Alignment error for aspheric surfaces monnull stitching testing

The alignment error model is established to eliminate the influence of alignment error on sub-aperture stitching test for aspheric surface. The characteristics and effects of alignment error on the testing results are analyzed based on the alignment error model. So the stitching model with the alignment error compensation is proposed for aspheric surface non-null testing. Simulations and experiments are given to verify the validity and precision of the proposed algorithm. The result shows that the proposed method with alignment error compensation is quite efficient to improve the stitching accuracy, and the calibration precision of PV is up to 0.03λ.