Wave-front sensing and correction for 4-meter LAMOST

Xi Zhang; Deqing Ren; Yongtian Zhu; Jiangpei Dou

doi:10.1117/12.825417

17 September 2009 Wave-front sensing and correction for 4-meter LAMOST

Xi Zhang, Deqing Ren, Yongtian Zhu, Jiangpei Dou

Proceedings Volume 7439, Astronomical and Space Optical Systems; 74390V (2009) https://doi.org/10.1117/12.825417
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

LAMOST is a 4m spectroscopic telescope recently operational at Xinglong, China. Several active optics are being used to remove optical aberration of the telescope, but large residual aberration exists since the active optics actuators on the telescope's segmented mirrors cannot provide enough precision. We proposed a wave-front sensing system and the corresponding algorithm to measure this low frequency residual aberration. We developed a compact Shack-Hartmann wave-front sensor that can use point source as well as extended structure images for wave-front sensing and can achieve good measurement accuracy. The wave-front sensing algorithm is realized by LabVIEW that is based on block-diagram programming and is suitable for rapid prototype development. Combined with deformable mirrors, the system will be able to provide a fine wave-front correction and therefore eventually remove the residual aberration for LAMOST. The wave-front sensor and the DMs will also be used for our high-contrast imaging coronagraph to remove speckle noise for the direct imaging of exoplanets.

Citation Download Citation

Xi Zhang, Deqing Ren, Yongtian Zhu, and Jiangpei Dou "Wave-front sensing and correction for 4-meter LAMOST", Proc. SPIE 7439, Astronomical and Space Optical Systems, 74390V (17 September 2009); https://doi.org/10.1117/12.825417

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KEYWORDS

Mirrors

Calibration

Telescopes

Sensing systems

Active optics

Sensors

Actuators

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