Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
1998-05-18
Physics
Condensed Matter
Soft Condensed Matter
21 pages, 8 ps figures, accepted for publication in European Physical Journal B
Scientific paper
10.1007/s100510050375
The scattering of ultrasound from bubbles of micrometer-sized radius, such as used in contrast enhancers for ultrasound diagnostics, is studied. We show that sound scattering and ``active'' emission of sound from oscillating bubbles are not contradictory, but are just two different aspects derived from the same physics. Treating the bubble as a nonlinear oscillator, we arrive at general formulas for scattering and absorption cross sections. We show that several well-known formulas are recovered in the linear limit of this ansatz. In the case of strongly nonlinear oscillations, however, the cross sections can be larger than those for linear response by several orders of magnitude. The major part of the incident sound energy is then converted into emitted sound, unlike what happens in the linear case, where the absorption cross sections exceed the scattering cross sections.
Hilgenfeldt Sascha
Lohse Detlef
Zomack Michael
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