Structure and mechanical design for a large-aperture telescope

Yufeng Tan; Jihong Wang; Ge Ren; Xiaoli Ren; Zongliang Xie; Dong Li

doi:10.1117/12.2314933

20 February 2018 Structure and mechanical design for a large-aperture telescope

Yufeng Tan, Jihong Wang, Ge Ren, Xiaoli Ren, Zongliang Xie, Dong Li

Proceedings Volume 10697, Fourth Seminar on Novel Optoelectronic Detection Technology and Application; 1069734 (2018) https://doi.org/10.1117/12.2314933
Event: Fourth Seminar on Novel Optoelectronic Detection Technology and Application, 2017, Nanjing, China

Abstract

For a better understanding and forecasting of the universe, the high resolution observations are needed. The largeaperture telescope is an integrated success with a combination of material, mechanics, optics and electronics. The telescope is a classic Cassegrain configuration with open structure, alt-azimuth mount, and retractable dome. The instrumentation has a rotating mass of approximately 52 tons and stands over 9 m tall. The 3-m aperture primary mirror is a honeycomb lightweighted mirror with fused silica material and active cooling. The paper will address preliminary design and development of the telescope mount structure, axes drive system, encoder mount and primary mirror system. The structure must have the best performance of stiffness and stability to demand an acceptable image quality. As the largest optical element of the telescope, primary mirror must be well controlled and protected both during operational and non-operational periods. An active cooling system of primary mirror is provided by a flushing subsystem at the front side and sucking subsystem on the central hole to keep the temperature of the facesheet close to that of ambient air. A two-layer mirror cover mounted on the elevation ring is proposed to protect the optical elements and inner beam tube from dust, dirt and debris. Furthermore, the latest plans for future upgrades will be also described.

Citation Download Citation

Yufeng Tan, Jihong Wang, Ge Ren, Xiaoli Ren, Zongliang Xie, and Dong Li "Structure and mechanical design for a large-aperture telescope", Proc. SPIE 10697, Fourth Seminar on Novel Optoelectronic Detection Technology and Application, 1069734 (20 February 2018); https://doi.org/10.1117/12.2314933

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KEYWORDS

Mirrors

Telescopes

Optical instrument design

Space telescopes

Active optics

Actuators

Control systems

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