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- W1996202089 abstract "A theoretical model is presented for computing the transient acoustical field radiated by a baffled transducer in a lossless or absorbing medium. Attenuation is introduced by the addition of a term to the wave equation, simulating the absorption of biological tissue. The method is based on a time generalization of the angular spectrum theory. It shows that diffraction of the pulse is equivalent to the time-varying spatial filter that reduces the high spatial frequency components. The effect of attenuation is to enhance the low-frequency components even more than in the lossless case, while exponentially attenuating the wave amplitude. The method is valid for any planar velocity souce distribution with arbitrary time excitation. Neither the Fresnel nor the Fraunhofer approximations are used, consequently no restrictions on the propagation distance are required. The effects of a finite receiver are easily incorporated in the formulation as an additional spatial filter. Computer simulations of results both with and without attenuation are included." @default.
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- W1996202089 date "1984-05-01" @default.
- W1996202089 modified "2023-09-24" @default.
- W1996202089 title "Diffraction of pulsed ultrasonic waves in lossless and absorbing media" @default.
- W1996202089 doi "https://doi.org/10.1121/1.2021475" @default.
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