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Comparison of two cryogenic radiometers by determining the absolute spectral responsivity of silicon photodiodes with an uncertainty of 0.02%

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Abstract

To substantiate the NPL primary standard cryogenic radiometer as an absolute instrument it has been compared with the cryogenic radiometer which was successfully used to determine the Stefan-Boltzmann constant. The comparison was carried out with an accuracy of better than 0.02% by the independent determination of the spectral responsivity of silicon photodiodes with each radiometer. Only a detector comprising a number of silicon photodiodes (a trap device) had the required stability to achieve the desired accuracy. Four trap devices were found to have near unity internal quantum efficiency, being self-consistent to within 0.01%.

© 1990 Optical Society of America

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