Testing errors and its influence of the large aperture optical elements

In this paper, the power spectral density was employed as the specification criterion of the large aperture optical elements. The transfer function of the testing system has been demarcated. Furthermore, the main errors appeared in the testing process and their influences have been discussed in detail. The results show that the low frequency erroe,which caused by the plcement, affect the testing result. And the high frequency error, which caused by the interfeerene, does not have more effect on the testing.