Sound fields focused by a biconcave acoustic lens for normal and oblique incidence

T. Nakamura, M. Hashimoto, K. Mori, T. Kamakura, T. Anada
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引用次数: 5

Abstract

In this report, a sound pressure field focused by a biconcave lens was investigated using the wave theory and the numerical methods of the parabolic equation (PE) method and finite difference time domain (FDTD) method for normal incidence. For oblique incidence, the hybrid method which combines ray theory and wave theory was used in the calculation. The experimental data were compared with the theoretical results shown above. The experimental on-axis characteristics around the focal point agreed well with the calculated results but disagreed with the results for in front and behind the focal region. It was found that the second peak existed behind the focal point for normal incidence, though there is no second peak in the theoretical results by the analytical method and the FDTD method. After the numerical analysis by the hybrid method and the PE method, the second peak was found at the same position as the experiment. This was thought to be caused by the influence of the edge of the lens, which has a finite size. The dependence of convergent characteristics for oblique incidence was also compared with the results by the hybrid method.
双凹面声透镜聚焦正常和斜入射声场
本文利用波动理论和抛物方程法(PE)法、时域有限差分法(FDTD)法对双凹透镜聚焦声压场进行了研究。对于斜入射,采用射线理论和波动理论相结合的混合方法进行计算。实验数据与理论结果进行了比较。焦点周围的轴向特性与计算结果吻合较好,而焦点前后的轴向特性与计算结果不一致。通过解析法和时域有限差分法得到的理论结果均不存在第二峰,但在正入射情况下,在焦点后存在第二峰。通过混合方法和PE方法的数值分析,发现第二峰位于与实验相同的位置。这被认为是由透镜边缘的影响造成的,透镜边缘的尺寸是有限的。并与混合方法的结果进行了比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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