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Simultaneous Calibration Algorithm of Phase Shifting Based on FFT

Li Wansong Su Xianyu Su Likun Xiang Liqun (Opto Electronics Department, Sichuan Union University, Chengdu 610064) (Received 1 June 1998; revised 22 July 1998)  
In phase measuring profilometry (PMP), a new simultaneous calibration algorithm of phase shifting based on fast Fourier transform (FFT) is presented. The current phase shifting is calculated with the help of the information of a additional fringe pattern and a FFT modulation mask. With this algorithm, the moving of the project grating can be controlled accurately and simultaneously, the accuracy and the automation of the measuring system are improved greatly.
【Fund】: 国家自然科学基金
【CateGory Index】: O438.2
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