Measurement of rotationally symmetric aspherical surfaces with the annular subaperture stitching method

The annular subaperture stitching method is an effective method for testing rotationally symmetric aspherical surfaces. To create a full aperture map of this kind of asphere, we propose an annular subaperture stitching algorithm. The algorithm is based on triangulation interpolation theory, least-square fitting method, and ray tracing method. We first show the principle of our stitching algorithm. Then, the performance of the proposed method is analyzed by simulation testing to evaluate the accuracy of the above algorithm. In the end, the experiment is given to demonstrate the correctness of our method. Both the simulation and experiment results show that the introduced method is quite effective for the testing of rotationally symmetric aspherical surfaces.