In recent years, the measurement of specular aspheric surface has attracted intensive attention in precision engineering. Phase measuring deflectometry is a powerful measuring technique, which could accurately measure specular surfaces. The software configurable optical test system and a four step phase shifting approach are applied to obtain the normal vectors of the measured surface. The geometric parameters are recalculated by optimization to improve the calibration accuracy. Then the surface is reconstructed using a optimization algorithm. The configuration parameters should be set according to specific surface shapes and measuring conditions. Numerical experiments demonstrate that good performance can be achieved using this method.
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