Total hemispherical emittance measured at high temperatures by the calorimetric method
Conference
·
OSTI ID:10180587
- Case Western Reserve Univ., Cleveland, OH (United States)
- Lewis Research Center, Cleveland, OH (United States)
- Cleveland State Univ., OH (United States)
A calorimetric vacuum emissometer (CVE) capable of measuring total hemispherical emittance of surfaces at elevated temperatures was designed, built, and tested. Several materials with a wide range of emittances were measured in the CVE between 773 to 923 K. These results were compared to values calculated from spectral emittance curves measured in a room temperature Hohlraum reflectometer and in an open-air elevated temperature emissometer. The results differed by as much as 0.2 for some materials but were in closer agreement for the more highly-emitting, diffuse-reflecting samples. The differences were attributed to temperature, atmospheric, and directional effects, and errors in the Hohlraum and emissometer measurements ({+-} 5 percent). The probable error of the CVE measurements was typically less than 1 percent.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
- Sponsoring Organization:
- National Aeronautics and Space Administration, Washington, DC (United States); USDOE, Washington, DC (United States)
- DOE Contract Number:
- AI03-86SF16310
- OSTI ID:
- 10180587
- Report Number(s):
- NASA-TM--102322; CONF-890468--15; ON: DE94051204
- Country of Publication:
- United States
- Language:
- English
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