Low-light-level image intensifier images weak optical signal through electron multiplication process in
Low-light-level night vision device, the key technology of intensifier is electron multiplier, the thesis put forward three
kinds of electron multiplication methods. One is that the electron multiplier device is the avalanche transistor made use
of the semiconductor material, the thesis analyses the photoelectric conversion theory and rapid multiplication avalanche
breakdown conditions with PN junction of the avalanche diode under reverse bias by light excitation; the second
approach is to use gas discharge theory to explains the electron multiplication process in the low-pressure gas and
high-pressure gas discharging breakdown by photon excitation; the third method is photoelectron multiplication gain
theory,in the microchannel plate (MCP) as the second generation image intensifier in vacuum condition and the applied
voltage. The thesis analyses that the electronic gain efficiency is better than the other two methods ,and proposes the
avalanche transistor can be key device of image intensifier.
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