Comparison of independent measurement results allows an assessment of the accuracy of the underlying methods. In this work, four multichannel filter radiometers were calibrated using tunable laser-illuminated and lamp-illuminated integrating sphere sources (ISSs). The determination of the radiance of the laser-illuminated ISS is based on electrical substitution radiometry at cryogenic temperatures and dimensional metrology of circular apertures. The determination of the spectral radiance of the lamp illuminated ISS is based on blackbody physics, referenced to the freezing temperature of gold. By calibrating the filter radiometers using both methods, we compare the detector-based to the source-based radiance scale at the National Institute of Standards and Technology (NIST).
Issue: No. 1
Pub Type: Journals
absolute radiometry, calibation, earth observing system, filter radiometers, integrating sphere sources, remote sensing spectral radiance