摘要
为实现夜间可靠跟踪恒星并测量整层大气透过率,采用直驱力矩电机和圆光栅绝对编码器作为伺服部件,研制一套二维直驱跟星转台。该转台具有定位精度高、环境适应性好及野外长期运行免维护的优点,能够实现夜间长期跟踪目标恒星并自动换星功能。结合搭载其上的由望远镜、CCD相机和滤轮等组成的图像采集系统,搭建了测量实验平台。搭建的测量实验平台采用主-从式控制方式,上位工控机对图像采集系统进行相应控制,同时向下位机反馈转台方位偏差;下位机跟星转台控制系统采用装载Linux系统的ARM7数字处理器为控制核心,并内置自研的星图。通过上、下位机协同软件开发实现整层大气透过率测量的完整功能。开展了转台功能验证实验,整层大气透过率测量和激光雷达的对比实验。结果表明,二维直驱跟星转台能够实现夜晚长期跟踪目标恒星并自动换星测量,转台搭载的望远镜系统根据恒星的图像数据能够可靠地反演出夜间整层大气透过率,满足测量实验的功能要求。
To reliably track stars and measure the transmittance of the whole-layer atmosphere at night,a two-dimensional direct-drive star-following turntable was developed using a direct-drive torque motor and a circular grating absolute encoder as servo parts.These parts offer the advantages for the turntable of high positioning accuracy,good environmental adaptability,and long-term field operation without maintenance.The turntable can realize the functions of the long-term tracking of target stars at night and automatic star change.Combined with the image acquisition system mounted on the turntable,which comprises a telescope,CCD camera,and filter wheel,the measurement experimental platform is built.The measurement experimental platform adopts the master-slave control mode.The upper computer controls the image acquisition system and provides the azimuth deviation feedback of the turntable to the lower computer.The control system of the tracking star turntable of the lower computer adopts the ARM7 digital processor loaded with the Linux system as the control core and a built-in self-developed star map.It realizes the complete function of the transmittance measurement of the whole-layer atmosphere by the collaboration of the upper and lower computer software developments.The turntable function verification experiment,the transmissivity measurement experiment of the whole-layer atmosphere,and contrast experiment using radar were conducted.Results show that the two-dimensional direct-drive star-following turntable can track the target star for a long time and automatically change the star for measurements at night.Moreover,the telescope system mounted on the turntable can reliably reverse the transmittance of the whole-layer atmosphere at night based on the image data of stars,meeting the functional requirements of measurement tests.
作者
朱翠汝
孙凤萤
徐文清
程久明
詹杰
Zhu Cuiru;Sun Fengying;Xu Wenqing;Cheng Jiuming;Zhan Jie(Key Laboratory of Atmospheric Optics,Anhui Inustitute of Optics and Fine Mechanics,Hefei Inustitutes of Physical Science,Chinese Acdemy of Sciences,Hefei,Anhui 230031,China;Science Island Branch,G roaduate School of University of Science and Technology of China,Hefei,Anhui 230026,China;Anhui Laboratory of Ad vanced Laser Technology,Hefei,Anhui 230037,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2021年第16期9-16,共8页
Acta Optica Sinica
基金
中国科学院科技创新重点实验室基金(CXJJ-19S028)。
关键词
大气光学
力矩电机
直驱
跟星
二维转台
大气透过率
atmospheric optics
torque motor
direct drive
track star
two-dimensional turntable
atmospheric transmissivity
