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Anomalous incident-angle and elliptical-polarization rotation of an elastically refracted P-wave.

Fa L, Fa Y, Zhang Y, Ding P, Gong J, Li G, Li L, Tang S, Zhao M - Sci Rep (2015)

Bottom Line: This anomalous incident-angle is found to be located in the post-critical incident-angle region corresponding to a refracted P-wave.For an inhomogeneously refracted and elliptically polarized P-wave at the anomalous incident-angle, its rotational direction experiences an acute variation, from left-hand elliptical to right-hand elliptical polarization.The new findings provide us an enhanced understanding of acoustical-wave scattering and lead potentially to widespread and novel applications.

View Article: PubMed Central - PubMed

Affiliation: School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an, Shaanxi 710121, China.

ABSTRACT
We report a newly discovered anomalous incident-angle of an elastically refracted P-wave, arising from a P-wave impinging on an interface between two VTI media with strong anisotropy. This anomalous incident-angle is found to be located in the post-critical incident-angle region corresponding to a refracted P-wave. Invoking Snell's law for a refracted P-wave provides two distinctive solutions before and after the anomalous incident-angle. For an inhomogeneously refracted and elliptically polarized P-wave at the anomalous incident-angle, its rotational direction experiences an acute variation, from left-hand elliptical to right-hand elliptical polarization. The new findings provide us an enhanced understanding of acoustical-wave scattering and lead potentially to widespread and novel applications.

No MeSH data available.


The calculated phase velocity curves for sandstone shale (S-shale) and calcareous sandstone (C-sandstone).
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f6: The calculated phase velocity curves for sandstone shale (S-shale) and calcareous sandstone (C-sandstone).

Mentions: It is worth noting that there is an anomalous incident-angle for the refracted P-wave, but no such an anomalous incident-angle θ(4) for the refracted SV-wave. As an example, let’s look at the interface between S-shale and C-sandstone. In this case, there are two critical incident-angles, i.e. and . The phase velocity of P-waves in S-shale is smaller than those of P-waves and SV-waves in C-sandstone (see Fig. 6). There is an anomalous incident-angle corresponding to the refracted P-wave at . However, even with the second critical incident-angle and the refracted SV-wave becoming an inhomogeneous wave for , we have not observed the existence of an anomalous incident-angle corresponding to the refracted SV-wave.


Anomalous incident-angle and elliptical-polarization rotation of an elastically refracted P-wave.

Fa L, Fa Y, Zhang Y, Ding P, Gong J, Li G, Li L, Tang S, Zhao M - Sci Rep (2015)

The calculated phase velocity curves for sandstone shale (S-shale) and calcareous sandstone (C-sandstone).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4525486&req=5

f6: The calculated phase velocity curves for sandstone shale (S-shale) and calcareous sandstone (C-sandstone).
Mentions: It is worth noting that there is an anomalous incident-angle for the refracted P-wave, but no such an anomalous incident-angle θ(4) for the refracted SV-wave. As an example, let’s look at the interface between S-shale and C-sandstone. In this case, there are two critical incident-angles, i.e. and . The phase velocity of P-waves in S-shale is smaller than those of P-waves and SV-waves in C-sandstone (see Fig. 6). There is an anomalous incident-angle corresponding to the refracted P-wave at . However, even with the second critical incident-angle and the refracted SV-wave becoming an inhomogeneous wave for , we have not observed the existence of an anomalous incident-angle corresponding to the refracted SV-wave.

Bottom Line: This anomalous incident-angle is found to be located in the post-critical incident-angle region corresponding to a refracted P-wave.For an inhomogeneously refracted and elliptically polarized P-wave at the anomalous incident-angle, its rotational direction experiences an acute variation, from left-hand elliptical to right-hand elliptical polarization.The new findings provide us an enhanced understanding of acoustical-wave scattering and lead potentially to widespread and novel applications.

View Article: PubMed Central - PubMed

Affiliation: School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an, Shaanxi 710121, China.

ABSTRACT
We report a newly discovered anomalous incident-angle of an elastically refracted P-wave, arising from a P-wave impinging on an interface between two VTI media with strong anisotropy. This anomalous incident-angle is found to be located in the post-critical incident-angle region corresponding to a refracted P-wave. Invoking Snell's law for a refracted P-wave provides two distinctive solutions before and after the anomalous incident-angle. For an inhomogeneously refracted and elliptically polarized P-wave at the anomalous incident-angle, its rotational direction experiences an acute variation, from left-hand elliptical to right-hand elliptical polarization. The new findings provide us an enhanced understanding of acoustical-wave scattering and lead potentially to widespread and novel applications.

No MeSH data available.