The Computer Simulation Of The Adaptive Optics System

As the capacity of the astronomical observation increases, the demand of high-quality observation instruments is growing. The ground-based telescope as the workhorse for the observations plays a more and more important role, but the near-ground atmosphere limits the observation ability severely. I studied the atmospheric dispersion corrector and adaptive optics system in this thesis. Most of my research about the adaptive optics system is directed by professor Sijiong Zhang. Professor Dingqiang Su directs me in the study of the wavefront sensing and the system design of the adaptive optics. He also discusses the relations between the adaptive optics, the active optics and the opti-mization of the optical system with me. These discussions deepen my understanding of these subjects.The atmospheric dispersion corrector is used to correct the dispersion brought by the atmosphere. For the ordinary telescope, the atmospheric dispersion corrector is made of a pair of lens-prisms. The lens-prism will rotate to generate different dispersion to compensate the atmospheric dispersion. But this classical design is not suitable for the LAMOST which has a big focal plane.We designed a segmented atmospheric dispersion corrector. The segmented atmospheric dispersion corrector will correct the dispersion of3.35arcsec with0.4arcsec residual aberration.The adaptive optics system uses a wavefront sensor to test the wavefront error and a deformable mirror to compensate the error simultaneously. This system includes three parts:the wavefront sensor, the deformable mirror and the control computer. Because each part is complicated and the system performance has complex relation with each part, the simulation is necessary to evaluate the system’s performance. We analyzed the operating principle of the whole system and set the numerical model of it including:the atmospheric turbulence, the deformable mirror, the Shack-Hartmann wavefront sensor and the control computer. We simulate the classical adaptive optics system for the2.16m telescope and the ground layer adaptive optics system for the Antarctic KDUST with Monte Carlo model. From the results of these simulations, we have the detailed pa-rameters of these systems and the performance of them.