The performance of the radio telescope with 65 m diameter is determined by 1 008 pieces of mirrors assembly. The monolithic mirror produced by compound process with molded by vacuum adsorption and ejected by mould pressing must be taken full inspection for quality control. Based on the molding characteristics of the mirror, we established the measuring plane of it by the use of high precision mechanical gantry coordinate plane, got the measurement origin with approximation method and the benefit of the mirror's four-corner characteristics and created a more reasonable measurement system to get the measured data of the part.%口径65 m的射电天文望远镜的工作性能由1008片反射镜组装决定.对采用真空吸附再模压顶出成形复合工艺制成的单片反射镜,必须采取全检进行质量控制.根据反射镜的成形特点,利用龙门三坐标的高精度机械坐标面建立反射镜的测量平面,并借助反射镜的四角特点采用逼近法求得测量原点,较合理地建立起测量系统,获取了零件的测量数据.
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