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Proceedings Paper

A Further Intercomparison Of Two Cryogenic Radiometers
Author(s): N. P. Fox; J. E. Martin
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Paper Abstract

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.

Paper Details

Date Published: 26 September 1989
PDF: 9 pages
Proc. SPIE 1109, Optical Radiation Measurements II, (26 September 1989); doi: 10.1117/12.960725
Show Author Affiliations
N. P. Fox, Division of Quantum Metrology, NPL (United Kingdom)
J. E. Martin, Division of Quantum Metrology, NPL (United Kingdom)

Published in SPIE Proceedings Vol. 1109:
Optical Radiation Measurements II
James M. Palmer, Editor(s)

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