Optics: measuring and testing – Lens or reflective image former testing – Focal length measuring
Reexamination Certificate
2006-05-23
2006-05-23
Lee, Hwa (Andrew) (Department: 2877)
Optics: measuring and testing
Lens or reflective image former testing
Focal length measuring
C359S848000, C359S849000
Reexamination Certificate
active
07050161
ABSTRACT:
An apparatus controls positions of plural mirror segments in a segmented mirror with an edge sensor system and a controller. Current mirror segment edge sensor measurements and edge sensor reference measurements are compared with calculated edge sensor bias measurements representing a global radius of curvature. Accumulated prior actuator commands output from an edge sensor control unit are combined with an estimator matrix to form the edge sensor bias measurements. An optimal control matrix unit then accumulates the plurality of edge sensor error signals calculated by the summation unit and outputs the corresponding plurality of actuator commands. The plural mirror actuators respond to the actuator commands by moving respective positions of the mirror segments. A predetermined number of boundary conditions, corresponding to a plurality of hexagonal mirror locations, are removed to afford mathematical matrix calculation.
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John Rakoczy et al., “Global Radius-of-Curvature Estimation and Control for the Hobby-Eberly Telescope,” Proceedings of the SPIE, 4837-79 ed., p. 681-692, (Aug. 22, 2002).
Lee Hwa (Andrew)
Marlette Todd E.
McGroary James J.
Punnoose Roy M.
The United States of America as represented by the Administratio
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