Research On Electrode Performance Of Small Pore Microchannel Plate

Small pore MicroChannel Plate (SP-MCP) means its channel pore is less than or equal to 6μm, channel length(i. e thickness of MCP) is less than or equal to 0. 32mm. Its performance of electrode will directly exert the influence on gain and spatial resolution of MCP, accordingly, affect luminance gain and modulation transfer function(MTF) of low level image intensifier which contains this MCP, and in some extent impact on image intensifier's signal to noise ratio and its quality of field of view. Strengthening research on the electrode performance of small pore MCP, thinking seriously about the tactical and technological index of high performance electrode, instructing technics , looking forward to improving signal to noise ratio, luminance gain, and spatial resolution of our country's low level light image intensifiers, and then upgrading total technical level of our country's low level light image intensifiers.Adopting method of combining theory and experiment, giving a pro-fund analysis of high performance low level light image intensifier's general operational requirements and special requirements for input electrode and output electrode, focusing on research : different parameter, for example, material , vacuum coating technology and film thickness of input electrode will exert the influence on reflectivity in different wave length; electrode surface resistance affects gain uniformity and electrode penetrating input channel depth impact on gain of MCP; It is improve gain of MCP and reduce its noise factor to coat high secondary electron emission material film in input channel of MCP; effects of electrode structure on output electron energy distribution and gain of MCP; special requirements for input and output electrode are submitted when MCP is used to detect ultrafast signal .Research results show that: the better it is , the lower MCP input electrode surface resistance is , but its thickness must be proper, it will benefit to detect ultrao fast signal, improve gain uniformity in inverted imager, and has no impact on other performance; the better it is , the shallower MCP input electrode penetrates channel depth, this will benefit to improve gain of MCP, if coating high secondary electron emission material film in input channel of MCP, not only improve gain of MCP, but also reduce its noise factor; the reflectivity of input surface of MCP affects photon noise of image intensifier with the kind of MCP, especially when it is working in high level light. MCP's output electrode penetrating channel depth will affect its gain and output electron energy and angle distribution, accordingly, impact on spatial resolution of image intensifier , these impacts always sacrifice some technical parameters to insure other parameters. Sometimes we must compromise mutual contradiction parameters. New technical route allow us to improve mutual contradiction parameters as well. Finally , we research modulation transfer function(MTF)of image intensifier with MCP.