Nonlinear parametric sound enhancement through different fluid layer and its application to noninvasive measurement
Nonlinear parametric sound enhancement through different fluid layer and its application to noninvasive measurement
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DOI：
10.1016/j.measurement.2016.09.004
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发表时间：
2016-12
期刊：
影响因子：
5.6
通讯作者：
K. Fujisawa;A. Asada
中科院分区：
文献类型：
--
作者：
K. Fujisawa;A. Asada
本文从理论和实验两方面研究了参数阵列对水中不同流体层次波的增强作用。利用Burgers方程对非线性声音在水中流体层中的传播进行了理论分析，并研究了二次波的增强比。结果表明，在5种流体层中，由于乙醇的非线性流体性质和液/水界面，水中乙醇层对信号振幅的增强比最高。为了验证理论结果，在水中使用乙醇层进行了实验。结果表明，由于乙醇层的存在，二次波的增强比增加了3倍以上，而在远场中则逐渐减小。将不同流体层的概念与阴影成像技术相结合，应用于水中目标方柱体的无创测量。结果表明，利用乙醇层对水中目标结构的尺寸测量精度优于传统的非线性成像方法。
This paper presents a theoretical and experimental study on the enhancement of secondary waves generated from a parametric array through different fluid layers in water. A theoretical analysis was carried out using the Burgers equation for nonlinear sound propagation through a fluid layer in water, and the enhancement ratio of secondary waves was studied. The result indicated that among the five types of fluid layers studied, the ethanol layer in water had the highest enhancement ratio for signal amplitudes because of nonlinear fluid properties of ethanol and the fluid/water interface. To confirm the theoretical result, experiments were carried out using an ethanol layer in water. The result indicated that the enhancement ratio of secondary waves increased by more than three times because of the ethanol layer and decreased gradually in the far field in water. The concept of different fluid layers combined with a shadow imaging technique was applied to the noninvasive measurement of a target square cylinder in water. It was found that the accuracy of the size measurement of the target structure in water using an ethanol layer was better than that of conventional nonlinear imaging.