Phase difference determination by fringe pattern correlation

This paper presents a method of phase difference determination by fringe pattern correlation in interferometry. In the method, the phase difference between two fringe patterns is determined by fringe pattern correlation and linear interpolation with subpixel accuracy. The experiment shows that this method is useful for the determination of phase difference between two equi-spaced fringe patterns in interferometry, and it has the advantages of high precision of measurement and high resistance to noise.