Abstract

The nonlinear pressure profile at the focus of an ultrasonic beam radiated into water at a frequency of 2.0 MHz and having a shock front with amplitude of 50 MPa is reconstructed for the first time using Raman lidar signals. This is possible due to the relationship between the degree of deformation of the O–H stretching vibration band in the Raman spectrum of water, the amplitude of elastic scattering, and the pressure at the sounding site. The lidar profile is in good agreement with a PVDF hydrophone profile.

中文翻译：

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使用拉曼激光雷达信号重建水中超声波束的非线性压力分布

摘要

首次使用拉曼激光雷达信号重建了以 2.0 MHz 频率辐射到水中并具有 50 MPa 振幅激波前沿的超声波束焦点处的非线性压力分布。这是可能的，因为水的拉曼光谱中 O-H 伸缩振动带的变形程度、弹性散射幅度和测深位置的压力之间存在关系。激光雷达轮廓与 PVDF 水听器轮廓非常吻合。