SpectralEmissivity & Emittance

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ASTM E307 – 72(2008) Standard Test Method for Normal Spectral Emittance

At Elevated Temperatures
Developed by ASTM Subcommittee: E21.04, on Space Simulation Test Methods, and in the Annual Book of ASTM Standards, Volume 15.0 Space Simulation; Aerospace and Aircraft; Composite Materials

Quoting from the standard’s Scope:

1. Scope

1.1 This test method describes a highly accurate technique for measuring the normal spectral emittance of electrically conducting materials or materials with electrically conducting substrates, in the temperature range from 600 to 1400 K, and at wavelengths from 1 to 35 ?m.

1.2 The test method requires expensive equipment and rather elaborate precautions, but produces data that are accurate to within a few percent. It is suitable for research laboratories where the highest precision and accuracy are desired, but is not recommended for routine production or acceptance testing. However, because of its high accuracy this test method can be used as a referee method to be applied to production and acceptance testing in cases of dispute…

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NFRC 301-2004: Standard Test Method for Emittance of Specular Surfaces…

NFRC 301-2004: Standard Test Method for Emittance of Specular Surfaces Using Spectrometric Measurements(Downloadable in PDF Format )
“1 Scope”

“This test method determines the normal and hemispherical emittance of a specular
surface. This test method describes the spectrometric measurement of the near-normal
specular reflectance in the mid-infrared range from mid-infrared 5 to 25 um. It includes
the calculation procedures required to determine the normal and hemispherical
emittance of said object.

This test method includes calibration instructions for the spectrometer and procedures
for selecting reflectance-reference standards.”…

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