NDLI: Absolute Radiometry for the MeP-K: The Irradiance Measurement Method

Content Provider	Springer Nature Link
Author	Hartmann, Jürgen Anhalt, Klaus Taubert, Richard Dieter Hollandt, Jörg
Copyright Year	2011
Abstract	The “Mise en pratique for the definition of the kelvin” (MeP-K) as a guide for the realization of the kelvin is presently revised to incorporate the temperature scales in current use as the best formal approximations of the thermodynamic temperature and, additionally, direct methods of thermodynamic temperature measurement. Within the MeP-K, the CCT WG 5 “Radiation Thermometry” develops a document to facilitate the implementation of thermodynamic temperature measurements at temperatures above the silver fixed point (961.78 °C). Three thermodynamic temperature measurement methods, all relying on absolute spectral-band radiometry, are proposed. To make these techniques more accessible for the broader thermometry community, each of these methods is described in detail in an accompanying paper to the MeP-K. These descriptions shall not be understood as a restriction to other possible radiometric methods of thermodynamic temperature measurement. One of the methods of radiometric temperature measurement above the silver point is the absolute measurement of irradiance in a well-defined spectral band. This is a straightforward method, which relies on filter radiometers with known spectral irradiance responsivity and a well-defined observation geometry, without any imaging technique. It has been developed for thermodynamic temperature measurements of precision blackbodies as primary standards for radiometry and thermometry and for the investigation of the uncertainty of the ITS-90 as an approximation of the thermodynamic temperature over a period of nearly 20 years at PTB. The article describes the design of the applied filter radiometers, their calibration chain, and their long-term stability. Additionally, the details and requirements of the experimental procedure for obtaining thermodynamic temperatures with this method are presented. Finally, relevant results obtained with this method, which is also applicable for temperatures significantly below the silver fixed point, are reviewed.
Starting Page	1707
Ending Page	1718
Page Count	12
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	32
Issue Number	7-8
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2011-06-15
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	High-temperature fixed points Radiometry Thermodynamic temperatures Industrial Chemistry/Chemical Engineering Physical Chemistry Mechanics Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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Proposed Process for Estimating Definitive Temperatures of High-Temperature Fixed Points

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

Thermodynamic Temperatures of High-Temperature Fixed Points: Uncertainties Due to Temperature Drop and Emissivity

Development of High-Temperature Fixed Points of Unknown Temperature Suitable for Key Comparisons

Alternative Methods of Blackbody Thermodynamic Temperature Measurement Above Silver Point

Calibration of an Absolute Radiation Thermometer for Accurate Determination of Fixed-Point Temperatures

Evaluation and Selection of High-Temperature Fixed-Point Cells for Thermodynamic Temperature Assignment

The Double-Wavelength Technique—An Alternative Technique to Determine Thermodynamic Temperature

Uncertainties in the Realization of Thermodynamic Temperature Above the Silver Point

Absolute Radiometry for the MeP-K: The Irradiance Measurement Method

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