| 释义 |
guard ring
guard ring n 1. (Jewellery) jewellery Also called: guard or keeper ring an extra ring worn to prevent another from slipping off the finger 2. (General Physics) an electrode used to counteract distortion of the electric fields at the edges of other electrodes in a capacitor or electron lens guard ring
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. MedicalSeeguard |