Alignment of LBT optics using a laser tracker

Details Alignment of LBT optics using a laser tracker Alignment of LBT optics using a laser tracker

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010spie.7733e.177r&link_type=abstract

Ground-based and Airborne Telescopes III. Edited by Stepp, Larry M.; Gilmozzi, Roberto; Hall, Helen J. Proceedings of the SPIE,

Physics

Optics

Scientific paper

The laser tracker allows the precise determination of positions of surfaces in three dimensions over volumes exceeding 30 m radius from the tracker head. At the Large Binocular Telescope a laser tracker has recently been employed for the initial alignment of all telescope optics in the right hand side (DX) bent Gregorian optical train. In this paper the particular approach to alignment of optical elements employed during this campaign is discussed in detail, together with results and expected accuracies. Subsequent to this "mechanical alignment" the telescope was taken "onsky" and a subsequent "optical alignment" using a Shack-Hartman wavefront sensor with stellar sources took place. Ongoing activities include using the laser tracker to measure elevation and thermally induced displacements of individual optical elements.

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