Abstract
The spectral-irradiance scale in the infrared at the National Research Council of Canada is being realized using electrical-substitution absolute radiometers in conjunction with interference filters to calibrate FEL tungstenhalogen lamps as primary source standards. This paper discusses some preliminary measurements associated with the second phase of this work, the realization of a scale in the range 1500 nm to 2400 nm. Some characteristics of the spectroradiometer that will be used to measure the transmittance of the interference filters under conditions as close as possible to the final configuration are presented. Various problems encountered in configuring the liquid-nitrogen-cooled InSb detector used are discussed. The larger effect of atmospheric water absorption bands in this wavelength range presents a greater challenge in determining the choice of passband wavelengths for the filters. Measurements to determine the extent of these absorption bands are presented.
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