Abstract
Imaging of a periodic amplitude object is investigated in association with periodicity in spatially partially coherent illumination produced by ultrasonic wave modulation. Because of this periodicity, the image contrast can be much more enhanced in the presence of the ultrasonic wave than that obtained with a coherent or incoherent imaging system. The most efficient contrast enhancement takes place when the period of the object equals half of the ultrasonic wavelength and the acousto-optic diffraction component of the first order takes a maximum. Theoretical predictions are verified experimentally.
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