Effect of ion barrier film on the noise characteristics of proximity focusing low-light-level image intensifier

摘要

To analyze the effect of ion barrier film in micro-channel plate on the performance of proximity focusing low-light-level image intensifier, the noise characteristics of ion barrier film are studied. The transmission electrons' distribution for those have transmitted ion barrier films is determined by simulating the collision interaction between the incident electrons and ion barrier film with Monte Carlo method. Furthermore, the relationship model of the incident electrons and transmission electrons are established by time differential method. We simulate how the incident electron energy and ion barrier film thickness affect the noise factor of ion barrier film. The simulation analysis results reveal that the noise factors gradually decreased with the increase of incident electron energy (0.1 KeV - 2.0 KeV) and decreasing of film thickness (1 to 8 nm). So the tendency of simulation results is accordant with the actual devices. The smaller noise factor means the better image quality for low-light-level image device, and the simulation results suggest how to realize the ion barrier film in low light level image intensifier with low noise factor. Therefore, the study of ion barrier film's noise characteristics provides theoretical and technical support for optimization of the three generations low-light-level device's performance.