Reflection of an acoustic wave from a bubble layer of finite thickness

2016 ◽  
Vol 61 (10) ◽  
pp. 499-501 ◽  
Author(s):  
D. A. Gubaidullin ◽  
Yu. V. Fedorov
Keyword(s):  
Acoustic Wave ◽  
Finite Thickness ◽  
Bubble Layer

scholarly journals Reflection of acoustic waves from the boundary or layer of two-phase medium

2018 ◽  
Vol 148 ◽  
pp. 15005
Author(s):  
D.A. Gubaidullin ◽  
D.D. Gubaidullina ◽  
Yu.V. Fedorov
Keyword(s):  
Reflection Coefficient ◽  
Acoustic Wave ◽  
Acoustic Waves ◽  
Finite Thickness ◽  
Low Frequency ◽  
Bubbly Liquid ◽  
Pure Liquid ◽  
Angle Of Incidence ◽  
Two Phase ◽  
Low Frequencies

The inclined incidence of the acoustic wave on a layer of gas-droplet mixture or bubbly liquid of finite thickness is theoretically investigated. In the case of the incidence of the low-frequency acoustic wave to interface between the pure gas and aerosol or to interface between pure liquid and bubbly liquid the basic laws of reflection and transmission of a wave are established. This circumstance allows us to evaluate the transmission and reflection coefficients, depending on the volume content of inclusions and the angle of incidence of the acoustic wave. In particular, for the interface between pure gas and aerosol analytical expressions of the critical angle of wave incidence at which reflection coefficient becomes zero are obtained, i.e. thus there is a complete passage of the acoustic wave through the interface. It is established that the increase of the angle of incidence of the acoustic wave on the boundary or layer of aerosol causes: first, either to increase or to decrease of the reflection coefficient at low frequencies, and second, to appearance of additional minima depending on the reflection coefficient from frequency of disturbances related to the difference of speed of sound and density of the medium.

Phase compensation acoustic wave cloak

2018 ◽  
Vol 32 (21) ◽  
pp. 1850237
Author(s):  
Lunwu Zeng ◽  
Wenjin Xie
Keyword(s):  
Acoustic Wave ◽  
Acoustic Pressure ◽  
Wave Reflection ◽  
Finite Thickness ◽  
Wave Theory ◽  
Phase Shifters ◽  
Half Wave ◽  
Simulation Results ◽  
Pressure Phase ◽  
Acoustic Phase

When acoustic wave is normally reflected from wave thinner medium of semi-infinite, the acoustic pressure phase of reflection wave changes [Formula: see text], or half-wave loss, when acoustic wave is reflected from wave denser medium of semi-infinite, the acoustic pressure phase of the reflection wave is invariant, or no wave loss, when acoustic wave is reflected from wave thinner (or denser) medium of finite thickness, the phase of the reflection wave changes. According to the acoustic wave theory, we derived the acoustic wave reflection coefficient and the phase shift, and designed various kinds of phase shifters. The simulation results show that acoustic phase shifters can cloak acoustic wave.

Low‐frequency acoustic wave generation in a resonant bubble layer

1994 ◽  
Vol 95 (5) ◽  
pp. 3019-3019 ◽  
Author(s):  
O. Druzhinin ◽  
L. Ostrovsky ◽  
A. Prosperetti
Keyword(s):  
Acoustic Wave ◽  
Low Frequency ◽  
Wave Generation ◽  
Acoustic Wave Generation ◽  
Bubble Layer

Low‐frequency acoustic wave generation in a resonant bubble layer

1996 ◽  
Vol 100 (6) ◽  
pp. 3570-3580 ◽  
Author(s):  
Oleg A. Druzhinin ◽  
Lev A. Ostrovsky ◽  
Andrea Prosperetti
Keyword(s):  
Acoustic Wave ◽  
Low Frequency ◽  
Wave Generation ◽  
Acoustic Wave Generation ◽  
Bubble Layer

The restoration of blurred electron micrographs

1986 ◽  
Vol 44 ◽  
pp. 180-181
Author(s):  
Bridget Carragher ◽  
David A. Bluemke ◽  
Michael J. Potel ◽  
Robert Josephs
Keyword(s):  
Cross Section ◽  
Electron Micrographs ◽  
Relative Motion ◽  
Finite Thickness ◽  
Image Plane ◽  
Helical Axis ◽  
Thin Sections ◽  
Structural Details

We have investigated the feasibility of restoring blurred electron micrographs. Two related problems have been considered; the restoration of images blurred as a result of relative motion between the specimen and the image plane, and the restoration of images which are rotationally blurred about an axis. Micrographs taken while the specimen is drifting result in images which are blurred in the direction of motion. An example of rotational blurring arises in micrographs of thin sections of helical particles viewed in cross section. The twist of the particle within the finite thickness of the section causes the image to appear rotationally blurred about the helical axis. As a result, structural details, particularly at large distances from the helical axis, will be obscured.

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