نتایج جستجو برای: multiple scattering

تعداد نتایج: 866732  

Journal: :Journal of the Optical Society of America. A, Optics, image science, and vision 2014
Mohamed-Taha Rouabah Marina Samoylova Romain Bachelard Philippe W Courteille Robin Kaiser Nicola Piovella

We interpret cooperative scattering by a collection of cold atoms as a multiple-scattering process. Starting from microscopic equations describing the response of N atoms to a probe light beam, we represent the total scattered field as an infinite series of multiple-scattering events. As an application of the method, we obtain analytical expressions of the coherent intensity in the double-scatt...

1996
Jeroen Groenenboom Roel Snieder

Scattering of waves causes the coherent wave field to be attenuated and dispersed. These phenomena express the fact that the pulse loses coherence by which incoherent coda energy is created. First-order scattering theory violates the law of energy conservation and therefore cannot be used when the wave field is strongly distorted. An approximation is proposed which estimates the interaction bet...

2012
Edwin A. Marengo Maytee Zambrano-Nunez

The target position information contained in scattering data is explored in the context of the scalar Helmholtz operator for the basic twopoint scatterer system by means of the statistical estimation framework of the Fisher information and associated Cramér-Rao bound (CRB) relevant to unbiased position estimation. The CRB results are derived for the exact multiple scattering model and, for refe...

Journal: :Applied optics 1997
W V Meyer D S Cannell A E Smart T W Taylor P Tin

We describe a new method for characterizing particles in turbid media by cross correlating the scattered intensity fluctuations at two nearby points in the far field. The cross-correlation function selectively emphasizes single scattering over multiple scattering. The usual dynamic light-scattering capability of inferring particle size from decay rate is thus extended to samples that are so tur...

2004
Zhen Ye

This paper considers acoustic scattering by and propagation through line and plane arrays of air-bubbles in liquid media. The self-consistent method is used to derive the effective scattering function of a single bubble embedded in the arrays, incorporating all multiple scattering processes. For the line case, an exact result is derived. In the plane array situation, only an approximate analyti...

Journal: :Applied optics 2005
Edouard Berrocal Dmitry Y Churmakov Vadim P Romanov Mark C Jermy Igor V Meglinski

Sprays and other industrially relevant turbid media can be quantitatively characterized by light scattering. However, current optical diagnostic techniques generate errors in the intermediate scattering regime where the average number of light scattering is too great for the single scattering to be assumed, but too few for the diffusion approximation to be applied. Within this transitional sing...

1994
C. R. Chinn Ch. Elster R. M. Thaler S. P. Weppner

The optical model potentials for nucleon-nucleus elastic scattering at 65 MeVtiple scattering theory, following the prescription of the spectator expansion, where the only inputs are the free NN potentials, the nuclear densities and the nuclear mean field as derived from microscopic nuclear structure calculations. These potentials are used to predict differential cross sections, analyzing power...

2008
C. R. Chinn Ch. Elster R. M. Thaler S. P. Weppner

Measurements of neutron total cross-sections are both extensive and extremely accurate. Although they place a strong constraint on theoretically constructed models, there are relatively few comparisons of predictions with experiment. The total cross-sections for neutron scattering from 16 O and 40 Ca are calculated as a function of energy from 50 − 700 MeV laboratory energy with a microscopic f...

2007
C M Linton

One of the most successful techniques for handling multiple scattering is the so-called T-matrix approach in which the full linear solution can be computed once it has been determined how each individual element of an array scatters an arbitrary incident field. In the context of water waves this theory was originally formulated in [1] for constant finite depth, and extended to the deep water ca...

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