The Major Mirror of Stitching Technique by Extended Genetic Algorithms

The large aperture major mirror can be measured by subaperture techniques stitching the interferential testing results. The large aperture optical mirror can be measured by stitching technique. In order to reduce its accumulation error and improve the precision, Genetic Algorithms can be used to solve these questions in the article. By comparing the result of stitching interferometer with the whole plane, the difference of Peak-Valley is only 0.07λ (λequals to 633nm) and the number of root mean square is only 0.01λ. The difference of the results is in the tolerance of testing equipment (Veeco interferometer). From the study of experiment´s result, the Genetic Algorithms are the effective method to reduce the transfer and accumulation of error caused by the stitching theory in testing the large aperture optical mirror.