a system employing narrow band pass interference filters, have been set up and independently used in the determination of the spectral irradiances of a number of sources over the wavelength range from 0.25 micro to 2.5 micro. Basically, the method of calibration for(More)
The National Bureau of Standards standard of total irradiance as presently issued in the form of a 50-W carbon filament lamp was originally calibrated more than fifty years ago. Recently, needs for higher accuracy and wider ranges of total irradiance have necessitated the setting up of three sizes (100 W, 500 W, and 1000 W) of tungsten-filament lamp(More)
The measuremen t of the spectral emlSSlVl ty of heated substances may be accomplished by comparing the energy emitted by the substance under study 'with that emitted by a standard substance for radiation at various wavelengths. For such a standard one usually uses a blackbody, that is, a hollow body provided with a hole for viewing the radia tion inside.(More)