中国科学院云南天文台机构知识库

对拼接主镜进行主动控制是拼接镜技术的难点之一,8m环形拼接太阳望远镜主动光学的控制性能主要取决于倾斜探测的精度与控制模型建立的准确程度。在研制主动控制系统时,需要对倾斜探测精度定标以及建立较为准确的控制模型,即对主动控制系统定标。实验系统中搭建了用于实时探测拼接子镜倾斜的Shack-Hartmann波前传感器,并对其重复测量精度进行了定标,精度达到0.014arcsec,接近8m RST面形控制要求。然后利用边缘传感器和Shack-Hartmann波前传感器测量了两镜主动控制系统的控制矩阵,建立较为准确的控制模型。 

Active control of the segmented primary mirror is one of the key technologies. The control performance of the active optics of the 8m ring solar telescope mainly depends on the accuracy of the tip/tilt detection and the accuracy of the control model. When developing an active control system, it is necessary to calibrate the tip/tilt detection accuracy and establish a more accurate control model, that is, to calibrate the active control system.A Shack-Hartmann wavefront sensor for detection of the tip/tilt of the segmented mirrors is built in the experimental system, and the repeating measurement accuracy is scaled to an accuracy of 0.014 arcsec, which is close to the 8mRST shape control requirement. Then the edge sensor and Shack-Hartmann wavefront sensor are used to measure the control matrix of the two-segment mirror active control system, and a more accurate control model is established.