Method for operating an image intensifier tube by generating high frequency alternating electric field between cathode and channel plate thereof
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United States of America Patent
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Nov 17, 1992
Grant Date -
N/A
app pub date -
Dec 11, 1990
filing date -
Jul 1, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An image intensifier tube is provided with a channel plate. The channel plate's channels are open both at the cathode side and at the anode side. A high frequency alternating electric field is generated in the space between the cathode and the channel plate. Thereby during a first period of the cycles of the alternating electric field the photoelectrons emitted by the photocathode traverse the space between the photocathode and the channel plate. During a second period of the cycles of the alternating electric field, in which second periods the polarity of the electric field is reversed with respect to the polarity during the first period, any ions that may have emerged from the channels into the space between the photocathode and the channel plate are drawn back to the channel plate.
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