Accession Number : ADA499243


Title :   Misregistration in Adaptive Optics Systems


Descriptive Note : Master?s Thesis


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


Personal Author(s) : Engstrom, Nathan


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a499243.pdf


Report Date : Mar 2009


Pagination or Media Count : 79


Abstract : An adaptive optics (AO) system is most effective when there is a known alignment between the wave front sensor (WFS)and the deformable mirror (DM). Misregistration is the term for the unknown alignment between the WFS and DM. Misregistration degrades system performance and can make the system unstable. An AO system uses a reconstruction matrix to transform WFS measurements into DM commands. A standard AO system uses a model reconstruction matrix that assumes perfect registration between the WFS and DM. The object of this research is to mitigate the negative effects of misregistration by using offline WFS measurements to create the reconstruction matrix. To build the reconstruction matrix, each actuator on the DM is poked to a fixed amount, and then the resulting measurement on the WFS is recorded. Analytic studies of the model and measured matrices show that the measured matrix yields a more stable AO system. Additional simulations indicate that applying the measured matrix improves the overall system performance compared to that of the model reconstruction matrix.


Descriptors :   *ADAPTIVE OPTICS , *DEFORMABLE MIRRORS , WAVEFRONTS , THESES , DETECTORS , MATHEMATICAL ANALYSIS


Subject Categories : Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE