Abstract
Stars in the image field are rotating around image center when alt-az telescope tracks celestial targets,which increases difficulty to real time target identification and image processing based on multi-frame images.The K mirror with large aperture is designed to compensate image rotation for the Coude optical path of alt-az telescope in the paper.K mirror is composed of three reflecting mirrors,and its aperture is 42 mm.The angle between reflecting mirror 1 and reflecting mirror 3 is 120 degrees,and K mirror can be used in all spectral ranges.If incoming vector rotates a certain angle,and K mirror rotates half the angle that incoming vector rotated,then output vector does not rotate any angle.The reflecting mirror 1 and reflecting mirror 3 are made of plane mirrors and fixed on a metal triangle,substituting reflector which is made of triangular prism.Every reflecting mirror is assembled by using photoelectric auto-collimator and fine rotating platform,so it can be sure that the light axis of K mirror and the rotating axis of K mirror are in one line.The K mirror is directly drived by DC toque motor for the reason of fast response speed,and Renishaw angle encoder which angle resolution can be reach 0.072 arcsec by interpolation is adopted.
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