Root Joseph A, Rogers Peter H
G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta 30332, USA.
J Acoust Soc Am. 2002 Nov;112(5 Pt 1):1869-78. doi: 10.1121/1.1509073.
Time reversal permits acoustic focusing and beam forming in inhomogeneous and/or high-scattering environments. A volumetric array geometry can suppress back lobes and can fit a large, powerful array of elements into small spaces, like the free-water spaces on submarines. This research investigates applying the time-reversal method to an underwater acoustic volume array. The experiments evaluate the focusing performance of a 27-element volume array when different scattering structures are present within the volume of the array. The array is arranged in a 3x3x3 cubic matrix configuration with 18.75-cm vertical and horizontal element spacing. The system utilizes second-derivative Gaussian pulses to focus on a point 30 cm from the array. Results include a comparison between time-reversal focusing and standard focusing, an evaluation of the volume array's ability to suppress back lobes, and an analysis of how different scattering environments affect focal region size. Potential underwater applications for a volume array using time reversal include acoustic imaging, naval mine hunting, sonar, and underwater communications.
时间反转允许在非均匀和/或高散射环境中进行声学聚焦和波束形成。体积阵列几何结构可以抑制旁瓣，并且能够将大量强大的换能器元件安装在小空间内，比如潜艇上的自由水空间。本研究探讨将时间反转方法应用于水下声学体积阵列。实验评估了一个27元体积阵列在阵列体积内存在不同散射结构时的聚焦性能。该阵列按3×3×3立方矩阵配置排列，垂直和水平方向的换能器元件间距均为18.75厘米。该系统利用二阶导数高斯脉冲聚焦于距阵列30厘米处的一个点。结果包括时间反转聚焦与标准聚焦之间的比较、对体积阵列抑制旁瓣能力的评估，以及对不同散射环境如何影响焦区大小的分析。使用时间反转的体积阵列在水下的潜在应用包括声学成像、猎雷、声纳和水下通信。
