激光扫描仪测量天线结构变形研究进展

Progress in Research of Deformations of Antenna Structures by Laser Scanner Measurements

激光扫描测量方法具有快速、自动和非接触等优点,但是测量精度在毫米量级。综述了激光扫描仪在天线结构变形测量中的应用,它可以对望远镜的焦距及信号路径长度变化、VLBI参考点的稳定性和面板错位等进行有效测量。同时介绍了提高系统测量精度的关键技术,包括2面测量和现场标定等测量手段,简化点云、增加修正系数和正交距离回归等数据处理方法。这些方法和结果可为高效测量射电望远镜天线结构的变形提供参考。

The laser scanning measurement method has the advantages of fast,automatic and non-contact,but its measurement accuracy is on the order of millimeter.It is necessary to study how to ensure measurement accuracy and what measurements can be made with existing accuracy.This paper reviews the progress of laser scanner applied for measuring the deformations of antenna structures.It can effectively measure the focal length variations and signal path length variations,stability of reference point of VLBI and panel misalignment.Simultaneously,we list the key technologies to improve the measurement accuracy of the system,including the measurement methods of two-face measurement and in-suit calibration,and data processing methods of optimizing point cloud,adding correction coefficients and orthogonal distance regression.Laser scanning measurement provides guarantee for monitoring structural deformations and improving VLBI measurement accuracy.The investigated results provide a reference for the efficient measurement of antenna structure deformation of radio telescope.