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.
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The proposed capacitive probe shown in Fig.2 consists of a three-part coaxial capacitive sensor in which the middle one is acting as the main sensing probe and the other two capacitors considered as the guard rings in order to reduce the stray capacitance effect and the source of errors in measurements (it must be mentioned that such design is more useful for the case of small capacitance change measurements).
TEMPERATURE EFFECT ON CAPACITANCE MEASUREMENTS OF THE DIFFERENT CHEMICAL LIQUIDS USING A CYLINDRICAL CAPACITIVE SENSOR
Both packages use the guard ring effect so the Si photodiodes can accurately measure low-level signals.
Low noise Si photodiodes for UV to NIR precision photometry. (Semiconductors)
The rotor chamber incorporates a steel guard ring to ensure the safe use and containment of all rotors.
Tabletop Centrifuge: speeds up to 21,000 rpm
Most sensor suppliers use a guard ring principle, although some suppliers offer a guard ring principle combined with a special triaxial cable (double guarding).
Factors to consider... When selecting a non-contact capacitive displacement sensor, a number of key factors need to be considered, including target size and shape, guarding method and bandwidth. As well as clean environments, the sensors can also operate in dirty, dusty industrial areas too, says Chris Jones of Micro-Epsilon

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