Keck interferometer beamline characterizations

Details Keck interferometer beamline characterizations Keck interferometer beamline characterizations

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spie.6268e.122h&link_type=abstract

Advances in Stellar Interferometry. Edited by Monnier, John D.; Schöller, Markus; Danchi, William C.. Proceedings of the SPIE,

Computer Science

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Scientific paper

The Keck interferometer has its V2 science mode open to its astronomical community and the Nuller science mode is maturing in its development. In order to push on and improve the limits of the instrument a program of analyzing the characteristics of its beamlines has begun. The purpose of this endeavor is to understand beamtrain characteristics for assessing and improving overall system performance. In this paper we present some of the initial results from measurements as well as preliminary analyses of polarization and wavefront quality. Polarization measurements were made on the internal beamtrains for two orthogonal telescope azimuth positions. The wavefront test is a static beamline measurement using a Shack-Hartmann sensor to sample the wavefront quality of the beamtrain. Also results from a dynamic beamtrain monitoring scheme is presented that involves measurements from the angle tracking system during on-sky operation.

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