This article has an erratum: [https://doi.org/10.1051/ijmqe/2023007]
Int. J. Metrol. Qual. Eng.
Volume 14, 2023
|Number of page(s)||10|
|Published online||01 May 2023|
Characterizing a linear pyrometer at the National Metrology Institute of South Africa
National Metrology Institute of South Africa (NMISA), Private Bag X34, Lynnwood Ridge, Pretoria 0040, South Africa
* Corresponding author: firstname.lastname@example.org
Accepted: 8 March 2023
A linear pyrometer is used to realize the International Temperature Scale of 1990 (ITS-90) for temperature ranges above 961.78 °C in most National Metrology Institute (NMI) radiation thermometry labs. The different components of the linear pyrometer system working together to measure temperature may exhibit some errors which should be accounted for. The errors can be characterized by several equipment parameters that should be measured before the radiation thermometer is used to realize ITS-90 temperatures. Relative spectral responsivity (s), size of source effect (SSE), gain ratio (GR), non-linearity (NL), distance effect (DE), temperature coefficient and zero drift are all major equipment parameters that characterize the efficiency of a linear pyrometer in realizing ITS-90. In this work, an attempt was made to describe and demonstrate these major parameters by using actual measured characterization results of a linear pyrometer. Uncertainty contributions from some of the parameters considered in scale realizations was also demonstrated using the measurement results.
Key words: Radiation / Planck / pyrometer / spectral / responsivity and gain
Note to the reader: Following the publication of the Erratum Int. J. Metrol. Qual. Eng. 14, 6 (2023) https://doi.org/10.1051/ijmqe/2023007, the equation 1 has been corrected on 9 June 2023.
© E.K. Ejigu, Published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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