Testing of precise mirror based on subaperture stitching

In order to solve stitching testing of precise optical flat mirror, based on least squares fitting, we established reasonable stitching algorithms and mathematical models. In addition, relative program was written and a 120 mm precise flat mirror was tested with stitching method. A marked point was used to accomplish the alignments between subspertures. At the same time, relative stitching accuracy was analyzed based on the full aperture testing result and self-examination subaperture testing result. It is proved from the experiment results that there is no gap in the stitching result. The peak value(PV) and root-mean-square(RMS) errors between stitching results and full aperture testing results are 0.020 and 0.002 respectively. The stitching result is in consistent with the full aperture testing result and self-examination testing result, respectively, which proves the reliability and accuracy of the stitching.