象增强器中光电子向光子的转换过程,常常伴有会导致信噪比降低、使象增强器在低照度下性能变坏的过程。例如,离子反馈和放大系数值分散就是这样的过程。由于存在这些过程,象增强器荧光屏上就会出现不同亮度的闪烁并损耗部分光电子。因此实际使用的象增强器,其信噪比都比理论值低。这种情况用噪声因子来表征,噪声因子也就 Image intensifier optoelectronic photon conversion process, often accompanied by will lead to lower signal to noise ratio, the image intensifier in low light performance deterioration process. For example, ion feedback and amplification factor value is such a process. Due to the existence of these processes, the intensifier screen will appear different brightness of the flicker and loss of some photoelectrons. Therefore, the actual use of image intensifier, the signal to noise ratio than the theoretical value is low. This situation is characterized by the noise factor, the noise factor is also