Comparative analysis of through‐transmission ultrasonic bulk wave methods for phase velocity measurements in anisotropic materials

1994 ◽  
Vol 95 (6) ◽  
pp. 3204-3212 ◽  
Author(s):  
Y. C. Chu ◽  
S. I. Rokhlin
Keyword(s):  
Comparative Analysis ◽  
Phase Velocity ◽  
Anisotropic Materials ◽  
Bulk Wave ◽  
Velocity Measurements ◽  
Wave Methods

scholarly journals Simultaneous velocity measurement of phases in a liquid-gas system

2017 ◽  
Vol 38 (4) ◽  
pp. 577-585
Author(s):  
Radosław Musoski ◽  
Jacek Stelmach
Keyword(s):  
Comparative Analysis ◽  
Phase Velocity ◽  
Velocity Measurement ◽  
Fluorescent Dye ◽  
Measuring System ◽  
Velocity Measurements ◽  
Phase Velocities ◽  
Dye Tracer ◽  
Sequential Measurement ◽  
Gas System

Abstract Results of velocity measurements of liquid and gas bubbles in a tank with a self-aspirating disk impeller are analysed. Studies were carried out using a fluorescent dye tracer in the measuring system with two cameras (simultaneous phase velocity measurement) and with one camera (sequential measurement of phase velocity). Based on a comparative analysis of the acquired data it was found that when differences in the phase velocities were small the simultaneous velocity measurement gave good results. However, sequential measurement gives greater possibilities for setting the measuring system and if the analysis of instantaneous velocities is not necessary, it seems to be a better solution.

Mathematical methods for the characterization of ultrasound in anisotropic materials

2000 ◽  
Vol 78 (9) ◽  
pp. 803-821 ◽  
Author(s):  
B O'Neill ◽  
R Gr. Maev
Keyword(s):  
Wave Propagation ◽  
Acoustic Waves ◽  
Asymptotic Theory ◽  
Anisotropic Materials ◽  
Bulk Wave ◽  
Mathematical Methods ◽  
Theoretical Methods ◽  
The Past ◽  
Fundamental Equations

Although the fundamental equations for the propagation of elastic and acoustic waves in anisotropic materials have not changed in more than a 100 years, the last few decades have seen a surge in interest in the topic. Much of this interest stems from the growing need for characterization of an increasing number of exotic materials. The intent of this paper is to review, for the benefit of beginning researchers in acoustics and ultrasonics, the fundamental phenomena related to elastic wave propagation in anisotropic media. We also present the most common and interesting theoretical methods developed over the past 20 years to model bulk wave propagation in such media. The methods discussed include plane wave superpositions, ray asymptotic theory, paraxial beams, and Green's functions. More peripheral issues, including anisotropic effects combined with various other exotic effects, are dealt with in the bibliography. PACS No.: 43.90

scholarly journals Surface Wave Tomography of the Alps Using Ambient-Noise and Earthquake Phase Velocity Measurements

2018 ◽  
Vol 123 (2) ◽  
pp. 1770-1792 ◽  
Author(s):  
Emanuel D. Kästle ◽  
A. El-Sharkawy ◽  
L. Boschi ◽  
T. Meier ◽  
C. Rosenberg ◽  
...  
Keyword(s):  
Surface Wave ◽  
Phase Velocity ◽  
Ambient Noise ◽  
Surface Wave Tomography ◽  
Velocity Measurements ◽  
Wave Tomography ◽  
The Alps

scholarly journals The Passive Surface Wave Methods for Shallow Engineering Exploration Based on the ESPAC Technology

2019 ◽  
Vol 131 ◽  
pp. 01041
Author(s):  
Tong Wu ◽  
Kezhu Song ◽  
Zhengyang Sun ◽  
Hongwei Zhao ◽  
Xin Hu
Keyword(s):  
Surface Wave ◽  
Phase Velocity ◽  
Velocity Dispersion ◽  
Vertical Component ◽  
Original Data ◽  
Phase Velocity Dispersion ◽  
Wave Phase Velocity ◽  
Wave Methods ◽  
Rayleigh Wave Phase Velocity ◽  
Selection Of

ESPAC method is a rapidly emerging field of seismological research, which can reflect the physical properties of the Earth’s medium. In the process of using the ESPAC method, sometimes the noise of the original data is relatively large, and the raw data of each seismometer needs to be preprocessed, including operations such as de-averaging, de-trending, re-sampling, normalization, and filtering. The selection of the normalized method and the selection of the bandwidth of the filter are particularly important, and it will produce the wrong result if not handled properly. This article attempts to use the extended spatial autocorrelation (ESPAC) method to extract Rayleigh-wave phase velocity dispersion curves from the vertical component of the seismic stations’ microtremors, and proposes feasible and effective solutions to the selection of the normalized method and bandwidth of bandpass filtering.

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