Studies on small circular membrane mirrors with electrostatic actuation and closed loop control

Umesh A. Korde; Miles A. Wickersham; Joseph J. Farke; Mark E. Hofacker

doi:10.1117/12.711200

27 April 2007 Studies on small circular membrane mirrors with electrostatic actuation and closed loop control

Umesh A. Korde, Miles A. Wickersham, Joseph J. Farke, Mark E. Hofacker

Proceedings Volume 6525, Active and Passive Smart Structures and Integrated Systems 2007; 652520 (2007) https://doi.org/10.1117/12.711200
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2007, San Diego, California, United States

Abstract

This paper discusses small deformable mirrors based on thin metallized membranes and designed for steering and focusing of beams as well as providing correction for a small number of optical aberration modes. We consider circular membranes driven electrostatically by four electrodes deposited on or milled into a light weight substrate. The metallized surface on the membrane, while acting as a mirror also provides the ground electrode to enable actuation. Here we discuss prototype testing of the mirrors based on different production techniques, and report on closed loop control studies using two formulations: (1) an approximate lumped-parameter model based on a single-input-single-output linearized treatment, and (2) a linearized, continuous parameter model leading to a multiple-input-multiple-output state space system via modal expansion. A quadrant photo-detector ("quad cell") is used as an output sensor.

Citation Download Citation

Umesh A. Korde, Miles A. Wickersham, Joseph J. Farke, and Mark E. Hofacker "Studies on small circular membrane mirrors with electrostatic actuation and closed loop control", Proc. SPIE 6525, Active and Passive Smart Structures and Integrated Systems 2007, 652520 (27 April 2007); https://doi.org/10.1117/12.711200

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