Our current spectral radiance and irradiance scales are derived from the radiance temperature determination of a blackbody at the freezing point of gold (GPBB) at 1337.33 K. The standard lamps disseminated for spectral irradiance have spectral outputs similar to a 3000 K high-temperature blackbody (HTBB) for calibration needs in the ultraviolet and the visible wavelength regions. The large differences in the spectral output between the current beginning point of the scale and the final product leads to large uncertainties in the values assigned to the lamps. With a HTBB at 3000 K and a method of determining radiance temperatures directly without relying on the GPBB, the final uncertainties in the spectral emission scales can be substantially reduced.
Citation: Determination of Radiance Temperatures Using Detectors Calibrated for Absolute Spectral Power Responsivity
Pub Type: Others
blackbody, high-temperature blackbody, HTBB, radiance temperature, spectral emission scales, spectral irradiance, spectral radiance