Abstract: Based on statistical optics, mechanism and principle of dual-beam speckle interferometry are studied, and its mathematical expression of frequency distribution is derived. The experimental shows an agreeable result with the theoretical analysis. The research shows that both the speckle photography and interference fringes exist in the dual-beam speckle pattern. The only interference fringe remains still as the filtering aperture moves. Besides, the interference fringe appears first, is gradually concentrated in pace with adding the load on a sample, and disappears at the same time with the photography fringe.!4
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