Measurement of surface profiles using back-propagation method based on multi-period fringe projection method
基于多周期条纹投影技术的位相逆推法在物体表面形状测量中的应用

A measurement method of surface profiles using multi-period fringe projection method is put forward in this paper. Interference fringes with different periods are projected on an object surface. Multi-period fringe projection method not only has a higher measurement accuracy but also is suitable for measuring surface profiles with discontinuity. In addition, a new space phase analysis method based on multi period fringe projection method is proposed: Back-propagation Method. The distance of the backpropagation provides the position of the object surface. The simulation analysis and experiments show that this method can measure an object surface with discontinuities of several millimeters with high accuracy of several micrometers.