基于液晶波片的双折射滤光器的机械结构设计

Mechanical Structure Design of Hα Birefingent Filter Based on Liquid Crystal Variable Retarder

传统Lyot型地基Hα双折射滤光器通过机械旋转1/2波片调节滤光器的透过波长,达到滤光的目的。在利用液晶波片的延迟相位随驱动电压变化的特性下,替换旋转1/2波片,改进滤光器机械结构,减小滤光器的空间体积,增加滤光器的空间可靠性,为空间使用做好地基基础测试。综合考虑晶体安装,配合,结构的密封设计,温控系统,滤光器的空间尺寸与固定等因素,利用Solid Works软件进行机械结构设计及优化。液晶波片的双折射滤光器的体积与传统1/2旋转波片的双折射滤光器相比,晶体室从多级组合式改为两个半圆柱组合式结构,减少了旋转玻片及旋转电机的使用,简化了机械结构,减小附加震动,减轻了载荷重量,降低能耗。设计结果达到仪器的小型化和轻型化。

Replacing traditional 1 /2 rotary waveplate in the birefingent filter,liquid crystal variable retarders（ LCVRs） have been used to tune the Loyt stages to Hα wavelength by changing the voltage. The LCVRs birefingent filter would be smaller,lighter and better used in space observation. The main work is mechanical structure design of Hα birefingent filter based on the new optical system of LCVRs,by considering installation of the crystals,coordination,sealing the structure,temperature control of the systems,spatial dimensions and other factors. For mechanical designing Solid Works software has been used. Compared with the conventional half-wave plate rotating birefringent filter,without using the rotary wave plate and the motor,the mechanical structure is simplified,and that reduces the additional vibrations,the weight,and required energy. The main purpose of designing this filter is to achieve a miniaturized size and a light weighted filter housing.