Abstract
We describe the design and measured electrical performance of the first electrical substitution radiometer based on superconducting thermometers. Prospective applications emphasize high precision measurement of low power, mid- and far-IR blackbody radiation. The minimum noise floor for a single measurement of substitution power was 2 pW for an integration time of 2.7 s. For an extended series of experiments covering a range of substitution power from 0.5 nW to 5 μW, the noise floor can be roughly approximated as 4 pW plus 7×10−6 times the measured power. Analysis of the results indicates the precision is limited by a combination of thermal parasitics and electronic noise contributions.
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