Abstract:
In order to improve the accuracy of Fourier transform profilometry and reduce the influence of frequency aliasing. A convenient method to suppress the zero frequency components is proposed. By collecting a sinusoidal fringe pattern and adding a fixed thickness parallel plate to the front of the projector, a new fringe pattern is obtained by refraction. The two deformed fringe patterns are processed to get the stripe pattern of zero frequency elimination. After the proper fast Fourier transform of the fringe pattern, the spectrum is filtered and the fundamental frequency components are extracted. The measurement system is simple and high-speed compared to the installation of precision phase shifting devices. The feasibility of this method is proved by theory and experiment.