NDLI: Primary Radiometry for the Mise-en-Pratique for the Definition of the Kelvin: The Hybrid Method

Content Provider	Springer Nature Link
Author	Woolliams, E. R. Dury, M. R. Burnitt, T. A. Alexander, P. E. R. Winkler, R. Hartree, W. S. Salim, S. G. R. Machin, G.
Copyright Year	2011
Abstract	A task group of CCT-WG5 (radiation thermometry) was established in May 2008 to write text for the mise-en-pratique for the definition of the kelvin (MeP-K) for high temperatures. This task group reviewed and gave summaries for the existing techniques for filter radiometry as a means of determining the absolute radiance, and hence the thermodynamic temperature of a blackbody source. Three approaches were described—the radiance method, which calibrates the radiation thermometer for radiance responsivity, the irradiance method, which calibrates a filter radiometer for irradiance responsivity and then measures the source through two apertures, and the hybrid method that introduces a lens to the irradiance method. In the “hybrid method” the radiation thermometer consists of a filter radiometer, a double aperture system, and a lens. The lens allows the instrument to view a small area blackbody source. The system is calibrated “in parts”—i.e., the filter radiometer is calibrated for irradiance responsivity, and the transmittance of the lens and the geometric factor are determined separately. The main drawbacks of this single lens instrument are its high size-of-source effect (~0.2 %), and that this effect has to be determined in an “absolute” sense—relative to a theoretical infinite source. However, although the correction is large, with careful evaluation, the associated uncertainty can be made sufficiently small to measure the temperature of fixed-point cell transitions with low uncertainties. This article reviews the hybrid method and gives a comprehensive discussion of the associated uncertainty components.
Starting Page	1
Ending Page	11
Page Count	11
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	32
Issue Number	1-2
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2011-02-08
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Filter radiometry High temperatures MeP-K Thermodynamic temperature Physical Chemistry Industrial Chemistry/Chemical Engineering Mechanics Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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