Using a high-temperature blackbody (HTBB) and filter radiometers calibrated for absolute spectral power response, the spectral output of the blackbody, whose radiance temperature was determined using the filter radiometers, was used to assign spectral radiance to tungsten-strip lamps with a prism-grating monochromator. The spectral radiance of the HTBB was also determined using signal ratios to a tungsten-strip lamp calibrated using a scale derived from the radiometric temperature determination of a gold freezing-point blackbody. The radiance temperatures found using the two methods were in agreement to 0.5 K near 2900 K, and from 260 nm to 1050 nm, the spectral radiance of the HTBB did not differ more than 0.5% in radiance from a single temperature Planck's law.
Issue: No. 5
Pub Type: Journals
absolute radiometry, blackbody, radiance temperature, spectral radiance scale, thermodynamic temperature