Two-telescope interferometric testbed to develop low-cost atmospheric correction techniques for high angular resolution

Lyle G. Finkner; Isabelle Percheron; Jeffrey T. Baker; Darryl J. Sanchez

doi:10.1117/12.317157

24 July 1998 Two-telescope interferometric testbed to develop low-cost atmospheric correction techniques for high angular resolution

Lyle G. Finkner, Isabelle Percheron, Jeffrey T. Baker, Darryl J. Sanchez

Author Affiliations +

Proceedings Volume 3350, Astronomical Interferometry; (1998) https://doi.org/10.1117/12.317157
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

A two multi-r_o telescope interferometer was built at Air Force Research Lab in Albuquerque New Mexico as a development testbed. The principal objective of this testbed is to develop existing techniques and to test novel low-cost technologies for applications in future interferometers. These technologies include a tip/tilt piston mirror that has a 500-Hz bandwidth with a 200-wave adjustable piston capability at 633nm. This type of mirror has been installed on both telescopes and is used to track objects and scan for fringes. The data obtained on these objects will be used to determine algorithms for measuring fringe visibility at low light level. Additional technologies include liquid crystal devices that have been used to correct static aberrations in the optical system and will be used with a new wavefront sensing technique to correct low order atmospheric aberrations. The new wavefront sensor currently being developed in-house uses a GEN III intensifier optically coupled to a Dalsa camera to provide atmospheric correction on faint extended objects. The testbed will also be utilized to test single mode fiber optics as a replacement to traditional recombining optics. This will potentially reduce the cost and simplify the alignment of multi telescope interferometers.

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Lyle G. Finkner, Isabelle Percheron, Jeffrey T. Baker, and Darryl J. Sanchez "Two-telescope interferometric testbed to develop low-cost atmospheric correction techniques for high angular resolution", Proc. SPIE 3350, Astronomical Interferometry, (24 July 1998); https://doi.org/10.1117/12.317157

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