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A New Approach for Changing Structural Properties of a Membrane Mirror Strip for Adaptive Optics Applications

[+] Author Affiliations
Jamil M. Renno, Pablo A. Tarazaga, Benjamin L. Grisso, Daniel J. Inman

Virginia Polytechnic Institute and State University, Blacksburg, VA

Paper No. DETC2007-34091, pp. 1809-1816; 8 pages
doi:10.1115/DETC2007-34091
From:
  • ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1: 21st Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C
  • Las Vegas, Nevada, USA, September 4–7, 2007
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 0-7918-4802-7 | eISBN: 0-7918-3806-4
  • Copyright © 2007 by ASME

abstract

This work investigates improving the imaging quality of membrane mirrors using multiple active fiber composite (AFC) actuators. It is demonstrated in the literature that the structural characteristics of a circular membrane lens can be used advantageously to eliminate nearly 100% of a 5th order image aberration. The approach here is to study the transverse vibration of a membrane mirror strip augmented with two micro fiber composite (MFC) bimorphs. Each bimorph is placed near one of the ends of the strip. One of the bimorphs will be excited in phase, causing a local tension in the strip, whereas the other will be excited out of phase, causing a local bending moment. The finite element method (FEM) is used to present the system mathematically. The advantage of the FEM is evident; it easily handles the physical non-uniformities caused by the augmentation of the actuators. To verify the presented model, a constant in-phase voltage is supplied to one of the MFCs. Hence, the local tension induced by this MFC bimorph is constant, and the resulting model is linear. A frequency response is obtained from the FEM model and through an experiment. The FEM and experimental results are in agreement. Additionally, results show that the local tension changes the structural properties of the membrane strip. The proposed approach can be extended to the two dimensional case with the promise of contributing to the elimination of image aberrations.

Copyright © 2007 by ASME

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