4 November 1982 Performance Of The Multiple Mirror Telescope (MMT) VI. MMT Telescope Coalignment System
Author Affiliations +
A crucial feature of large telescopes using multiple objectives is the ability to align the optics so that the different star images coincide to within a fraction of the image size. Initially this was intended to be done in the MMT with the "laser active optics" system in which the six telescopes were coaligned by means of artificial laser-star images generated by a seventh guide-alignment telescope. That system was found to be less than satisfactory mostly because of internal seeing and scattered light effects. Instead we have constructed the Telescope Coalignment System (or TCS) in which the telescopes are co-aligned on stellar images. The TCS is an autoguider which works simultaneously on six telescopes and which therefore automatically coaligns the telescopes and tracks them on a field star. When a field star is not present in the small 4 arc minute field of view of the MMT the TCS system coaligns the MMT on a nearby star and then tracks and maintains co-alignment of the six telescopes under computer control using separate flexure corrections for each one.
© (1982) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jacques M. Beckers, Chad Poland, Bobby L. Ulich, J. R. P. Angel, Frank J. Low, William Wyatt, "Performance Of The Multiple Mirror Telescope (MMT) VI. MMT Telescope Coalignment System", Proc. SPIE 0332, Advanced Technology Optical Telescopes I, (4 November 1982); doi: 10.1117/12.933502; https://doi.org/10.1117/12.933502


A laser guide star system for LAMOST
Proceedings of SPIE (July 22 2014)
The 3,6 m Indo Belgian Devasthal Optical Telescope general...
Proceedings of SPIE (September 17 2012)
Acquisition, Image Stacking, And Autoguiding With The MMT
Proceedings of SPIE (August 20 1986)
The Magellan Telescopes
Proceedings of SPIE (February 04 2003)
APE the Active Phasing Experiment to test new control...
Proceedings of SPIE (August 18 2005)
The GRAVITY acquisition and guiding system
Proceedings of SPIE (July 21 2010)
Field stabilization on the ESO VLT telescopes
Proceedings of SPIE (June 16 2000)

Back to Top