26 September 1989 A Further Intercomparison Of Two Cryogenic Radiometers
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Two cryogenic radiometers (electrical substitution radiometers cooled to liquid helium temperatures) have been developed at NPL. The first was used to realise thermodynamic temperature and to determine the Stefan-Boltzmann constant. The latter measurement confirmed the calculation that the radiometer is an absolute instrument with an uncertainty of 0.02%. The second radiometer was dedicated to optical radiation measurements with a calculated uncertainty of 0.005%. This paper describes and presents results of the intercomparison of the two radiometers by comparing the spectral responsivity of silicon photodiodes as independently determined by the radiometers.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
N. P. Fox, N. P. Fox, J. E. Martin, J. E. Martin, } "A Further Intercomparison Of Two Cryogenic Radiometers", Proc. SPIE 1109, Optical Radiation Measurements II, (26 September 1989); doi: 10.1117/12.960725; https://doi.org/10.1117/12.960725

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