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ASTM E408 PDF
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Standard Test Methods for Total Normal Emittance of Surfaces Using Inspection-Meter Techniques
| Published by | Publication Date | Number of Pages |
| ASTM | 10/01/2019 | 5 |
ASTM E408 – Standard Test Methods for Total Normal Emittance of Surfaces Using Inspection-Meter Techniques
1.1 These test methods cover determination of the total normal emittance (Note 1) of surfaces by means of portable, as well as desktop, inspection-meter instruments.
Note 1: Total normal emittance (εN) is defined as the ratio of the normal radiance of a specimen to that of a blackbody radiator at the same temperature. The equation relating εN to wavelength and spectral normal emittance [εN(λ)] is
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