大型天线表面精度实时检测

A new real-time holographic system for the surface diagnosis of the large reflector antennas

介绍一种大型天线表面精度实时检测仪 ,它可以检测出天线表面形变的位置和大小 ,通过实时调整天线面板 ,从而大大改善大型反射面天线的系统性能。在 2 2 GHz频段 ,使用强水脉泽源 Orion,对紫金山天文台的 1 3.7m毫米波望远镜进行了实测 ,检测结果与经典的经纬仪带尺方法测量所得的结果基本相符 ,测试精度约为 0 .1 6mm。

The performance of large reflector antennas can be improved by identifying the location and amount of their surface distortions and then by correcting them . Microwave holography techniques has proven to be convenient and quick with acceptable accuracy for performing this task. A new real time holographic measurement using astronomical source, has been performed after a surface alignment based on measurements with traditional methods (theodolite).The 22GHz water vapour maser source in Orion was observed on the 13.7 meter millimeter wave radio telescope of Purple Mountain Observatory. The new measuring error is about 0.16mm. A new holographic measurement system improving the good alignment is achieved. The holographic procedure is used routinely at different radio telescope sites in order to check the surface condition of the reflectors and adjust the displaced panels.