First fringe measurements with a phase-tracking stellar interferometer

Details First fringe measurements with a phase-tracking stellar interferometer First fringe measurements with a phase-tracking stellar interferometer

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apopt..19.1519s&link_type=abstract

Applied Optics, vol. 19, May 1, 1980, p. 1519-1522. Research supported by the MIT Sloan Fund for Basic Research

Physics

Optics

27

Atmospheric Effects, Infrared Interferometers, Instrument Errors, Star Trackers, Telescopes, Algorithms, Angular Resolution, Diffraction Patterns, High Resolution, Prototypes

Scientific paper

A prototype two-telescope stellar interferometer with a 1.5-m base line has been used to track the white-light fringes, 0.4-0.9 micron, from Polaris. Continuous fringe phase and amplitude measurements were made with an approximately 220-photon/4-msec integration time and a 1.27 sq cm collecting area under 2-arc sec seeing conditions. The same control algorithm should be able to track fringes from an 8.7-mg star using the light from two 13-cm telescopes and a 10-msec integration time under 1-arc sec seeing conditions. When tracking, the servo maintained equal path lengths to 0.1-micron rms in the two arms of the interferometer, thus cancelling the path-length variations caused by earth rotation and atmospheric turbulence.

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