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Title: Development of closed loop adaptive optics system at laboratory
Authors: Narsireddy, Anugu
Issue Date: Jul-2011
Publisher: Indian Institute of Astrophysics
Citation: M. Tech. Thesis, University of Calcutta, Calcutta
Abstract: Atmospheric turbulence reduces the quality of the image from the optical telescope. The plane wavefront becomes distorted because of turbulence. Adaptive Optics is a technique that corrects the distorted wavefront to obtain the diffraction limited performance of the ground-based telescope. An Adaptive Optics system mainly consists of three main components, a wavefront sensor, a wavefront corrector and a control system. The project work is carried out in three parts. In order to understand the design parameters of Adaptive optics, in the first part of the project work, effort has been put to study the atmospheric turbulence numerically and experimentally. A turbulence simulator is designed at optics laboratory and characterized. Numerical studies of the Kolmogorov turbulence is simulated with MatLab routines at different D/ro ratio by considering different turbulent layer heights. Both simulation results are presented. The Shack-Hartmann Wavefront Sensor (SHWFS) is used for wavefront sensing. A detailed study of SHWFS in the presence of various noise and atmospheric turbulence has been reported. The turbulence simulator simulated in the laboratory is introduced in a closed Adaptive Optics system (AO Kit) and the turbulence characteristics are estimated.
Description: Restricted Access
Thesis Supervisor Dr. J. P Lancelot
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Appears in Collections:Integrated M.Tech-Ph.D (Tech.)

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