Abstract
Abstract
With the increasingly widespread application of freeform lenses, the detection of lens dioptric power presents a challenge. To measure the surface dioptric power of freeform lenses, a wavefront detection system for eyeglass lenses based on transmissive phase measuring deflectometry has been developed. The system consists only of a monitor, an industrial camera, and the lens under test. In response to the phase errors introduced by nonlinear devices, a Frequency Domain Gamma Error Correction Algorithm based on Linear Regression (FDLR) is proposed to optimize the system detection process and enhance detection accuracy. In the experiments, the proposed system was used to measure the wavefront and surface dioptric power of both spherical lens and progressive addition lens. The results were compared with those obtained from a focimeter to verify the accuracy and reliability of the system. Furthermore, a comparison of the detection results for progressive addition lens before and after phase error correction was conducted to demonstrate the necessity and effectiveness of the proposed phase error correction algorithm.