ASTM E408-71(2008)

Standard Test Methods for Total Normal Emittance of Surfaces Using Inspection-Meter Techniques

STANDARD published on 1.5.2008

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The information about the standard:

Designation standards: ASTM E408-71(2008)
Note: WITHDRAWN
Publication date standards: 1.5.2008
SKU: NS-46701
The number of pages: 3
Approximate weight : 9 g (0.02 lbs)
Country: American technical standard
Category: Technical standards ASTM

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Annotation of standard text ASTM E408-71(2008) :

Keywords:

emittance, infrared emittance, material radiative property, normal emittance, radiative heat transfer, spacecraft thermal control, thermal radiation, Emittance, Infrared (IR) analysis--aerospace materials/applications, Infrared spectroscopy, Thermal radiation, ICS Number Code 17.040.20 (Properties of surfaces)

Additional information

1. Scope

1.1 These test methods cover determination of the total normal emittance (Note) of surfaces by means of portable, inspection-meter instruments.

Note 1—Total normal emittance (ε_N) 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 ε_N to wavelength and spectral normal emittance [ε_N (λ)] is

where:
L _b(λ, T)	=	Planck's blackbody radiation function = c₁π ⁻¹λ⁻⁵(e^c₂/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,
L_b(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.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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