NDLI: An Attempt to Simplify the Determination or the Size-of-Source Effect in Radiation Thermometers

Content Provider	Springer Nature Link
Author	Rodríguez Arteaga, H. Cárdenas García, D.
Copyright Year	2017
Abstract	The knowledge of $$\sigma _{d}$$ , the parameter that measures the size-of-source effect of a radiation thermometer, as a function of the diameter d of a radiation source is mandatory to estimate the appropriate corrections to temperature values measured when aiming to radiation sources of different sizes. To obtain $$\sigma _{d}$$ as a function of d is a complicated task because there is no universally recognized mathematical function that relates them. The direct method to evaluate $$\sigma _{d}$$ usually requires a radiation source of appropriate size and a set of many diaphragms with increasing diameter. How good is the approximation to $$\sigma _{d}$$ estimated in this way depends on the number of diaphragms used. To reduce the time and cost to evaluate $$\sigma _{d}$$ , it is desirable to have methods that provide good approximations with a reduced number of diaphragms. In this paper, we present a method to obtain an approximation to $$\sigma _{d}$$ as a function of d with a limited number of diaphragms. When using this method, deviations of less than $$1\;{^{\circ }}\hbox {C}$$ are obtained when measuring radiance temperatures of $$500\;{^{\circ }}\hbox {C}$$ , between the measured temperatures and those calculated from values of $$\sigma _{d}$$ . We also propose a simple equation to interpolate approximated values of $$\sigma _{d}$$ for those diameters between those used in its evaluation, but a limitation is that $$\sigma _{d}$$ must be bigger than 0.98.
Starting Page	1
Ending Page	9
Page Count	9
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	38
Issue Number	7
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2017-05-11
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Radiation thermometer Size-of-source effect calculation Size-of-source effect function Condensed Matter Physics Classical Mechanics Industrial Chemistry/Chemical Engineering Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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