| 单词 | gas focusing |
| 释义 | > as lemmasgas focusing gas focusing n. Electronics (now chiefly historical) (in a cathode ray tube) focusing of an electron beam by means of positive ions produced in a residual gas. ΚΠ 1931 Jrnl. Franklin Inst. 212 717 In this method there is less disturbance from gas focusing and space charge if the filament current is made as low as will give a still visible spot with the magnetic focusing. 1960 New Scientist 9 June 1475/1 The only cathode ray tube in practical use was a small soft vacuum affair which relied upon gas-focusing and which could not be modulated without loss of focus. 2009 F. Nebeker Dawn of Electronic Age vii. 285 This tube relied on electric fields to obtain a tightly focussed electron beam; until then electromagnetic focusing and gas focusing..had seemed more promising. < as lemmas |
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