Performance Bounds on Atmospheric Acoustic Sensor Arrays Operating in a Turbulent Medium. 1. Plane-Wave Analysis

2002 ◽  
Author(s):  
Sandra L. Collier ◽  
D. K. Wilson
Keyword(s):  
Plane Wave ◽  
Sensor Arrays ◽  
Turbulent Medium ◽  
Acoustic Sensor ◽  
Performance Bounds ◽  
Wave Analysis

Green's function of the Lord–Shulman thermo-poroelasticity theory

2020 ◽  
Vol 221 (3) ◽  
pp. 1765-1776 ◽  
Author(s):  
Jia Wei ◽  
Li-Yun Fu ◽  
Zhi-Wei Wang ◽  
Jing Ba ◽  
José M Carcione
Keyword(s):  
Plane Wave ◽  
Green’S Function ◽  
Green's Function ◽  
Heterogeneous Media ◽  
Numerical Algorithms ◽  
Heat Diffusion ◽  
P Wave ◽  
Wave Analysis ◽  
S Wave ◽  
S Waves

SUMMARY The Lord–Shulman thermoelasticity theory combined with Biot equations of poroelasticity, describes wave dissipation due to fluid and heat flow. This theory avoids an unphysical behaviour of the thermoelastic waves present in the classical theory based on a parabolic heat equation, that is infinite velocity. A plane-wave analysis predicts four propagation modes: the classical P and S waves and two slow waves, namely, the Biot and thermal modes. We obtain the frequency-domain Green's function in homogeneous media as the displacements-temperature solution of the thermo-poroelasticity equations. The numerical examples validate the presence of the wave modes predicted by the plane-wave analysis. The S wave is not affected by heat diffusion, whereas the P wave shows an anelastic behaviour, and the slow modes present a diffusive behaviour depending on the viscosity, frequency and thermoelasticity properties. In heterogeneous media, the P wave undergoes mesoscopic attenuation through energy conversion to the slow modes. The Green's function is useful to study the physics in thermoelastic media and test numerical algorithms.

Capabilities study of airborne acoustic sensor arrays

2007 ◽  
Author(s):  
Wayne E. Prather ◽  
David H. Bridges ◽  
Tom Edwards ◽  
David S. Thompson
Keyword(s):  
Sensor Arrays ◽  
Acoustic Sensor
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