Active compensation of flexure on the High-Resolution Optical Spectrograph for Gemini

Details Active compensation of flexure on the High-Resolution Optical Spectrograph for Gemini Active compensation of flexure on the High-Resolution Optical Spectrograph for Gemini

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.2871.1306d&link_type=abstract

Proc. SPIE Vol. 2871, p. 1306-1317, Optical Telescopes of Today and Tomorrow, Arne L. Ardeberg; Ed.

Physics

Optics

Scientific paper

Gravity-induced flexure has been a long-standing challenge in Cassegrain spectrographs at 4-meter class telescopes; it is the more so at the scale of 8-meter telescopes. This is of particular concern for the Gemini high resolution optical spectrograph, which will be Cassegrain-mounted for its routine mode of operation. In this paper we address the general flexure problem, and how to solve it with the use of active optics. We also present the results of an experimental active flexure compensation system for the ISIS (intermediate- dispersion spectroscopic and imaging system) spectrograph on the 4.2 m William Herschel Telescope (WHT). This instrument, called ISAAC (ISIS spectrograph automatic active collimator), is based on the concept of active correction, where spectrum drifts, due to the spectrograph flexing under the effect of gravity, are compensated by the movement of an active optical element (in this case a fine steering tip-tilt collimator mirror). The experiment showed that active compensation can reduce flexure down to less than 3 micrometer over four hours of telescope motions, dramatically improving the spectrograph performance. The results of the experiment are used to discuss a flexure compensation system for the high resolution optical spectrograph (HROS) for the 8 m Gemini telescope.

Affiliated with

Also associated with

No associations

Rating

Active compensation of flexure on the High-Resolution Optical Spectrograph for Gemini does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Active compensation of flexure on the High-Resolution Optical Spectrograph for Gemini, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active compensation of flexure on the High-Resolution Optical Spectrograph for Gemini will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1542266