Precise optical measurement of surface contour of large paraboloid antenna

A chord-angle method is proposed for the precise optical measurement of the surface contour of large and medium size paraboloid antenna. The possible errors of the proposed method are theoretically analyzed as a whole. The antenna surface measurement precision is controlled and adjusted by measuring the angle and chord length of the measuring target point on the antenna surface. The effectiveness of the proposed method is verified through measurements. Experimental results indicate that the chord-angle method is effective and it has wide application prospect. Compared to the conventional template method, this direct measurement method has higher precision and better applicability.