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ACOUSTIC METAMATERIAL DESIGN AND APPLICATIONS BY …
considering the acoustic impedance é ? of aluminum is around eleven times of that of water. A more careful analysis including elasticity of the solid suggested that at low frequency the majority of acoustic energy can be predominantly confined in the fluid, when such an excitation
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Ultrasound Imaging System - University of California, Los ...
www.ccn.ucla.eduReflection and transmission ! Acoustic impedance : Z=ρc ! ρ: density, c : sound velocity Z 1 Z 2 θ i θ r θ t Incident wave Reflected wave Transmitted wave 2 1 sin sin c c t i = θ Snell’s law θ R p= Z 2cosθ i−Z 1cosθ t Z 2cosθ i+Z 1cosθ t T p= 2Z 2cosθ i Z 2cosθ i+Z 1cosθ t For sound pressure R p: reflectance, T p ...
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www.fast.u-psud.frThis means that perfect matching (total transmission and zero reflection) can be achieved even between widely different impedances if a quarter-wavelength matching layer of ZZZo = 12 acoustic impedance is applied at the interface. Let us denote the center frequency where the layer thickness equals to one quarter-wavelength by fo. In the ...
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courses.washington.edu•Particle velocity v(x, y, z, t) •Acoustic pressure p(x, y, z, t), which is zero if there is no wave For longitudinal waves, it is straightforward to relate the acoustic pressure to the underlying particle velocity where Z = ρc is called the characteristic impedance –This is a like V=IR –Note that p=vZ v!c •Speed of sound for ...