双折射滤光器的误差分析与性能优化  

Error analysis and performance optimization of birefringent filter

作　　者：玄伟佳[1,2] 王东光[1] 邓元勇[1] 苏江涛[1] 张志勇[1] 孙英姿[1] 

机构地区：[1]中国科学院国家天文台怀柔太阳观测站,北京100012 [2]中国科学院研究生院,北京100049

出　　处：《光学精密工程》2010年第1期52-59,共8页Optics and Precision Engineering

基　　金：天文联合基金资助项目(No.10778723;No.10878016);国家自然科学基金(青年基金)资助项目(No.10803012)

摘　　要：由于双折射滤光器型太阳磁场望远镜中滤光器的研制质量直接影响透过带,进而影响太阳磁场的测量,本文对影响双折射滤光器透过带漂移的各种误差因素进行了分析。通过计算机编程,完全模拟了光线轨迹,精确分析了多种误差项对双折射滤光器透过带的影响。给出了引起透过带漂移、展宽、极大值和极小值变化的主要误差项。分析表明,入射角、晶体光轴倾角误差、晶体厚度误差和1/4波片光轴方位角误差影响透过带漂移;只有晶体光轴方位角误差影响透过带宽,当误差为2°时,透过带展宽了0.078%;宽视场1/2波片光轴方位角误差对极大值的影响最明显,当误差为2°时,极大值减小了0.487%;晶体光轴方位角误差、宽视场1/2波片延迟误差和1/4波片光轴方位角误差对极小值都有不同程度的影响。As the quality of filter in a solar magnetic field telescope with a birefringent filter directly affects the transmission band and the measurement of solar magnetic field,this paper researches the error factors that causes the shift of transmission band.By using computer program,the ray trace is simulated completely,and the variation of transmission band with different errors is obtained accurately.Analysis results provide the primary error terms that cause the band shift,band broadening,and the changes of maximum and minimum.Among these errors,the incident angle,optical axis tilt error of crystal,thickness error of crystal,and the optical axis azimuth error of quarter-wave plate affect the band shift.Moreover,the optical axis azimuth error of crystal affects the band broadening,and the transmission band will be broadened by 0.078% when the error is 2°.The optical axis azimuth error of a half-wave plate in a the wide field effects evidently on the maximum,and the maximum decrease by 0.487% when the error is 2°.Furthermore,the optical axis azimuth error of crystal,retardance error of half-wave plate in the wide field,and the optical axis azimuth error of quarter-wave plate have different effects on the minimum.

关 键 词：太阳观测 双折射滤光器 误差分析 光线追迹方法 

分 类 号：P111.41[天文地球—天文学] TH703[机械工程—仪器科学与技术]