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High temperature reflectance of hyperpure slip cast silicaAn experimental program to optically characterize hyperpure slip cast silica at elevated temperatures is described. This sintered ceramic material is being used in the development of a reflective heat shield for the Outer Planet Entry Probe. A unique high temperature integrating sphere reflectometer is described and reflectance data in the spectral range 0.23-2.3 micron are presented at temperatures up to 1427 C in air and helium environments. Kubelka-Munk (K-M) scattering and absorptance coefficients (K and S), using the Reichman extension of the K-M theory, are presented as is a unique method of obtaining K and S from the Reichman equations using only reflectance data. The hyperpure slip cast silica material was found to retain its high diffuse reflectance at temperatures up to 1204 C, with slight degradation occurring at higher temperatures.
Document ID
19760054720
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Dillow, C. F.
(McDonnell-Douglas Corp. Saint Louis, MO, United States)
Schmitt, R. J.
(McDonnell-Douglas Corp. Saint Louis, MO, United States)
Blome, J. C.
(McDonnell Douglas Corp. St. Louis, Mo., United States)
Date Acquired
August 8, 2013
Publication Date
July 1, 1976
Subject Category
Nonmetallic Materials
Report/Patent Number
AIAA PAPER 76-441
Meeting Information
Meeting: Thermophysics Conference
Location: San Diego, CA
Start Date: July 14, 1976
End Date: July 16, 1976
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
76A37686
Funding Number(s)
CONTRACT_GRANT: NAS2-7897
Distribution Limits
Public
Copyright
Other

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