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Rare Earth Doped Yttrium Aluminium Garnet (YAG) Selective Emitters

Published online by Cambridge University Press:  10 February 2011

Donald L. Chubb
Affiliation:
National Aeronautics and Space Administration, Lewis Research Center, 21000 Brook Park Rd, Cleveland, Ohio 44135, donald.chubb@lerc.nasa.gov
AnnaMaria T. Pal
Affiliation:
Essential Research, Inc., 23811 Chagrin Blvd., Cleveland, Ohio 44122
Martin O. Patton
Affiliation:
Essential Research, Inc., 23811 Chagrin Blvd., Cleveland, Ohio 44122
Phillip P. Jenkins
Affiliation:
Essential Research, Inc., 23811 Chagrin Blvd., Cleveland, Ohio 44122
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Abstract

As a result of their electron structure, rare earth ions in crystals at high temperature emit radiation in several narrow bands rather than in a continuous blackbody manner. This study presents a spectral emittance model for films and cylinders of rare earth doped yttrium aluminum garnets. Good agreement between experimental and theoretical film spectral emittances was found for erbium and holmium aluminum garnets. Spectral emittances of films are sensitive to temperature differences across the film. For operating conditions of interest, the film emitter experiences a linear temperature variation whereas the cylinder emitter has a more advantageous uniform temperature. Emitter efficiency is also a sensitive function of temperature. For holminum aluminum garnet film the efficiency is 0.35 at 1446K but only 0.27 at 1270 K.

Type
Research Article
Copyright
Copyright © Materials Research Society 1999

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