Woolliams, E R; Winkler, R; Salim, S G R; Harris, P M; Smith, I M (2009) The Double Wavelength Technique - an alternative technique to determine thermodynamic temperature. Int. J. Thermophysics, 30 (1). pp. 144-154.

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Abstract

Filter radiometry provides thermodynamic temperatures traceable to a cryogenic radiometer. An alternative technique is possible that provides absolute thermodynamic temperature through a different traceability chain, with the radiometric measurements purely relative. If this technique could be experimentally realised with similar uncertainties to those associated with filter radiometry, then this would provide a metrologically valuable ¿second opinion¿ that would test for systematic effects common to all filter radiometry measurements.
This paper describes the theoretical analysis prior to an experimental investigation of this technique. This theoretical analysis implies that with Re-C and Cu as the two blackbodies, the Re-C temperature can be determined with an uncertainty of around twice that expected with filter radiometry. For higher temperature metal-carbide carbon eutectics, the uncertainty difference would be smaller.

Item Type:	Article
Keywords:	eutectic, fixed-points, thermodynamic temperature
Subjects:	Optical Radiation and Photonics Optical Radiation and Photonics > Radiometry and Detectors
Last Modified:	02 Feb 2018 13:15
URI:	https://eprintspublications.npl.co.uk/id/eprint/4320