摘要
基于脉冲展宽分幅技术,设计研制了一种短磁聚焦变像管。采用磁标位分析法求解磁场分布,通过对电子轨迹追迹的方法并结合Matlab编程对像管的静态空间分辨率进行了模拟计算。在阴栅电势差为3 k V,成像倍率为1∶1,成像激励为450安匝的条件下,得出在阴极中心、离轴5 mm和离轴10 mm处的空间分辨率分别为17,8.6和5.3 lp/mm。考查了阴栅电势差和磁透镜空气隙缝宽度等因素对空间分辨率的影响,并借助像差理论予以解释。该程序模型占用内存小、执行速度快,可为变像管的设计和分析提供更为便捷的途径。
Based on pulse-dilation framing technique, an image converter using short magnetic focusing is designed and developed. Magnetic scalar potential analysis is adopted to solve the distribution of magnetic field. Static spatial resolution of the image converter is numerically simulated by virtue of electron trajectory tracking method combining with matlab programming. It is reported that under the excitation condition of 450 ampere- turns, the electric potential difference between the cathode and the mesh anode is 3.0 kV and imaging magnification is 1 ： 1, the calculated spatial resolutions of the centre, 5 mm and 10 mm off-axis points are 17, 8.6 and 5.3 lp/mm, respectively. The effects of the electric potential difference and the slot width of the magnetic lens on the spatial resolution are discussed, which can be explained by the aberration theory. The programm model occupies less memory and runs fast, which provides a more convenient way to design and analyze image converters.
出处
《激光与光电子学进展》
CSCD
北大核心
2016年第1期202-206,共5页
Laser & Optoelectronics Progress
基金
国家自然科学基金(11305107)
关键词
测量
光电子学
分幅变像管
MATLAB模拟
静态空间分辨率
磁聚焦系统
电子轨迹
measurement
optoelectronics
framing image converter
matlab simulation
static spatial resolution
magnetic focusing system
electron trajectory
