Theoretical Research And Simulation As Intensifier

With the emergence of night vision devices, human vision no longer stays in the day, but into the dark. As the main component of night vision device, low-light level image intensifier has a direct impact on development of night vision devices. The research of image intensifier is related to the electron optics, electromagnetic theory, the cathode electronics, material science and many other disciplines. The process is very complex. The advantages of image intensifier include light weight, small size, low dark noise and good for hiding; However, the image intensifier is expensive and this hinders its research and development. Using the computer technology, the hardware experiments can be reduced and the performance of image intensifier can be improved. Also, the time of research can be saved.The work of low-light level image intensifier usually consists of three parts: photoelectric conversion of photocathode, electrons from photocathode focus in the focusing system and electrons increase energy in the microchannle plate. In this paper, the relevant theory and simulation around the key components of low-light level image intensifier are studied and the main works are listed as follows:1. Summary systematically the domestic and foreign research actuality and up-to-date of low-light level image intensifier; Introduce the basic theory, working principle and component of low-light level image intensifier; Theoretically, the movement process of the optoelectronics under the photocathode, the microchannel plate and the anode are analyzed respectively. Finally, we completely analyze the work process of the third generation image intensifiers. In the theoretical analysis of microchannel plate, a new microchannel plate gain model is deduced. The new gain model shows good agreement with the experimental results. And then based on the theoretical basis of negative electron affinity (GaAs) photocathode, the quantum efficiency is derived and calculated and the effect of the rate of back-interface recombination on quantum efficiency are calculated and analyzed.2. The particle simulation code of CST and the electron optics simulator of MTSS are used to simulate the focusing system of low-light level image intensifier. The results from these two code are compared and analyzed.3、By changing the model of low-light level image intensifier, the streak camera is modeled in CST and MTSS, and the particle trajectories are obtained and analyzed. The results of simulation show that:the trajectories of the electrons are deflection in the streak cam...