红外光纤传像系统像质优化方法研究

红外光纤传像系统在红外探测领域具有重要的学术价值和广阔的应用前景。文中采用理论分析与实验验证相结合的方法，对其像质优化问题进行研究。基于系统工作原理和特点，建立了其调制传递函数的理论模型，分析了影响其像质的主要因素。结果表明:为保证系统成像质量，前置物镜及后继耦接镜在系统Nyquist频率处的MTF值应大于0.8，且耦接镜所成光纤像与探测器像元的对准偏差应小于0.5像元。为进一步分析光纤传像束自身缺陷对像质影响，特搭建了成像实验装置，对两种不同规格光纤传像束推扫成像结果对比发现:通过使用合适后继耦接镜、多层光纤TDI模式成像、传像束前后端镀增透膜、准确的均匀性校正处理等方法，可有效改善系统的成像质量。以上研究为该类系统的研制提供了必要的技术储备。

Research on the methods of image quality optimization in infrared system with imaging fiber bundle

Infrared (IR) system with imaging fiber bundle has important academic value and broad application prospects in the field of IR detection. The method of combining numerical simulation and experimental analysis was adopted to study the problem of image quality optimization of this system. Based on the system working principle and characteristics, a mathematic model of its modulation transfer function (MTF) had been established. The main influence factors of the image quality had been analysed. The numberical simulation analysis results showed that to ensure its image quality, the MTF of fore objective lens and relay lens should be larger than 0.8 at the system Nyquist frequency, the misadjustment between fiber images and pixels should be less than 0.5 pixel size. To analyze the influence of the imaging fiber bundle defects, system principle-demonstrating experiment had been accomplished. After comparing the push-broom image results with two different formats fiber bundle, a set of technical methods to improve the system image quality had been deduced. Such as, using appropriate relay lens, time delay integral (TDI) mode push-broom with several tiers fibers, coating on the entrance and exit bundle ends, exact uniformity correction processing, et al. All the results above provide necessary technical reserves for the development of such novel system.