| With the development of modern astronomy and the need of research,people have higher requirements for the resolution of astronomical telescopes,and increasing the resolution means increasing the aperture of the telescope.The increase of the aperture of optical telescope brings many problems,especially the mirror seeing caused by mirror turbulence,which will not only affect the imaging,such as flicker and speckle,but also bring adverse effects in the optical processing and inspection process of mirror.Therefore,the role of mirror seeing detection is becoming more and more obvious.In this paper,a mirror seeing detection system based on wavefront slope is designed,which can reconstruct the turbulence near the mirror and obtain the mirror seeing by detecting wavefront slope.Based on the influence of turbulence on beam transmission,the system designs a scheme,establishes a brightness detection model,and introduces related detection algorithms,including image preprocessing,centroid detection and characterization algorithm of mirror brightness.Then,according to this paper,the detection scheme of mirror seeing is designed,the components of the detection system are introduced,and the designed scheme is verified by optical simulation and numerical simulation.Finally,a mirror seeing detection system based on wavefront slope is built,and the experimental seeing detection results are analyzed,and the seeing evaluation of a certain area in a certain period of time is given.Finally,the whole detection system is summarized and the improvement scheme is put forward.Generally speaking,this paper studies a method to measure the seeing of large aperture mirror based on wavefront slope,completes the detection of turbulence in a certain range,and obtains the mirror seeing in this range. |
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