【摘要】 文章基于阴极半导体电子发射理论和微通道板(MCP)电子倍增基本物理过程,分析阴极背景噪声和信噪比与阴极电压的关系,分析指出:像增强器背景噪声会随着阴极电压的增大而增长;像增强器系统噪声因子随着阴极电压的增大而减小,并趋于饱和。通过实验证明:增大阴极电压的幅度,像增强器背景噪声随之呈指数增长;输出信噪比随之呈单调增长,并趋于饱和。由此得出阴极最佳工作电压在-160V左右。更多还原

【Abstract】 Based on the electro emission theory of cathode semiconductor and the basic physical process of electron multiplication of MCP(micro-channel plate),this paper analyzes the relationship between cathode background noise and SNR and cathode voltage.The analyzed results point out: a.The background noise of a image intensifier will increases with the increase of photocathode voltage;b.The noise factor of an image intensifier will decrease with the increase of photocathode voltage,and tend to saturation.It is proved experimentally that with the increase of the photocathode voltage,the background noise increases in an exponential law;and the SNR increases monotonously and tends to saturation.As a result,the optimal photocathode voltage is about-160V.更多还原