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Proceedings Paper

NPS sparse aperture testbed
Author(s): Brij N. Agrawal; Jae Jun Kim; Jeffrey Baker; Ty Martinez; Bautista Fernandez
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Paper Abstract

This paper presents NPS Sparse Aperture Testbed development to demonstrate sparse aperture concept. The testbed has a sparse aperture array consisting of three 2-inch diameter F/20 spherical mirrors. Each mirror is connected to a separate 6 axis ThorLabs stage to simulate motion in satellite formation. The beam combining platform employs three 1-inch diameter flat mirrors mounted on the correcting PI tip/tilt/piston actuated stages to provide coherent beam combining capabilities. For metrology, the system uses Zygo 9 single-axis displacement measuring interferometers. Transformation matrix between the aperture motion measured by the metrology and required motion by the correcting piston and tip/tilt stages was determined. The mirrors were moved continuously representing satellite formation errors and the motion was measured by laser metrology and using transformation matrix, the correcting stages were commanded, resulting in coherent combination of images from three apertures.

Paper Details

Date Published: 9 September 2019
PDF: 9 pages
Proc. SPIE 11115, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts IX, 111150F (9 September 2019);
Show Author Affiliations
Brij N. Agrawal, Naval Postgraduate School (United States)
Jae Jun Kim, Naval Postgraduate School (United States)
Jeffrey Baker, Baker Adaptive Optics (United States)
Ty Martinez, Naval Research Lab. (United States)
Bautista Fernandez, Naval Postgraduate School (United States)


Published in SPIE Proceedings Vol. 11115:
UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts IX
Allison A. Barto; James B. Breckinridge; H. Philip Stahl, Editor(s)

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