Multiple scattering effects on wave propagation due to rain

1980 ◽  
Vol 35 (11-12) ◽  
pp. 373-379
Author(s):  
Akira Ishimaru ◽  
Rudolf L. -T. Cheung
Keyword(s):  
Wave Propagation ◽  
Multiple Scattering ◽  
Scattering Effects ◽  
Multiple Scattering Effects

Wave propagation in heterogeneous media: Effects of fine-scale heterogeneity

Geophysics ◽  
2008 ◽  
Vol 73 (3) ◽  
pp. T37-T49 ◽  
Author(s):  
Florence Delprat-Jannaud ◽  
Patrick Lailly
Keyword(s):  
Wave Propagation ◽  
Wave Equation ◽  
Multiple Scattering ◽  
Stability Condition ◽  
Heterogeneous Media ◽  
Fine Scale ◽  
Fine Grid ◽  
Scale Heterogeneity ◽  
Scattering Effects ◽  
Multiple Scattering Effects

We study the multiple scattering effects caused by fine-scale heterogeneity. For this purpose, it is unreasonable to rely on a linearization of the dependency of the wavefield in the parameters that describe the medium. Therefore, the only tools that correctly model wave propagation are based on the numerical solution of the (two-way) wave equation by finite differences or finite elements. A fine grid provides a straightforward approach to account for fine-scale heterogeneity. In this situation, there is no need for high-order schemes. Variational methods allow us to exhibit a numerical scheme that accounts for heterogeneity and that is, by construction, stable, provided a stability condition is fulfilled. This condition is a sufficient-stability condition contrary to the classical necessary-stability conditions. In addition, general mathematical results prove the finite-difference solution is close to the solution of the wave equation when the grid is fine enough. The multiple scattering effects caused by fine-scale heterogeneity are very important. In particular, we observe that imaging the so-computed synthetic data by standard migration techniques (that assume a linearization of the above-mentioned dependency) shows a strongly noise-corrupted image. This illustrates the importance of preprocessing data to remove the effect of multiple scattering. We try to improve the signal-to-noise ratio by removing multiples related to the free surface. Although significant noise reduction is achieved, even more sophisticated preprocessing is required to obtain a clear image of the subsurface.

MULTIPLE SCATTERING EFFECTS IN THE COBALT K-EDGE EXAFS OF METAL CARBONYL COMPLEXES

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-589-C8-592
Author(s):  
N. BINSTED ◽  
S. L. COOK ◽  
J. EVANS ◽  
R. J. PRICE ◽  
G. N. GREAVES
Keyword(s):  
Multiple Scattering ◽  
Metal Carbonyl ◽  
Carbonyl Complexes ◽  
Metal Carbonyl Complexes ◽  
Scattering Effects ◽  
Multiple Scattering Effects

Multiple-scattering effects in mean-lifetime experiments by blocking technique

1972 ◽  
Vol 10 (2) ◽  
pp. 177-188 ◽  
Author(s):  
E. Fuschini ◽  
F. Malaguti ◽  
C. Maroni ◽  
I. Massa ◽  
A. Uguzzoni ◽  
...  
Keyword(s):  
Multiple Scattering ◽  
Scattering Effects ◽  
Mean Lifetime ◽  
Multiple Scattering Effects
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