摘要
为实现红外双波段共孔径光学系统,设计出一种采用大孔径、无焦反射式光学系统,并详细介绍该系统结构.中波和长波MTF值在25线对下均大于0.3.考虑到该光学系统野外使用时复杂的运输环境,利用有限元法对简化后的卡塞格林式望远系统进行低阶振动特性和模态特性分析.通过比较2种材料的模态分析计算结果,最终选取铝合金为金属材料,保证1阶固有频率大于50 Hz,满足野外运输条件,说明该系统结构合理可行.
To achieve an infrared optical systems with dual band common aperture, a reflective afocal optical system with large aperture is designed and the system structure is described in detail. MTF values of Mid-wave and long-wave are bigger than 0.3 under 25 line pairs. Considering the complex transportation environment of the optical system in the field, the characteristics of lower order vibration and mode of the simplified Cassegrain telescope system are analyzed using finite element analysis. By comparing the modal analysis results of two materials, aluminum alloy is eventually selected as metal material, and the first order natural frequency is greater than 50 Hz. The result meets the field transportation conditions. The system structure is rational and feasible.
出处
《计算机辅助工程》
2013年第A01期270-273,共4页
Computer Aided Engineering
基金
吉林省自然科学基金(201215131)
