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Active figure maintenance control using an optical truss laser metrology system for a space-based far-IR segmented telescopeA 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.
Document ID
19930050284
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lau, Kenneth
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Breckenridge, Bill
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Nerheim, Noble
(JPL Pasadeana, CA, United States)
Redding, David
(Charles Stark Draper Lab., Inc. Cambridge, MA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Controls for optical systems; Proceedings of the Meeting, Orlando, FL, Apr. 21, 22, 1992 (A93-34276 13-74)
Publisher: Society of Photo-Optical Instrumentation Engineers
Subject Category
Optics
Accession Number
93A34281
Distribution Limits
Public
Copyright
Other

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