guard ring

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guard ring

[′gärd ‚riŋ]
(electricity)
A ring-shaped auxiliary electrode surrounding one of the plates of a parallel-plate capacitor to reduce edge effects.
(electronics)
A ring-shaped auxiliary electrode used in an electron tube or other device to modify the electric field or reduce insulator leakage; in a counter tube or ionization chamber a guard ring may also serve to define the sensitive volume.
(thermodynamics)
A device used in heat flow experiments to ensure an even distribution of heat, consisting of a ring that surrounds the specimen and is made of a similar material.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In this respect, for example, the effects of a guard ring electrode on the operation of a capacitive transducer have been investigated [8].
It is a very emotional moment when the honor guard rings that silver fire bell for Code 5-5-5: Return to Station, and the station for the deceased fireman is beyond the grave.
On the custom of "keeper" or guard rings, see Anne Randall White, Twentieth Century Etiquette, n.p., 1904, 90.