Fig. 1. Schematic of SASI method to detect aspherical surface

Fig. 2. Lightpath diagram of aspherical surface test using SASI method

Fig. 3. Lightpath model of aspheric test using SASI method

Fig. 4. Simulated interferograms and changing rate curves of OPD. (a) Simulated interferogram by interferometer; (b) changing rate of OPD measured by interferometer; (c) simulated interferogram by SASI method; (d) changing rate of OPD measured by SASI method

Fig. 5. Measurement data before and after unifying the reference standard. (a) Before unifying the reference standard; (b) after unifying the reference standard

Fig. 6. Actual surface error and aspherical surface error and residual measured by SASI method. (a) Actual surface error; (b) surface error measured by SASI method; (c) surface residual by SASI method

Fig. 7. Schematic of actual measuring system

Fig. 8. Collected interferograms in the experiment. (a) Aspherical surface measuring by interferometer; (b) aspherical surface measuring by SASI method

Fig. 9. Testing results of aspheric surface. (a) Testing result by SASI method; (b) testing result by Luphoshcan method; (c) residual between test results of SASI and Luphoscan methods