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A novel particle displacement measurement method using optical diffraction

A novel non-cross-correlation based diffraction method is proposed to measure fractional particle displacement. This method directly processes the complete set of spot intensity distribution information in the image plane without iteration. After subtracting two consecutive particle image velocimetry images, image pairs are identified and each peak height reveals local displacement. This method possesses the potential of being able to calculate the accurate sub-pixel displacement at a significant reduction in computational cost and reveals sub-pixel displacement variations across finite interrogation regions.