Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994exa.....4..297t&link_type=abstract
Experimental Astronomy (ISSN 0922-6435), vol. 4, no. 3-4, p. 297-315
Astronomy and Astrophysics
Astronomy
7
Atmospheric Effects, Atmospheric Turbulence, Michelson Interferometers, Optical Correction Procedure, Seeing (Astronomy), Servomechanisms, Turbulence Effects, Wave Front Deformation, Mirrors, Optical Control, Optical Equipment, Piezoelectric Transducers
Scientific paper
The tilt correction servo for the Sydney University Stellar Interferometer (SUSI) consists of a 'pyramid' detector and piezo-electrically controlled tilt mirrors. The system measures image position and re-centers it with a sample frequency of 1000 Hz thereby holding the two beams of the interferometer parallel with a standard deviation of 0.164 +/- 0.025 arcseconds. With an aperture size of 0.06 meters this implies less than a 2% loss in the visibility measurements made by SUSI. The servo has been used to magnitude 6.5 stars and is predicted to have a limiting magnitude of 7.5 and possibly as high as 8.5. The system not only corrects for the tilt introduced by the atmosphere but will supply a good estimate of seeing conditions using the same optical path through the atmosphere as the visibility measurements of the interferometer.
Tango William J.
ten Brummelaar Theo A.
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