15 September 2006 Speckle analysis of the microwave field in transmission through random media
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Proceedings Volume 6341, Speckle06: Speckles, From Grains to Flowers; 63411E (2006) https://doi.org/10.1117/12.695367
Event: Speckle06: Speckles, From Grains to Flowers, 2006, Nimes, France
Abstract
We explore the specific nature of wave propagation in multiple scattering media and examine how this is revealed in various aspects of the speckle pattern measured at the output surface of an ensemble of disordered media. We present near-field measurements of the speckle pattern transmitted through random samples in a quasi-one dimensional geometry. The microwave field -amplitude and phase- is measured as a function of frequency on a grid of points on the output surface of samples composed of randomly positioned dielectric spheres. The field and intensity correlation functions versus displacement and frequency shift are measured and reveal non-Gaussian behavior, namely long range correlation. The widest fluctuations of the phase derivative with frequency are found at low intensity values near a phase singularity in the transmitted speckle pattern. The position of these phase singularities at which the intensity vanishes is reconstructed for the entire speckle pattern and followed in space while frequency is shifted.
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Patrick Sebbah, Patrick Sebbah, Bing Hu, Bing Hu, Azriel Z. Genack, Azriel Z. Genack, } "Speckle analysis of the microwave field in transmission through random media", Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 63411E (15 September 2006); doi: 10.1117/12.695367; https://doi.org/10.1117/12.695367
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