ASTM E408-71(2008)
Standard Test Methods for Total Normal Emittance of Surfaces Using Inspection-Meter Techniques
- Standard No.
- ASTM E408-71(2008)
- Release Date
- 1971
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- Replace By
- ASTM E408-13
- Latest
- ASTM E408-13(2019)
- Scope
1.1 These test methods cover determination of the total normal emittance (Note) of surfaces by means of portable, inspection-meter instruments.
Note 18212;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
where: L b(λ, T) = Planck''s blackbody radiation function = c1π −1λ−5(ec2/λT − 1)−1, c1 = 3.7415 × 10−16 W·m 2, c2 = 1.4388 × 10−2 m·K, T = absolute temperature, K, λ = wavelength, m, 
Lb(λ, T)dλ = Δπ −1T4, and Δ = Stefan-Boltzmann constant = 5.66961 × 10 −8 W·m2·K−4 1.2 These test methods are intended for measurements on large surfaces when rapid measurements must be made and where a nondestructive test is desired. They are particularly useful for production control tests.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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ASTM E408-71(2008) history
- 2019 ASTM E408-13(2019) Standard Test Methods for Total Normal Emittance of Surfaces Using Inspection-Meter Techniques
- 2013 ASTM E408-13 Standard Test Methods for Total Normal Emittance of Surfaces Using Inspection-Meter Techniques
- 1971 ASTM E408-71(2008) Standard Test Methods for Total Normal Emittance of Surfaces Using Inspection-Meter Techniques
- 1971 ASTM E408-71(2002) Standard Test Methods for Total Normal Emittance of Surfaces Using Inspection-Meter Techniques
- 1971 ASTM E408-71(1996)e1 Standard Test Methods for Total Normal Emittance of Surfaces Using Inspection-Meter Techniques