Accession Number:

ADA455202

Title:

Lightweight In-Plane Actuated Deformable Mirrors for Space Telescopes

Descriptive Note:

Doctoral thesis, Sep 2003-Sep 2006

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT

Personal Author(s):

Report Date:

2006-09-01

Pagination or Media Count:

239.0

Abstract:

This research focused on lightweight, in-plane actuated, deformable mirrors, with the ultimate goal of developing a 20- meter light gathering aperture for space telescopes. The 0.127 meter diameter deformable mirror small scale testbed was modelled in nite elements using MSC.Nastran software and then used as a basis for a quasi-static controller. Experi- mental tracking of Zernike tip, tilt, and defocus modes was accomplished. The analytical solutions to plate-membrane and beam-string ordinary dierential equations were developed. A simplied approach to modelling the axisymmetric cases was also presented. A novel static control strategy, the Modal Transformation Method, was developed to form Zernike surfaces within an interior, or clear aperture, region using a number of statically-actuated Bessel-based vibration modes. The scaling problem for membrane optics is addressed. Signicantly, it is shown linear modelling may correctly explain the behavior of small-scale models, but only non-linear models will account for the important terms which govern the full-scale large aperture membrane telescopes.

Subject Categories:

  • Optics
  • Unmanned Spacecraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE