Single-MCP Cs2Te solar blind ultraviolet image intensifier couldn’t detect weaker ultraviolet radiation, such as the
ultraviolet radiation near high-voltage wire insulating column. To increase the ultraviolet radiation gain, the double-MCP,
tri-MCP or multi-MCP units are introduced into ultraviolet image intensifiers. In this paper, two pieces of MCP are
cascaded in "V" shape as the electron multiplier of ultraviolet image intensifiers. Processed and scrubbed by the
single-MCP electron scrubbing traditional technology, the desired effect after electron scrubbing still could not be
achieved and flicker phenomenon appeared in field of view. The flicker noise appeared when the image intensifier was
working because the second MCP was not efficiently scrubbed. In order to completely scrub the two pieces of MCP
simultaneously, eliminate the flicker noise, reduce the dark current and achieve a stable MCP gain, the double-MCP
electron scrubbing method should be optimized without changing the assembly process. Combined with MCP
pre-treatment and pre-electron-scrubbing before assembled and scrubbed in “V” shape, flicker noise could be eliminated
effectively, and dark current could be lowered, which could increase the gain and get a clear field of view. Comparing
with two different methods of double-MCP electron scrubbing, either method has its own advantages and disadvantages.
Ultraviolet radiation gain can be increased from 103~104 cd·m-2/W·m-2 to 1.0×105 cd·m-2/W·m-2 by using method of pre-treatment and pre-electron-scrubbing. With prospective ultraviolet radiation gain achieved, double-MCP Cs2Te solar blind ultraviolet image intensifier is manufactured.