Optical design for the Global Astrometric Interferometer for Astrophysics

Sacha Loiseau; Stuart B. Shaklan

doi:10.1117/12.210930

2 June 1995 Optical design for the Global Astrometric Interferometer for Astrophysics

Sacha Loiseau, Stuart B. Shaklan

Proceedings Volume 2478, Space Telescopes and Instruments; (1995) https://doi.org/10.1117/12.210930
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

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.

Citation Download Citation

Sacha Loiseau and Stuart B. Shaklan "Optical design for the Global Astrometric Interferometer for Astrophysics", Proc. SPIE 2478, Space Telescopes and Instruments, (2 June 1995); https://doi.org/10.1117/12.210930

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