The subaperture stitching interferometry can effectively extend the vertical dynamic range and enhance the lateral resolution. However, some problems must be solved before the method may be applied to aspheric surfaces. Theses problems include lattice design, nulling and interferometric testing of subapertures, and development of the subaperture stitching algorithm, etc. Among these the reliability and robustness of the stitching algorithms are fundamental and challengeable. Unlike conventional approaches, we formulate the problem from the geometrical point of view and propose an iterative stitching algorithm. It is efficient by virtue of the alternating optimization technique and the successive linearization method. The algorithm is immune to fairly big parameter (including the motion parameter) uncertainties. Finally subaperture testing experiments are performed with a paraboloid mirror, which verify the validity of the proposed methods and algorithms.
展开▼
