Evaluation of a commercial, portable, ambient‐temperature emissometer
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The DevicesS an uncertainty of ±0.014 units was determined. These repeatability and accuracy values were confirmed by a round‐robin investigation using two working standards whose e’s were measured by three independent laboratories using model AE emissometers and by four laboratories that used absolute methods. The instrument was shown to measure the total hemispherical e, not the total normal e. Experimental difficulties were encountered during measurements on a very anisotropic material and in determinations of e’s of materials with transpare...
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