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

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

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3352..850i&link_type=abstract

Proc. SPIE Vol. 3352, p. 850-857, Advanced Technology Optical/IR Telescopes VI, Larry M. Stepp; Ed.

Computer Science

Performance

1

Scientific paper

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.

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