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Proceedings Paper

Active figure maintenance control using an optical truss laser metrology system for a space-based far-IR segmented telescope
Author(s): Kenneth H. Lau; William G. Breckenridge; Noble M. Nerheim; David C. Redding
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Paper Abstract

A two-stage active control approach was developed addressing the figure control problem for a spaceborne FIR telescope, the Precision Segmented Reflectors Focus Moderate Mission Telescope (FMMT). The first active control stage aligns the optical segments based on images; attention is here given to the second stage, active figure maintenance control system, which maintains the alignment of the optical elements between initializations to hold the mirror figure steady while obtaining data and fixes translational and rotational changes of the optical segments induced by long-term thermal drifts of the support structure. Errors are expected to be 10-100 microns at the nodes of the primary backup structure over the course of an orbit. An rms performance of 0.8 microns of wavefront error can be expected during the maintenance function based on specified nominal sensor noises, actuator accuracies, and system environments. A performance of less than 0.3 microns rms can be expected, based on advanced components.

Paper Details

Date Published: 10 July 1992
PDF: 23 pages
Proc. SPIE 1696, Controls for Optical Systems, (10 July 1992); doi: 10.1117/12.138159
Show Author Affiliations
Kenneth H. Lau, Jet Propulsion Lab. (United States)
William G. Breckenridge, Jet Propulsion Lab. (United States)
Noble M. Nerheim, Jet Propulsion Lab. (United States)
David C. Redding, Charles Stark Draper Lab., Inc. (United States)

Published in SPIE Proceedings Vol. 1696:
Controls for Optical Systems
John A. Breakwell, Editor(s)

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