Research On Technique Of Large Aperture Optical Components Test Based On Sub-aperture Stitching

Sub-aperture stitching is a virtual method for measuring large aperture optical components with low cost and high resolution by a small aperture interferometer.In this thesis, the theory of sub-aperture stitching is investigated first, including selection of stitching modes and setting of the number of sub-apertures. Secondly, a program based on the improved "Local Error Averaging Method" for sub-aperture stitching is compiled, and correctness of the program is validated by simulation. A platform is established for sub-aperture stitching test, and then the experimental stitching that test the 120mm×120mm optical component by nine 60mmx60mm planar sub-apertures is performed. The result is that the error of PV is 2% and RMS is only 0.27%. Finally, experimental research is conducted on the influence of stitching accuracy by sub-aperture overlapping area and stitching modes. The results show that increasing the sub-aperture overlapping area can enhance the stitching accuracy when the number of sub-apertures is unchangeable, and serial stitching is better than parallel stitching at controlling the stitching accuracy.