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

Content Provider	Springer Nature Link
Author	Kozlova, O. Briaudeau, S. Rongione, L. Bourson, F. Guimier, S. Kosmalski, S. Sadli, M.
Copyright Year	2015
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.
Starting Page	1726
Ending Page	1742
Page Count	17
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	36
Issue Number	8
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2015-03-20
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Blackbody source Emissivity High temperature Radiation thermometer calibration technique Thermal gradient Condensed Matter Physics Mechanics Industrial Chemistry/Chemical Engineering Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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