Low-cost space structure experiment optical phasing control system

Details Low-cost space structure experiment optical phasing control system Low-cost space structure experiment optical phasing control system

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995spie.2478..117d&link_type=abstract

Proc. SPIE Vol. 2478, p. 117-127, Space Telescopes and Instruments, Pierre Y. Bely; James B. Breckinridge; Eds.

Physics

Scientific paper

A description is presented of a sparse aperture telescope system designed to automatically control piston and tilt errors of the optical wavefront. The main thrust of this project is to design a satellite with a sparse aperture optical system payload. In order to reduce risk, this project also includes a laboratory demonstration of the ability to automatically phase the two segments of the sparse primary, common secondary optical telescope. By simulating the degradation of fringe visibility due to disturbances, an error budget has been created to determine the payload and laboratory experiment design requirements. With a fringe visibility system goal of 0.5, the error budget allocates 0.72 visibility to both subaperture phasing and common mode tilt. The purpose of the ongoing laboratory experiment is to validate the automatic phasing control system. A 1/4 scale design of the flight telescope and full scale equivalents of the phasing control system were built for the laboratory test. The tilt control loops have demonstrated the required 100 Hz bandwidth, and the ability of the piston algorithm to sense a change in optical path difference has also been demonstrated.

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