Are unexpected bulk waves produced by surface wave transducers?

1974 ◽  
Vol 25 (3) ◽  
pp. 127-128 ◽  
Author(s):  
R. W. Weinert ◽  
P. R. Emtage ◽  
J. de Klerk ◽  
Michael R. Daniel
Keyword(s):  
Surface Wave ◽  
Bulk Waves

Surface‐wave generation by nonlinear mixing of bulk waves

1979 ◽  
Vol 50 (1) ◽  
pp. 87-90 ◽  
Author(s):  
R. Normandin ◽  
G. I. Stegeman
Keyword(s):  
Surface Wave ◽  
Wave Generation ◽  
Bulk Waves ◽  
Nonlinear Mixing

Surface Wave Propagation in Thin Silver and Aluminium Films

2005 ◽  
Vol 60 (11-12) ◽  
pp. 789-796
Author(s):  
Anouar Njeh ◽  
Nabil Abdelmoula ◽  
Hartmut Fuess ◽  
Mohamed Hédi Ben Ghozlen
Keyword(s):  
Thin Films ◽  
Wave Propagation ◽  
Surface Wave ◽  
Surface Waves ◽  
Acoustic Waves ◽  
Frequency Interval ◽  
Constant Frequency ◽  
Surface Wave Propagation ◽  
Coated Materials ◽  
Bulk Waves

Three kinds of acoustic waves are known: bulk waves, pseudo-surface waves and surface waves. A plane wave section of a constant-frequency surface of a film serves as a hint for the expected nature. Calculations based on slowness curves of films reveal frequency ranges where each type of acoustic waves is predominant. Dispersion curves and displacement acoustic waves are calculated and commented in each frequency interval for different coated materials. Both dispersion and sagittal elliptical displacement are sensitive and depend on diagrams mentioned above. Silver and aluminium thin films having different anisotropy ratios, namely 2.91 and 1.21, are retained for illustration.

Dispersion and energy conservation relations of surface waves in semi-infinite plasma

1981 ◽  
Vol 25 (2) ◽  
pp. 285-307 ◽  
Author(s):  
V. Atanssov
Keyword(s):  
Surface Wave ◽  
Energy Conservation ◽  
Surface Waves ◽  
Low Frequency ◽  
Conservation Equation ◽  
Hydrodynamic Theory ◽  
Energy Conservation Equation ◽  
Surface Wave Propagation ◽  
Electric And Magnetic Fields ◽  
Bulk Waves

The hydrodynamic theory of surface wave propagation in semi-infinite homogeneous isotropic plasma is considered. Explicit linear surface wave solutions are given for the electric and magnetic fields, charge and current densities. These solutions are used to obtain the well-known dispersion relations and, together with the general energy conservation equation, to find appropriate definitions for the energy and the energy flow densities of surface waves. These densities are associated with the dispersion relation and the group velocity by formulae similar to those for bulk waves in infinite plasmas. Both cases of high-frequency (HF) and low-frequency (LF) surface waves are considered.

Reflection and Transmission of Waves in Pyroelectric Body

2010 ◽  
Author(s):  
Xiaoguang Yuan ◽  
ZhenBang Kuang
Keyword(s):  
Surface Wave ◽  
Boundary Conditions ◽  
Wave Vector ◽  
Interface Plane ◽  
Bulk Wave ◽  
Two Dimensional ◽  
Reflection And Transmission ◽  
Bulk Waves ◽  
Temperature Waves ◽  
Wave Vector Component

The reflection and transmission theory of waves in pyroelectric medium is studied in this paper. In general in an infinite homogeneous pyroelectric medium there are four bulk wave modes: quasi-longitudinal, two quasi-transversal and temperature waves. However there are five boundary conditions in the reflection and transmission problem of the pyroelectric medium. In this paper we find that the surface wave will be revealed to satisfy the boundary conditions with other four bulk waves. The surface wave has the same wave vector component with the incident bulk waves on the interface plane. The two dimensional reflection problems of waves at the interface between the semi-infinite pyroelectric medium and vacuum is researched and an numerical example is given.

Erratum: Are unexpected bulk waves produced by surface wave transducers?

1974 ◽  
Vol 25 (11) ◽  
pp. 678-678
Author(s):  
R. W. Weinert ◽  
P. R. Emtage ◽  
J. de Klerk ◽  
Michael R. Daniel
Keyword(s):  
Surface Wave ◽  
Bulk Waves

WAVE REFLECTION IN PIEZOELECTRIC HALF-PLANE

2013 ◽  
Vol 05 (02) ◽  
pp. 1350014 ◽  
Author(s):  
XIAOGUANG YUAN ◽  
Z. H. ZHU
Keyword(s):  
Surface Wave ◽  
Half Plane ◽  
Wave Reflection ◽  
Incident Angle ◽  
Wave Theory ◽  
Wave Mode ◽  
Piezoelectric Medium ◽  
Bulk Wave ◽  
Reflected Waves ◽  
Bulk Waves

The assumption of quasi-static electric field in the problem of wave reflection in piezoelectric half-plane results in missing an independent electric wave mode at the piezoelectric boundary, which leads to oversimplified solutions of reflected waves in a strong piezoelectric medium if only elastic bulk wave boundary conditions are considered. The paper presents a novel solution to address the issue by using the inhomogeneous wave theory and introducing a virtual reflection wave mode in addition to the elastic bulk wave modes. The virtual wave is assumed to satisfy the Snell's law as well as the piezoelectric boundary condition and can be treated in the same way as the elastic bulk waves. The analysis results show that this virtual wave always propagates along the boundary for any incident angle and can be treated as a pseudo surface wave. The energy transmission analysis reveals that this surface wave transmits zero energy and does not violate the energy conservation between the incident and the reflected elastic bulk waves. In addition, the analysis also reveals an interesting result that the quasi-transverse, not the quasi-longitudinal, incident wave will be fully reflected and no quasi-longitudinal reflected wave will be generated if the incident angle is beyond a critical angle.

Analysis of spurious bulk waves in ball surface wave device

Ultrasonics ◽  
2003 ◽  
Vol 41 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Satoru Ishikawa ◽  
Hideo Cho ◽  
Yusuke Tsukahara ◽  
Noritaka Nakaso ◽  
Kazushi Yamanaka
Keyword(s):  
Surface Wave ◽  
Bulk Waves ◽  
Ball Surface ◽  
Wave Device

Exit-surface wave reconstruction using a focal series

1992 ◽  
Vol 50 (2) ◽  
pp. 988-989
Author(s):  
W.J. de Ruijter ◽  
M.R. McCartney ◽  
David J. Smith ◽  
J.K. Weiss
Keyword(s):  
Surface Wave ◽  
Spherical Aberration ◽  
Data Extraction ◽  
High Sensitivity ◽  
Geometric Distortion ◽  
Variation Method ◽  
Objective Lens ◽  
Immediate Reconstruction ◽  
Exit Surface ◽  
Electron Microscopes

Further advances in resolution enhancement of transmission electron microscopes can be expected from digital processing of image data recorded with slow-scan CCD cameras. Image recording with these new cameras is essential because of their high sensitivity, extreme linearity and negligible geometric distortion. Furthermore, digital image acquisition allows for on-line processing which yields virtually immediate reconstruction results. At present, the most promising techniques for exit-surface wave reconstruction are electron holography and the recently proposed focal variation method. The latter method is based on image processing applied to a series of images recorded at equally spaced defocus.Exit-surface wave reconstruction using the focal variation method as proposed by Van Dyck and Op de Beeck proceeds in two stages. First, the complex image wave is retrieved by data extraction from a parabola situated in three-dimensional Fourier space. Then the objective lens spherical aberration, astigmatism and defocus are corrected by simply dividing the image wave by the wave aberration function calculated with the appropriate objective lens aberration coefficients which yields the exit-surface wave.

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