| 摘要 |
PCT No. PCT/GB83/00174 Sec. 371 Date Mar. 6, 1984 Sec. 102(e) Date Mar. 6, 1984 PCT Filed Jul. 15, 1983 PCT Pub. No. WO84/00443 PCT Pub. Date Feb. 2, 1984.Electron beam apparatus includes a voltage measuring electron collector including solid electrodes with central apertures. The electrodes comprise a corrector electrode (63) maintained at zero volts, an extractor electrode (15) at about 5 kilovolts positive, a filter electrode (16) which has an internally tapered tubular central part (67), a mirror electrode (64) and a scintillator (17) in the annular space between the mirror electrode and the filter electrode.
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