A low background radiometric calibration facility (LBRCF) consists of chambers and blackbodies
and it features modular structure and optical deflection. The modular structure enables LBRCF to perform several functions
such as radiator calibration
radiometer calibration and radiometric tracing to the source. In LBRCF
standard radiation
reference radiation and the radiation under calibration are coaxial by optical deflection
and the use of large-scale sliding tables is therefore avoided. During operation
LBRCF can be pumped to a vacuum level of 1.33×10
-2
Pa (10
-4
mmHg). With liquid nitrogen filled
the background temperature of LBRCF is below 80K. All these characteristics enables LBRCF to do spectroradiometry calibration in the target temperature range -60℃ to 80℃.
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references
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