射电望远镜主动反射面系统的控制

发布时间：2018-03-25 22:34

  本文选题：射电望远镜　切入点：主动反射面　出处：《光学精密工程》2016年07期

【摘要】：针对新疆奇台110m射电望远镜主动反射面控制技术的要求,设计和研制了一种新型的位移促动器和位移控制系统,并采用双频激光干涉仪对多个位移促动器及其控制系统进行了全面检测。位移促动器采用了基于涡轮蜗杆加滚珠丝杆的高精度结构设计方案,控制器系统采用了ARM微处理器。最后选择S曲线加速控制方法,设计了主动反射面控制系统硬件平台和软件算法。基于双频激光干涉仪和光学隔振平台在恒温超洁净条件下进行了系列测试。结果表明:系统实现了行程范围为30mm,控制精度为5μm RMS的快速精密控制;在额定负载300kg,步长2mm,行程30mm范围内,实测结果平均值与理论值偏差为0.04%,标准偏差为3.67μm。最后,采用测量精度为0.25μm的激光传感器对4块四点支撑的四边形子面板进行了验证检测。结果显示:经多次迭代后主动反射面控制闭环系统的控制精度小于5μm RMS,远远优于3mm波段射电望远镜主动反射面控制的技术要求。
[Abstract]:A new displacement actuator and displacement control system is designed and developed to meet the requirements of the active reflector control technology of Xinjiang Qitai 110m radio telescope. The dual frequency laser interferometer is used to detect several displacement actuators and their control systems. The displacement actuators adopt a high precision structure design scheme based on turbine worm and ball wire rod. The ARM microprocessor is used in the controller system. Finally, the S-curve acceleration control method is selected. The hardware platform and software algorithm of active reflector control system are designed. Based on dual-frequency laser interferometer and optical vibration isolation platform, a series of tests are carried out under the condition of constant temperature and ultra-clean. The results show that the travel range of the system is as follows:. 30mm fast precision control with control precision of 5 渭 m RMS; In the range of 300kg rated load, 2mm step and 30mm range, the deviation between the measured results and the theoretical value is 0.04 and the standard deviation is 3.67 渭 m. Four quadrilateral quadrilateral panels supported by four points are verified and detected by using a laser sensor with measuring precision of 0.25 渭 m. The results show that the control accuracy of the active reflector control closed-loop system is less than 5 渭 m RMS after several iterations, which is far superior. Technical requirements for active Reflector Control of Radio Telescope in 3mm Band.
【作者单位】： 中国科学院国家天文台南京天文光学技术研究所;中国科学院南京天文光学技术研究所天文光学技术重点实验室;中国科学院大学;
【基金】：国家自然科学基金资助项目(No.U1331204) 国家重点基础研究发展计划(No.2015CB857100)
【分类号】：TH751
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本文编号：1665154