Path planning and surface fitting are the key technologies in the non-axisymmetric aspheric measuring. In accordance with the requirements of high-precision compensation machining for parallel grinding of non-axisymmetric aspheric lens, in this paper, measuring paths are planned based on the machining error. The measuring system is designed and carried out. The nonlinear least square fitting method is adopted in surface fitting for the non-axisymmetric aspheric lens and the surface quality of optical lens is effectively estimated by the fitting error. The experiment result indicates that the fitting residual error is in the 10^-3mm magnitude order, which can meet the request of compensation machining. By comparing with the theory equation, the original data for compensation machining can be obtained, and the accuracy of compensation machining is well controlled.

Date Published: 31 December 2008
PDF: 7 pages
Proc. SPIE 7130, Fourth International Symposium on Precision Mechanical Measurements, 71300I (31 December 2008); doi: 10.1117/12.819554

Published in SPIE Proceedings Vol. 7130:
Fourth International Symposium on Precision Mechanical Measurements
Yetai Fei; Kuang-Chao Fan; Rongsheng Lu, Editor(s)