Show simple item record

dc.contributor.authorSchgallis, Richard J.
dc.date.accessioned2012-03-14T17:37:25Z
dc.date.available2012-03-14T17:37:25Z
dc.date.issued2007-12
dc.identifier.urihttp://hdl.handle.net/10945/3140
dc.description.abstractPhase Diversity Wavefront Sensing (PD WFS) is a wavefront reconstruction technique used in adaptive optics, which takes advantage of the curvature conjugating analog physical properties of a deformable mirror (MMDM or Bi-morph) such that the computational intensity required for correcting an aberrated wavefront, becomes simplified over traditional Shack-Hartmann WFS techniques. By looking at an image reflected off a deformable mirror by two cameras placed on either side of focus of a lens, intensity differences, indicating wavefront aberration in the beam, can be detected by the cameras acting together as a WFS and analyzed by a computer providing control to the actuators of a deformable mirror such that any detected difference in intensities between the two cameras can be minimized. This process of mirror surface conjugation serves to correct for the aberrated or curved wavefront by reflecting a new wavefront, compensated for curvature, such that its reflection is approximately planar. The theory of PD WFS is well documented however, there is very little quantifiable information regarding the specific challenges in designing a functioning PD WFS. In this research a PD WFS was designed and the concept proven such that a wavefront could be corrected through a computer controlled closed loop conjugation of a deformable mirror. The results were analyzed using a traditional Shack-Hartmann WFS and off-the-shelf "Front Surfer" wavefront analysis software to verify the validity of the experimental data. PD WFS has become critical in the development of segmented mirror adaptive optical systems where traditional wavefront reconstruction using Shack-Hartmann wavefront sensing tends to break down at the mirror segment edges. The Naval Postgraduate School, Spacecraft Research and Design Center (SRDC) intends to explore the use of a segmented mirror adaptive optical systems for space based applications.en_US
dc.description.urihttp://archive.org/details/phasediversitywa109453140
dc.format.extentxiv, 55 p. : ill.en_US
dc.publisherMonterey. California. Naval Postgraduate Schoolen_US
dc.subject.lcshOpticsen_US
dc.subject.lcshComputer programsen_US
dc.subject.lcshSpaceen_US
dc.subject.lcshTechnologyen_US
dc.titlePhase diversity wavefront sensing for control of space based adaptive optics systemsen_US
dc.typeThesisen_US
dc.contributor.secondreaderAgrawal, Brij
dc.contributor.secondreaderLarraza, Andres
dc.contributor.secondreaderKIm, Jae-Jun
dc.contributor.corporateNaval Postgraduate School
dc.description.serviceUS Navy (USN) author.en_US
dc.identifier.oclc191067939
etd.thesisdegree.nameM.S.en_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineApplied Physicsen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
etd.verifiednoen_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record