第18卷
第3期
2010年3月
文章编号1004-924X(2010)03-0513-08
光学精密工程
Optics and Precision Engineering
兴隆1m光学望远镜消杂散光系统
赵飞1,2,王森1，邓超1.2，陈志远
Vol.18No.3 Mar.2010
（1.中国科学院国家天文台，北京100012;2.中国科学院研究生院，北京100049）
摘要：为优化兴隆1m光学望远镜的杂散光效应，研制了附加在该望远镜F/8焦面后的“一倍放大率消杂散光镜头”，对消杂散光镜头的效果进行了仿真计算和观测验证。在Tracepro软件中对“圆顶-1m望远镜”和”圆顶-1m望远镜-消杂散光镜头"组合系统的“点源辐照度透过率(PSNIT)”进行了计算分析并在大月夜进行了天文观测。计算结果表明，在视场外无限远点源方位与望远镜指向间夹角5≤19≤30"使用消杂散光镜头后，该望远镜PSNIT全部降低到10-1"以下。 2008年5月26日对偏月22"和25°天区观测结果表明，使用消杂散光镜头后，该望远镜所观测的星像信噪比约为原来的 1.4倍。仿真计算和观测结果表明：该方法对Ritchey-Chretien（R-C)望远镜的杂散光抑制是有效的，可以提高望远镜的测光精度和观测极限星等。
关键调：光学望远镜；杂散光；点源辐熙度透过率；信嗪比
中图分类号：TH743;P111.2
文献标识码：A
Straylight controllensforXingLong1-meteropticaltelescope
ZHAO Fei-, WANG Sen',DENG Chaol-,CHEN Zhi-yuan
(1.NationalAstronomicalObseruatories,ChineseAcademyofSciences,Beijing10o012,China;
2.GraduateUniversity of ChineseAcademy of Sciences,Beijing100049,China)
Abstract: To reduce the stray light effect of Xing Long l-meter optical telescope, an objective lens was developed,and simulations and observations were undertaken to evaluate the lens, The Point Source Normalized Irradiance Transmission(PSNIT)for"dome-telescope"and"dome-telescope-lens” systems was calculated with the code Tracepro and observations were carried out at a moon night. The calcula-tion results indicate that for the stray light sources located at off-axis angle within 3o°, the PSNITs of the observational system, including dome,1 m telescope and the lens, have been lower than 1o-10, Furthermore,the observation results for stars located at 22°and 25°off-axis angles away from the moon in May 26th 2008 indicate that the observational SNR of the system has been increased by a factor a bout 1. 4 with the lens. These results show that for the 1-meter optical telescope the stray light is re duced and the photometric accuracy and limiting magnitude are improved by the lens effectively
Key words: optical telescope; stray light; Point Source Normalized Irradiance Transmission(PSNIT)
Signal to Noise Ratio(SNR)
收稿日期：2009-05-26；修订日期：2009-07-28
基金项目：国家自然科学基金资助项目（No.10778624）