反射器(摄影)
射电望远镜
望远镜
执行机构
流离失所(心理学)
物理
职位(财务)
计算机科学
光学
主镜像
遥感
声学
作者
Yong Zhang,Guoping Li,Guohua Zhou,Qishuai Lu,Heng Zuo,Yan Wang,Hui Zhang,Aihua Li,Chao Zhang,Ye-Ping Li,Xuhao Wu,Hao Li,Tian Z. Hu,BinBin Xiang,Na Wang
出处
期刊:Publications of the Astronomical Society of the Pacific
[IOP Publishing]
日期:2022-01-01
卷期号:134 (1031): 015003-015003
标识
DOI:10.1088/1538-3873/ac32af
摘要
Abstract The surface accuracy of a large radio telescope’s primary reflector is easily affected by gravity and temperature change during observations. An active surface system is crucial to ensure the regular operation and high-quality data output of the radio telescope. We propose a real-time closed-loop active surface system including two components. The first component, a new type of photoelectric edge sensor, detects the angle change of the adjacent panels. The second component, the displacement actuator, adjusts the panels’ position and posture to compensate for the angle changes. So, over the entire observation, the closed-loop surface control system with these two components could actively maintain the primary reflector’s accuracy in real time. Using this approach, we constructed an experimental active surface system for the Xinjiang Qitai 110 m Radio Telescope (QTT) to test the maintenance of the surface accuracy. The angle measurement accuracy is better than 0.″2, and the positioning accuracy of the displacement actuator could achieve ±15 μ m over the whole 50 mm stroke. The preliminary test results show that the accuracy requirements of the QTT’s primary reflector surface can be met using the active surface system we propose.
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