The sizeofsource effect correction under eccentric aiming
Abstract
Eccentric aiming is a common and general form in radiation thermometry. In such case, the correction of the sizeofsource effect (SSE) is different from that under central aiming, under which the SSE has been characterized and can be easily corrected. The present article studies the eccentric SSE model on a polar coordinate, and the calculation of eccentric SSE requires integration. A polynomial is employed, as an approximation instead of an unintegrable item in the model under eccentric aiming to a circle radiation source, to obtain quasianalytical solutions of the general and specific eccentric SSE functions. The characteristics of eccentric SSE are discussed, and examples of SSE calculation and correction are given. The SSE caused by eccentric aiming in measurements, such as distribution measurements, should be corrected or accounted in uncertainty for high accuracy of measurements, and can be corrected using the quasianalytical solutions for circle source.
 Publication:

Temperature: its Measurement and Control in Science and Industry, Volume 8
 Pub Date:
 September 2013
 DOI:
 10.1063/1.4819616
 Bibcode:
 2013AIPC.1552..637Y
 Keywords:

 measurement uncertainty;
 polynomial approximation;
 temperature measurement;
 thermometers;
 07.20.Dt;
 Thermometers