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Under practical experiment conditions the validity of the steady state calorimetric technique for measuring the total hemispherical emissivity of solid surfaces is analysed. The maximum theoretical error resulting from the grey body assumption is estimated. In order to avoid measurements of the surface temperature of nonmetallic samples, a new steady state calorimetric technique is developed. The effects of nonradiative heat losses and various geometric factors are also analysed in detail; their error formulae are exactly derived.
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Xia et al. (1993) studied this question.
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