Active phase stabilization at the I2T: implementation of the ASSI table

Details Active phase stabilization at the I2T: implementation of the ASSI table Active phase stabilization at the I2T: implementation of the ASSI table

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2200..222r&link_type=abstract

Proc. SPIE Vol. 2200, p. 222-230, Amplitude and Intensity Spatial Interferometry II, James B. Breckinridge; Ed.

Computer Science

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We present the Active Stabilization in Stellar Interferometry (ASSI) beam combining optical table which was installed on the 2- telescope interferometer (I2T) of the Observatoire de la Cote d'Azur in 1993. To achieve very high angular resolution, the 26- centimeter telescopes can be positioned along a 140-meter North- South baseline. The limiting magnitude of the instrument depends dramatically on its ability to stabilize the fringe pattern despite the atmospheric disturbances. The function of the ASSI table is to perform this task. Three adaptive mirrors are used. The first two are fine pointing mirrors which correct the fluctuations of the angle of arrival of the two wavefronts. The other corrects the optical path difference fluctuations between the two telescopes. These corrections, e.g. tip-tilt and piston phase, are required to obtain high precision visibility measurements. We present our first observing results obtained on bright stars that have allowed the evaluation of the ASSI table performance in image tracking.

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