REVIEW OF METHODS FOR DETERMINATION OF THERMAL EMISSIVITY

摘要

Thermal emissivity is a key parameter for modelling of the thermal environment of spacecrafts. The ECSS-Q-70-09 describes methods for the determination of thermal emittance following different approaches: Thermal test method Infrared spectrometer Portable equipment. Due to the fundamental principles the methods are based on, not exactly the same parameter is determined, some methods cover the hemispherical emittance ε{sub}h (thermal infrared), others the normal emittance ε{sub}n (portable equipment). Whereas ε{sub}h is more representative for modelling, ε{sub}n is the more common parameter being determined. Taking the ECSS-Q-70-09 as a baseline, results obtained by the different approaches are shown to establish the reliability and the most common sources of error of each method.