Acoustic diffraction by an absorbing finite strip in a moving fluid

1988 ◽  
Vol 83 (2) ◽  
pp. 812-816 ◽  
Author(s):  
S. Asghar
Keyword(s):  
Finite Strip ◽  
Acoustic Diffraction ◽  
Moving Fluid

30.—Acoustic Diffraction by an Absorbing Semi-infinite Half Plane in a Moving Fluid

1975 ◽  
Vol 72 (4) ◽  
pp. 337-357 ◽  
Author(s):  
A. D. Rawlins
Keyword(s):  
Fluid Flow ◽  
Half Space ◽  
Half Plane ◽  
Line Source ◽  
Subsonic Flow ◽  
Sound Intensity ◽  
Acoustic Diffraction ◽  
Radiated Sound ◽  
Acoustic Instabilities ◽  
Moving Fluid

SynopsisThe diffraction of a line source of sound by an absorbing semi-infinite half plane in the presence of a fluid flow is examined. It is found that the radiated sound intensity, in the half space in which the source is located, can be considerably reduced by a suitable choice of the absorption parameter. For subsonic flow the system exhibits no acoustic instabilities.

7.—Acoustic Diffraction by an Absorbing Semi-Infinite Plane in a Moving Fluid, II

1976 ◽  
Vol 75 (2) ◽  
pp. 83-95 ◽  
Author(s):  
A. D. Rawlins
Keyword(s):  
Fluid Flow ◽  
Sound Intensity ◽  
Leading Edge ◽  
Present Situation ◽  
Sound Level ◽  
Infinite Plane ◽  
Trailing Edge ◽  
Acoustic Diffraction ◽  
Radiated Sound ◽  
Moving Fluid

SYNOPSISThe diffraction of a line source by an absorbing semi-infinite plane in the presence of a subsonic fluid flow is examined. Expressions for the total far field for the leading edge (no wake present) and the trailing edge (wake present) situation are given.It is found that the presence of fluid flow attenuates the sound level in the shadow region of the absorbent screen. There is greater attenuation of the sound level in the trailing edge situation than there is for the leading edge situation.Sound level attenuation on the source side of the absorbent screen is found to depend more critically on the absorptive properties of the screen than on the fluid flow. The radiated sound intensity, in the half space in which the source is located, can be considerably reduced by a suitable choice of the absorption parameter.

scholarly journals Current Development and Applications of Super-Resolution Ultrasound Imaging

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2417
Author(s):  
Qiyang Chen ◽  
Hyeju Song ◽  
Jaesok Yu ◽  
Kang Kim
Keyword(s):  
Kidney Disease ◽  
Ultrasound Imaging ◽  
Atherosclerotic Plaque ◽  
Super Resolution ◽  
Emerging Technology ◽  
Diffraction Limit ◽  
Disease Models ◽  
Current Development ◽  
Future Directions ◽  
Acoustic Diffraction

Abnormal changes of the microvasculature are reported to be key evidence of the development of several critical diseases, including cancer, progressive kidney disease, and atherosclerotic plaque. Super-resolution ultrasound imaging is an emerging technology that can identify the microvasculature noninvasively, with unprecedented spatial resolution beyond the acoustic diffraction limit. Therefore, it is a promising approach for diagnosing and monitoring the development of diseases. In this review, we introduce current super-resolution ultrasound imaging approaches and their preclinical applications on different animals and disease models. Future directions and challenges to overcome for clinical translations are also discussed.

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