Contents

Section 1. Topics on theoretical electrodynamics

MEASUREMENT OF INTEGRAL EMISSION COEFFICIENTS OF MATERIALS HEATED TO TEMPERATURES FROM 50 TO 250 ºС

A. S. Ilyin, A. V. Gusev, K. A. Mailyan, A. V. Glushchenkov, A. V. Kiselev, A. V. Kachanov

Abstract 

The device of a measuring stand for determining the integral radiation coefficient of materials heated from 50 to 250 ºС is considered. The calculation of the NSP errors characteristic of this stand was carried out. The values of the signals from the receiver are calculated depending on the temperature of the mast, the method of measuring and processing signals from the receiver and from the surface under study is presented. The calculation of the
error in determining the ET is given, in accordance with GOST R 8.736-2011, as well as the results of measurements of the sample coated with paint with high absorption capacity and a copper plate with a surface treated by sandblasting. For “black” coatings, a measurement error of ± 5% was obtained, and for coatings with a higher reflectivity up to ± 10%. The methods allowing to reduce the measurement error of the integral radiation coefficient to 2-3% are consider.

Keywords: integral radiation coefficient of the ТИ, model of the absolutely black body, non–selective receiver with a cone receiving element, radiation  method for determining the ТИ, non-excluded systematic error, boundary of the basic error, CКО - mean square deviation

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