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Calibration of Radiation Thermometers up to \(3000\,^{\circ }\hbox {C}\): Effective Emissivity of the Source

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Abstract

The growing demand of industry for traceable temperature measurements up to \(3000\,^{\circ }\hbox {C}\) encourages improvement of calibration techniques for industrial-type radiation thermometers in this temperature range. High-temperature fixed points can be used at such high temperatures, but due to the small diameter of apertures of their cavities (\({\sim }\)3 mm), they are not adapted for the large field-of-views commonly featured by this kind of radiation thermometers. At LNE-Cnam, a Thermo Gauge furnace of 25.4 mm source aperture diameter is used as a comparison source to calibrate customers’ instruments against a reference radiation thermometer calibrated according to the ITS-90 with the lowest uncertainties achievable in the Laboratory. But the furnace blackbody radiator exhibits a large temperature gradient that degrades its effective emissivity, and increases the calibration uncertainty due to the lack of information on the working spectral band of the industrial radiation thermometer. In order to estimate the corrections to apply, the temperature distribution (radial and on-axis) of the Thermo Gauge furnace blackbody radiator was characterized and the effective emissivity of the Thermo Gauge cavity was determined by three different methods. Because of this investigation, the corrections due to different fields of view and due to the different spectral bands of the reference pyrometer and the customer’s pyrometer were obtained and the uncertainties on these corrections were evaluated.

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Acknowledgments

This work was supported by Laboratoire National de Métrologie et d’Essais et Conservatoire National des Arts et Métiers in the framework of the French Metrology Programme.

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Authors and Affiliations

  1. Laboratoire Commun de Métrologie LNE-CNAM, La Plaine Saint-Denis, France

    O. Kozlova, S. Briaudeau, L. Rongione, F. Bourson, S. Guimier, S. Kosmalski & M. Sadli

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  1. O. Kozlova
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  2. S. Briaudeau
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  3. L. Rongione
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  4. F. Bourson
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  5. S. Guimier
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  6. S. Kosmalski
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  7. M. Sadli
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Correspondence to O. Kozlova.

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Kozlova, O., Briaudeau, S., Rongione, L. et al. Calibration of Radiation Thermometers up to \(3000\,^{\circ }\hbox {C}\): Effective Emissivity of the Source. Int J Thermophys 36, 1726–1742 (2015). https://doi.org/10.1007/s10765-015-1867-6

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  • DOI: https://doi.org/10.1007/s10765-015-1867-6

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