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欲使电子显微镜获得高分辨本领的象,条件之一是必须具有高度稳定的电源.理论分析指出:电子加速电压U及物镜励磁电流I的任一变动都将引起象差,其模糊圆半径为下式确定:
One of the conditions for obtaining the high-resolution image of an electron microscope is that it must have a highly stable power supply.The theoretical analysis shows that any variation of the electron accelerating voltage U and the field excitation current I will cause aberration with a fuzzy circle radius of The following formula: