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Proceedings Paper

Optical design for the Global Astrometric Interferometer for Astrophysics
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Paper Abstract

Space-based interferometers dedicated to wide-angle astrometry would dramatically increase the accuracy of angular measurements fundamental to a wide range of astrophysical problems. The proposed Global Astrometric Interferometer for Astrophysics, a continuously rotating instrument comprising two or three interferometers, will reach the 5-20 (mu) as level on more than 35 million objects. The necessary wide field-of-view for such a precision could be obtained with a Fizeau interferometer. We propose a design for a 2.6 m baseline interferometer with two 0.5 m apertures, and overal dimensions compatible wiht the size of the Ariane V payload shroud. It has approximately 1 degree diffraction limited field-of-view. The response of the optical system to small perturbations on each optical element is given in terms of fringe visibility, which is shown to depend only on subaperuture spot separation.

Paper Details

Date Published: 2 June 1995
PDF: 11 pages
Proc. SPIE 2478, Space Telescopes and Instruments, (2 June 1995); doi: 10.1117/12.210930
Show Author Affiliations
Sacha Loiseau, Ctr. National d'Etudes Spatiales (France)
Stuart B. Shaklan, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 2478:
Space Telescopes and Instruments
Pierre Y. Bely; James B. Breckinridge, Editor(s)

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