This paper presents a method of eliminating the error introduced by the nonuniform diffraction halo in speckle photography. It is shown that, by proper aperturing of the imaging lens, the intensity distribution in the diffraction halo can be made constant over a certain frequency range. The measurements made on Young's fringes, present in this region, would be free from error due to varying intensity in the diffraction halo.
© 1986 Optical Society of America
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