Displacement sensors applied on active optics in an astronomical telescope

Yongjun Qi; Zhenchao Zhang

doi:10.1117/12.670921

6 July 2006 Displacement sensors applied on active optics in an astronomical telescope

Yongjun Qi, Zhenchao Zhang

Proceedings Volume 6275, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III; 62751X (2006) https://doi.org/10.1117/12.670921
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

Many types displacement sensors used in active optics in many astronomical telescopes over the world ware described and the measurement theory of different sensors were explained in this paper. Based on the displacement sensor's specification of LAMOST, a test bed to check it which used dual-frequency laser interferometer was established. Some main parameters affect on the measurement accuracy of the test bed such as temperature, vibration as well as some mechanism characteristics of fixing devices were analyzed in detail, and correspond solutions were adopted. According to theoretic analysis, rectification method was brought forward to compensate the errors of sensor cause by tip-tilt, thermal shift, non-linearity, and combined with the test results of some types sensors, their advantages and disadvantages was concluded. At last it forecasted the most appropriate displacement will be used in future active optics based on the discussion above and the developing trend of large telescope.

Citation Download Citation

Yongjun Qi and Zhenchao Zhang "Displacement sensors applied on active optics in an astronomical telescope", Proc. SPIE 6275, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, 62751X (6 July 2006); https://doi.org/10.1117/12.670921

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