Closed Loop Adaptive Optics Control by Venema Todd (19 results)

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Paperback or Softback. Condition: New. Closed-Loop Adaptive Optics Control in Strong Atmospheric Turbulence. Book.

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Taschenbuch. Condition: Neu. Neuware - A self-referencing interferometer based closed-loop adaptive optics controller is developed which is designed to operate effectively under strong turbulence conditions. The aberrated optical field is modeled stochastically and then estimates of the state of the system are developed using a steady-state, fixed-gain Kalmanfilter. The phase of the optical field is considered the state of the system which is wrapped in a limited range of (-; ]. This phase is unwrapped through the use of a least-squares reconstructor which has been modified to work effectively in the presence of branch points associated with strong turbulence. The conjugate of the optical phase is then applied to the system's deformable mirror in order to correct for the e ects of atmospheric turbulence on the optical field. The advances developed in this research are in the application of a steady-state, fixed-gain Kalmanfilter to the input of an adaptive optic system, unwrapping the optical phases after the field estimation, and improving the phase unwrapping by varying the domain of the rotational phase component present in strong turbulence. The system developed in this research is shown in computer simulation to be improved over current designs by comparing performance plotsof system Strehl ratios for systems utilizing the different designs.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.…

Buch. Condition: Neu. Neuware - A self-referencing interferometer based closed-loop adaptive optics controller is developed which is designed to operate effectively under strong turbulence conditions. The aberrated optical field is modeled stochastically and then estimates of the state of the system are developed using a steady-state, fixed-gain Kalmanfilter. The phase of the optical field is considered the state of the system which is wrapped in a limited range of (-; ]. This phase is unwrapped through the use of a least-squares reconstructor which has been modified to work effectively in the presence of branch points associated with strong turbulence. The conjugate of the optical phase is then applied to the system's deformable mirror in order to correct for the e ects of atmospheric turbulence on the optical field. The advances developed in this research are in the application of a steady-state, fixed-gain Kalmanfilter to the input of an adaptive optic system, unwrapping the optical phases after the field estimation, and improving the phase unwrapping by varying the domain of the rotational phase component present in strong turbulence. The system developed in this research is shown in computer simulation to be improved over current designs by comparing performance plotsof system Strehl ratios for systems utilizing the different designs.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.…

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