Physics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3430..282s&link_type=abstract
Proc. SPIE Vol. 3430, p. 282-292, Novel Optical Systems and Large-Aperture Imaging, Kevin D. Bell; Michael K. Powers; Jose M. Sa
Physics
Scientific paper
A detailed simulation of a white light interferometer system for measuring nanometer scale structural motion is presented. Two operational methods are studied: low bandwidth, low resolution centroid tracking of the structure motion, and fine resolution, high bandwidth fringe tracking. A Michelson interferometer is modeled with one optical path containing a target mirror attached to the structure, and the second path containing a voice coil actuated reference mirror for path length difference control. Simulation results reveal a 3 nanometer RMS error for a 1 micron, 100 Hz structure motion during fringe tracking. This system is being developed at the Air Force Research Laboratory, Space Vehicles Directorate, under the UltraLITE program as part of an imaging spacecraft brassboard demonstration that requires 12 nanometer RMS absolute piston control.
Robertson Lawrence
Schrader Karl N.
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