Abstract:Abstract. Many National Metrology Institutes (NMIs) realise the spectral irradiance scale by obtaining traceability from a cryogenic radiometer through the use of calibrated filter radiometers. The filter radiometers are used to determine the temperature of a high temperature black body which is then used as a reference source, which spectral radiance can be determined from Planck's equation. The uncertainty of the temperature measurement makes the most significant contribution to the uncertainty of realising … Show more
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