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Optical Engineering

Development of a lightweight active optic system for a spaceborne relay mirror application
Author(s): Mark S. Janosky
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Paper Abstract

The design and performance of an active optic figure control system for a spaceborne relay mirror application is described. Development centered on minimizing overall system weight while meeting a prescribed set of figure control requirements. The optic, an Ultra Low Expansion ULE, lightweight, 17 in. hexagonal mirror, uses a combination of moment and force actuators to control the optical figure. Modeling of the mirror to determine the placement of the actuators that minimizes the rms aberrations at low spatial frequencies is discussed. It is shown that the actuator configuration chosen is capable of significantly correcting all primary Zernike terms up to trefoil (i.e., focus, tilt, power, coma, astigmatism, and trefoil) with the exception of spherical. Preliminary "manual" closed loop operation of the system has demonstrated that the static optical figure of 2.5 waves peak-to-valley and 0.4 wave rms can be corrected to 0.5 wave peak-to-valley and 0.1 wave rms.

Paper Details

Date Published: 1 November 1990
PDF: 5 pages
Opt. Eng. 29(11) doi: 10.1117/12.55734
Published in: Optical Engineering Volume 29, Issue 11
Show Author Affiliations
Mark S. Janosky, Eastman Kodak Co. (United States)

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