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Approximating the ITS-90 between Zinc and Copper with an Infrared Thermometer at NIS-Egypt

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Abstract

This paper presents an approximation to the International Temperature Scale of 1990 (ITS-90) between the Zn (420 °C) and Cu (1085 °C) fixed points using a 900 nm narrow-band radiation thermometer. This thermometer has a 400 mm working distance and a 150 mm objective focal length. An image of the measured target is focused by the objective lens onto a 1 mm aperture (drilled mirror). The light passing through the aperture is conveyed by a condenser lens through an interference filter with a nominal central wavelength of 900 nm and a half-bandwidth of 10 nm before reaching a silicon photodiode working in the photovoltaic mode. The thermometer was calibrated at the Zn, Al, Ag, and Cu blackbody fixed points. The results of the calibration were used to determine the constants A, B, and C of the Sakuma-Hattori interpolation equation. The results showed that the ITS-90 can be approximated within ± 0.051 °C throughout the Zn-Cu interval when the thermometer is calibrated at the Zn, Al, Ag, and Cu fixed points.

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Authors and Affiliations

  1. Thermal Metrology Laboratory, National Institute of Standards, Giza, Egypt

    M. G. Ahmed & K. Ali

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  1. M. G. Ahmed
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  2. K. Ali
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Correspondence to K. Ali.

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Ahmed, M.G., Ali, K. Approximating the ITS-90 between Zinc and Copper with an Infrared Thermometer at NIS-Egypt. Int J Thermophys 30, 124–130 (2009). https://doi.org/10.1007/s10765-008-0450-9

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  • DOI: https://doi.org/10.1007/s10765-008-0450-9

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