Coherent and incoherent imaging through scattering media (Conference Presentation)

Eitan Edrei

doi:10.1117/12.2253297

24 April 2017 Coherent and incoherent imaging through scattering media (Conference Presentation)

Eitan Edrei

Proceedings Volume 10073, Adaptive Optics and Wavefront Control for Biological Systems III; 100730U (2017) https://doi.org/10.1117/12.2253297
Event: SPIE BiOS, 2017, San Francisco, California, United States

Abstract

The shower-curtain effect is a familiar phenomenon, routinely observed in our everyday life: an object placed behind a scattering layer appears blurred but if the object is attached to the scattering layer it can be clearly resolved. The optical system we developed takes advantage of the shower-curtain effect properties and generalizes them to achieve high-resolution imaging of objects placed at a nearly arbitrary distance behind the scattering medium. The imaging procedure is based on retrieving the object Fourier transform from the turbid medium (used as the shower-curtain) through a correlography technique based on speckle illumination. Illuminating the object with a speckle pattern rather than a coherent beam, we show that the correlography principles can be effectively applied in the near field. While the far-field condition is usually known as z<(2D^2)⁄λ (D, size of the object; λ wavelength); by tuning the spatial coherence of the illumination beam, as one can do with speckle illumination, the “far-field” condition can be written as z<(2DRc)⁄λ where Rc is the correlation radius of the speckle pattern. Using our method we present high-resolution imaging of objects hidden behind millimeter-thick tissue or dense lens cataracts, and demonstrate our imaging technique to be insensitive to rapid medium movements (<5 m∕s) beyond any biologically relevant motion. Furthermore, we show this method can be extended to several contrast mechanisms and imaging configurations.

Conference Presentation

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Eitan Edrei "Coherent and incoherent imaging through scattering media (Conference Presentation)", Proc. SPIE 10073, Adaptive Optics and Wavefront Control for Biological Systems III, 100730U (24 April 2017); https://doi.org/10.1117/12.2253297

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KEYWORDS

Coherence imaging

Scattering

Scattering media

Speckle

Speckle pattern

Fourier transforms

Imaging systems

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