Linear interferometric image processing for analysis of a particle in a volume

A method of extracting the number of fringes/fringe spacing of compression interferogram based on a wavelet-matched filter and Fourier transform technique is proposed, and sub-pixel accuracy of the extracted frequency is achieved by the modified Rife algorithm. Both numerical simulation and experimental measurement are carried out to verify the performance of the method. The measurement uncertainty is +/- 1.118 mu m and the absolute error is 1 : 873 mu m for standard particles of diameter 45 mu m. The research results show that the algorithm presented in this paper is feasible, and is promising for application to a high-density spray field.