Far-field subwavelength imaging for ultrasonic elastic waves in a plate using an elastic hyperlens

2011 ◽  
Vol 98 (24) ◽  
pp. 241912 ◽  
Author(s):  
Hyung Jin Lee ◽  
Hoe Woong Kim ◽  
Yoon Young Kim
Keyword(s):  
Elastic Waves ◽  
Far Field ◽  
Subwavelength Imaging

Robust far-field subwavelength imaging of scatterers by an acoustic superlens

2019 ◽  
Vol 146 (6) ◽  
pp. 4131-4143
Author(s):  
Yongkang Dong ◽  
Gaokun Yu ◽  
Ning Wang
Keyword(s):  
Far Field ◽  
Subwavelength Imaging

Multiple scattering of plane harmonic elastic waves in an infinite solid by an arbitrary configuration of obstacles

1969 ◽  
Vol 66 (2) ◽  
pp. 469-480 ◽  
Author(s):  
P. J. Barratt
Keyword(s):  
Scattering Amplitudes ◽  
Integral Equations ◽  
Multiple Scattering ◽  
Elastic Waves ◽  
Iterative Procedure ◽  
Elastic Solid ◽  
Single Scattering ◽  
Far Field ◽  
Rigid Spheres ◽  
Arbitrary Configuration

AbstractThe multiple scattering of plane harmonic P and S waves in an infinite elastic solid by arbitrary configurations of obstacles is considered. Integral equations relating the far-field multiple scattering amplitudes to the corresponding single scattering functions are obtained and asymptotic solutions are found by an iterative procedure. The scattering of a plane harmonic P wave by two identical rigid spheres is investigated.

A topology optimisation for far-field characteristics of elastic waves scattered from periodic structures

2018 ◽  
Vol 2018.13 (0) ◽  
pp. 103
Author(s):  
Kei MATSUSHIMA ◽  
Hiroshi ISAKARI ◽  
Toru TAKAHASHI ◽  
Toshiro MATSUMOTO
Keyword(s):  
Elastic Waves ◽  
Periodic Structures ◽  
Topology Optimisation ◽  
Far Field

A far-field scattering model in textured polycrystals with ellipsoidal grains of arbitrary crystal symmetry

2020 ◽  
Vol 25 (5) ◽  
pp. 1155-1171
Author(s):  
Gaofeng Sha
Keyword(s):  
Elastic Waves ◽  
Field Approximation ◽  
Crystal Symmetry ◽  
Polycrystalline Materials ◽  
Far Field ◽  
Efficient Tool ◽  
Practical Applications ◽  
Full Wave ◽  
Non Destructive ◽  
High Computational Efficiency

Modeling the scattering-induced attenuation of elastic waves in heterogeneous polycrystals has practical applications in seismology and non-destructive evaluation. However, attenuation modeling for polycrystals with preferred crystallographic orientation (statistically anisotropic or textured polycrystals) has not been well studied. The far-field approximation (FFA) model, which is applicable for arbitrary crystal (triclinic) symmetry and valid for the whole frequency range (Rayleigh region, stochastic regime, and geometric region), has been reported for texture-free polycrystalline materials. This paper extends the FFA model to textured polycrystals with ellipsoidal grains of arbitrary crystal symmetry. This FFA model for textured polycrystals encompasses two advantages: a simple form of dispersion equation and high computational efficiency. Furthermore, this FFA model can predict both the attenuation and phase velocity of elastic waves in textured polycrystals. The FFA model in this study has also been validated by comparison with the full-wave second-order attenuation model on textured polycrystals of triclinic grains. This work provides a simple and efficient tool to predict the elastic wave behavior in heterogeneous polycrystalline materials.

scholarly journals Cascaded DBR plasmonic cavity lens for far-field subwavelength imaging at a visible wavelength

2018 ◽  
Vol 26 (15) ◽  
pp. 19574 ◽  
Author(s):  
Huiyu Li ◽  
Liwei Fu ◽  
Karsten Frenner ◽  
Wolfgang Osten
Keyword(s):  
Far Field ◽  
Subwavelength Imaging ◽  
Visible Wavelength

Axisymmetric Elastic Waves Excited by a Point Source in a Plate

1982 ◽  
Vol 49 (4) ◽  
pp. 821-836 ◽  
Author(s):  
R. L. Weaver ◽  
Yih-Hsing Pao
Keyword(s):  
Point Source ◽  
Stationary Phase ◽  
Elastic Plate ◽  
Elastic Waves ◽  
Normal Modes ◽  
Integral Transforms ◽  
Far Field ◽  
Exact Results ◽  
Ray Theory ◽  
Vertical Step

The response of an infinite elastic plate to dynamic loading is presented by the method of superposition of normal modes, a method particularly appropriate in the intermediate and far field. The method is compared with the method of integral transforms. Explicit expressions are given for the case of loading by a concentrated vertical step force. These expressions are evaluated numerically over a range of distances from 4 to 40 plate thicknesses. The numerical results are compared with qualitative stationary phase analyses and with the exact results of generalized ray theory.

Sign in / Sign up

Export Citation Format

Share Document