用非线性声透镜产生声子弹
Generation of Sound Bullets with a Nonlinear Acoustic Lens
摘要：
声透镜被用于从生物医学成像和外科手术到防御系统的各种应用中，但其性能受到其线性操作包络和复杂性的限制。在这里，我们展示了一个戏剧性的聚焦效果，并在固体和流体介质中产生大振幅，紧凑的声脉冲（声音子弹），使一个可调的，高度非线性的声透镜。该透镜由有序的颗粒链阵列组成。声音子弹的振幅、大小和位置可以通过改变链上的静态预压缩来控制。我们支持我们的研究结果与理论，数值模拟，并证实实验结果与光弹性测量。我们的非线性透镜使产生高能声脉冲的新方法成为可能，例如，使外科手术控制声能成为可能。
英文摘要：
Acoustic lenses are employed in a variety of applications, from biomedical imaging and surgery, to defense systems, but their performance is limited by their linear operational envelope and complexity. Here we show a dramatic focusing effect and the generation of large amplitude, compact acoustic pulses (sound bullets) in solid and fluid media, enabled by a tunable, highly nonlinear acoustic lens. The lens consists of ordered arrays of granular chains. The amplitude, size and location of the sound bullets can be controlled by varying static pre-compression on the chains. We support our findings with theory, numerical simulations, and corroborate the results experimentally with photoelasticity measurements. Our nonlinear lens makes possible a qualitatively new way of generating high-energy acoustic pulses, enabling, for example, surgical control of acoustic energy.
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