An empirical comparison of primary baffle and vanes for optical astronomical telescope

Taoran Li; Yingwei Chen

doi:10.1117/12.2272770

5 September 2017 An empirical comparison of primary baffle and vanes for optical astronomical telescope

Taoran Li, Yingwei Chen

Proceedings Volume 10401, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems; 104011E (2017) https://doi.org/10.1117/12.2272770
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

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.

Citation Download Citation

Taoran Li and 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); https://doi.org/10.1117/12.2272770

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KEYWORDS

Stray light

Astronomical telescopes

Astronomical imaging

Stars

Mirrors

Astronomy

Charge-coupled devices

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