Tip-tilt and chopping mechanism for the Subaru Telescope IR secondary mirror unit

Noboru Itoh; Yasushi Horiuti; Kouki Asari; Masahiko Hayashi

doi:10.1117/12.319310

25 August 1998 Tip-tilt and chopping mechanism for the Subaru Telescope IR secondary mirror unit

Noboru Itoh, Yasushi Horiuti, Kouki Asari, Masahiko Hayashi

Proceedings Volume 3352, Advanced Technology Optical/IR Telescopes VI; (1998) https://doi.org/10.1117/12.319310
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

The Subaru Telescope introduces a tip-tilt and chopping mechanism for an IR secondary mirror, which is of ULE light weight type, 1.3 m in diameter and 180 kg in weight. Performance targets of the tip-tilt and chopping mechanism are 30 Hz control band width with 0.01' resolution for tip- tilt and 30' amplitude with frequency of 5 Hz for chopping. To archive these targets, a system combining 6-point dynamic drive mechanism and 15-point passive support mechanism against for gravity are developed and compact actuators of electric magnet type for the drive mechanism are employed. Test with a dummy mirror shows that the performance target are achieved. This paper describes the design and test results of the tip-tilt and chopping mechanism.

Citation Download Citation

Noboru Itoh, Yasushi Horiuti, Kouki Asari, and Masahiko Hayashi "Tip-tilt and chopping mechanism for the Subaru Telescope IR secondary mirror unit", Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); https://doi.org/10.1117/12.319310

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