第18卷第1期 2010年1月
文章编号
1004924X(2010)01-0052-08
光学精密工程
Optics and Precision Engineering
双折射滤光器的误差分析与性能优化
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.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）
Vol.18No.1
Jan.2010
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，人射角、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喇透过带漂移，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。关键
词：太阳观测；双新勃滤光器；误差分析；光线追述方法
中图分类号：P111.41;TH703
文献标识码：A
Erroranalysisand performanceoptimization of birefringentfilter
XUAN Wei-jial-2,WANGDong-guang',DENGYuan-yong'
SU Jiang-tao',ZHANG Zhi-yong', SUN Ying-zi
(1.HuairouSolarObservingStation,NationalAstronomical Observatories
ChineseAcademy of Sciences,Beijing100012,China;
2.GraduateUniversity of ChineseAcademy of Sciences,Beijing100049,China)
Abstract: As the quality of filter in a solar magnetic field telescope with a birefringent filter directly af fects the transmission band and the measurement of solar magnetic field,this paper researches the er-ror 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 accurate ly. 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. o78% 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
收稿日期：2009-04-08；修订日期：2009-05-13.
基金项目：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）资助项日（No.
10803012)