NDLI: Size-of-Source Effect Difference Between Direct and Indirect Methods of Radiation Thermometers

Content Provider	Springer Nature Link
Author	Hao, X. Yuan, Z. Lu, X. Zhao, W.
Copyright Year	2011
Abstract	The size-of-source effect (SSE) of radiation thermometers is generally determined using direct and indirect methods. The present paper describes the difference in the SSE obtained using the two methods. Three thermometers at different SSE levels, namely, 1.5 × 10$^{−4}$, 1.05 × 10$^{−3}$, and 2.44 × 10$^{−3}$, are selected. SSEs with 5 mm to 96 mm aperture diameters are higher in the indirect than in the direct method. Three factors contribute to this difference: the light reflection from the inside face and edge of the aperture to the black spot, the relay reflections from the thermometer and background, and the decreased radiance caused by obstruction of light by a black spot. Thus, the difference in the SSEs results from the difference in the principle of the two methods and not from the SSE levels of the thermometers themselves. The difference is negligible to be considered in a number of radiation thermometers, but they must be taken into consideration in top-level intercomparisons.
Starting Page	1655
Ending Page	1663
Page Count	9
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	2011-08-06
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Direct method Indirect method Radiation thermometer Size-of-source effect Industrial Chemistry/Chemical Engineering Physical Chemistry Mechanics Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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