cavity radiator

cavity radiator

[′kav·əd·ē ′rād·ē‚ād·ər]
(thermodynamics)
A heated enclosure with a small opening which allows some radiation to escape or enter; the escaping radiation approximates that of a blackbody.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The third device, shown in Figure 1c, is used to spot coagulating sites on stumps and consists of a loop and cavity radiator.