Edge Imaging with Mutually Incoherent Point Sources

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Abstract
Edge imaging by using mutually incoherent point sources is investigated in relation to the ringing effect. The coherence state of the illumination is characterized by a periodic form that depends on the arrangement of the sources. The image intensity is formulated in a simple form as the incoherent superposition resulting from the periodicity in the coherence state. In the experiments, such point sources are provided by using a single-mode optical fibre in which the diffracted light of an acoustic wave is propagated. Both the experimental and the computed results show that ringing is successfully suppressed when the asymmetrically arranged sources are separated from one another by a distance of half the aperture of the imaging system.

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