Active optics - From the test set up to the NTT in the observatory

Details Active optics - From the test set up to the NTT in the observatory Active optics - From the test set up to the NTT in the observatory

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1114..314n&link_type=abstract

IN: Active telescope systems; Proceedings of the Meeting, Orlando, FL, Mar. 28-31, 1989 (A90-30852 12-74). Bellingham, WA, Socie

Physics

Optics

1

Active Control, Astronomical Observatories, Optical Correction Procedure, Reflecting Telescopes, Actuators, Mirrors, Position Errors, Zenith

Scientific paper

The ESO's New Technology Telescope (NTT) active primary mirror optics control system underwent proof-of-concept testing in the form of a 1-m diameter, 19-mm thick mirror with a support geometry identical to that of the NTT. The 78 actuators, of which 75 were astatic levers with movable counterweights, were located on four rings with three fixed points on the third ring. The full-scale 3-m primary mirror was then tested in zenith position with both a phase-shifting interferometer and a Shack-Hartmann analyzer; it was found that the aberration of rotational symmetry zero can be characterized as either a combination of third- and fifth-order spherical aberration or as a pure first elastic mode.

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