Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..628..250s&link_type=abstract
IN: Advanced technology optical telescopes III; Proceedings of the Meeting, Tucson, AZ, Mar. 3-6, 1986 (A87-35201 15-89). Bellin
Astronomy and Astrophysics
Astronomy
3
Astrometry, Kalman Filters, Michelson Interferometers, Pointing Control Systems, Reflecting Telescopes, Star Trackers, Delay Lines, Gimbals, Laser Interferometry, Optical Equipment, Servocontrol
Scientific paper
The Mark III stellar interferometer is a phase coherent long baseline telescope Michelson stellar interferometer that has been under construction since 1984. The instrument is designed primarily for accurate wide angle astrometry at the milliarcsecond level. It will use two color measurements to reduce the error due to atmospheric turbulence and a 20-meter baseline, 2.5 milliarcsecond resolution, that is laser monitored to achieve high precision. Initial operation of the Mark III is scheduled for late 1986. An optical delay line is used to equalize the path lengths in the interferometer. The delay line is programable in 50 Å steps with 100 Å accuracy over a peak to peak range of 20 meters (1 part in 109) with maximum slew rate of 60 cm/sec. The authors are planning to build additions to the instrument for optical aperture synthesis.
Colavita Mark M.
Shao Maxine
Staelin David H.
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