Abstract
The low-background infrared (LBIR) facility at the US National Institute of Standards and Technology (NIST) has been calibrating infrared test chambers that are used to calibrate spacebased remote sensors. These test chambers typically operate at temperatures of 20 K to 80 K and have collimators in them to simulate faint objects at great distances in a low-background environment. Since 2001 the LBIR facility has used a transfer radiometer, the BXR, to calibrate nine IR test chambers. The BXR has shown that the output of these chambers can differ from the modelled output by ±10%. In this paper the methodology of the BXR calibration activity will be described along with specific examples to highlight important calibration performance parameters of the BXR and of other hardware in the calibration chain from the primary standard.
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