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Standard Test Method for Normal Spectral Emittance at Elevated Temperatures of Nonconducting Specimens
Automatische name übersetzung:
Standard Test Method for normal Spektralstrahlung bei erhöhten Temperaturen von nichtleitende Proben
NORM herausgegeben am 19.3.1971
Bezeichnung normen: ASTM E423-71(2002)
Anmerkung: UNGÜLTIG
Ausgabedatum normen: 19.3.1971
SKU: NS-46734
Zahl der Seiten: 9
Gewicht ca.: 27 g (0.06 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Keywords:
emittance, infrared emittance, material radiative property, radiative heat transfer, spacecraft thermal control, spectral normal emittance, thermal radiation, ICS Number Code 49.025.01 (Materials for aerospace construction in general)
1. Scope | ||
1.1 This test method describes an accurate technique for measuring the normal spectral emittance of electrically nonconducting materials in the temperature range from 1000 to 1800 K, and at wavelengths from 1 to 35 m. It is particularly suitable for measuring the normal spectral emittance of materials such as ceramic oxides, which have relatively low thermal conductivity and are translucent to appreciable depths (several millimetres) below the surface, but which become essentially opaque at thicknesses of 10 mm or less. 1.2 This test method requires expensive equipment and rather elaborate precautions, but produces data that are accurate to within a few percent. It is particularly suitable for research laboratories, where the highest precision and accuracy are desired, and is not recommended for routine production or acceptance testing. Because of its high accuracy, this test method may be used as a reference method to be applied to production and acceptance testing in case of dispute. 1.3 This test method requires the use of a specific specimen size and configuration, and a specific heating and viewing technique. The design details of the critical specimen furnace are presented in Ref (1), and the use of a furnace of this design is necessary to comply with this test method. The transfer optics and spectrophotometer are discussed in general terms. 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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2. Referenced Documents | ||
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