5 September 2017 An empirical comparison of primary baffle and vanes for optical astronomical telescope
Author Affiliations +
Abstract
In optical astronomical telescopes, the primary baffle is a tube-like structure centering in the hole of the primary mirror and the vanes usually locate inside the baffle, improving the suppression of stray light. They are the most common methods of stray light control. To characterize the performance of primary baffle and vanes, an empirical comparison based on astronomical observations has been made with Xinglong 50cm telescope. Considering the convenience of switching, an independent vanes structure is designed, which can also improve the process of the primary mirror cooling and the air circulation. The comparison of two cases: (1) primary baffle plus vanes and (2) vanes alone involves in-dome and on-sky observations. Both the single star and the various off-axis angles of the stray light source observations are presented. The photometrical images are recorded by CCD to analyze the magnitude and the photometric error. The stray light uniformity of the image background derives from the reduction image which utilizes the MATLAB software to remove the stars. The in-dome experiments results reveal the effectiveness of primary baffle and the independent vanes structure. Meanwhile, the on-sky photometric data indicate there are little differences between them. The stray light uniformity has no difference when the angle between the star and the moon is greater than 20 degrees.
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Taoran Li, Taoran Li, Yingwei Chen, Yingwei Chen, } "An empirical comparison of primary baffle and vanes for optical astronomical telescope", Proc. SPIE 10401, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems, 104011E (5 September 2017); doi: 10.1117/12.2272770; https://doi.org/10.1117/12.2272770
PROCEEDINGS
11 PAGES


SHARE
RELATED CONTENT

Status of the first Antarctic survey telescopes for Dome A
Proceedings of SPIE (September 17 2012)
Subaru telescope: "open use"
Proceedings of SPIE (January 02 2002)

Back to Top