Tuning of the NTT alignment.

Details Tuning of the NTT alignment. Tuning of the NTT alignment.

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998msngr..92...15g&link_type=abstract

The Messenger, vol. 92, p. 15-18

Physics

Optics

1

Ntt: Alignment

Scientific paper

Since the end of the NTT upgrade project it has been known that the alignment of the secondary mirror (M2) was only marginally within specification. When the atmospheric seeing was greater than one arcsecond, the misalignment had no noticeable effect on the image quality. But, under better seeing conditions, it was a limiting factor for the image quality. Therefore, it was decided to tune the position of the M2 unit. The NTT wave front sensors are used, which are part of the Active Optics system, in a novel way to measure the required realignment of M2.

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