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Narrow zone heating by a new radiation focusing technique - Toroidal ellipsoid furnaceThe paper describes the design of a toroidal ellipsoid furnace for narrow zone heating of materials in sealed transparent ampoules. The heater is a toroid flattened to an elliptical cross section like a partially inflated inner tube resting on a horizontal surface. The foci of the ellipsoid are two concentric rings. The outer focus is occupied by a heater wire, and the inner focus is arranged to fall on the surface of the cylindrical ingot within its transparent capsule. One advantage of the new furnace is that the wire heater closely approximates the ideal shape, lying along an extended line focus, as opposed to the elusive point source of the Costello furnace. Also, the ingot is heated uniformly around its circumference.
Document ID
19780061554
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Davidson, M. C.
(NASA Marshall Space Flight Center Huntsville, Ala., United States)
Holland, L. R.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 9, 2013
Publication Date
August 1, 1978
Publication Information
Publication: Review of Scientific Instruments
Volume: 49
Subject Category
Instrumentation And Photography
Accession Number
78A45463
Distribution Limits
Public
Copyright
Other

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