Abstract
Validation of the various NRC blackbody sources below 962 °C has been hampered by the lack of a radiation thermometer with sufficient sensitivity and adequately small target size. Recently, progress was made in this area by having access to a NIST RT1550, a radiation thermometer operating at 1.55 μm with a thermoelectrically cooled InGaAs detector, a 3 mm nominal target size, a measuring range of 150 °C to 1064 °C, and a noise-equivalent temperature of 0.5 mK at 420 °C. Having the RT1550 for several months allowed sufficient time to intercompare our various blackbodies, both fixed-point and variable-temperature. It is these intralaboratory comparison results that are reported here.
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