论文标题
带有载体断层扫描的背景导向的Schlieren技术，用于测量激光诱导的水下冲击波的轴对称压力场
Background-oriented Schlieren technique with vector tomography for measurement of axisymmetric pressure fields of laser-induced underwater shock waves
论文作者
论文摘要
这项研究旨在克服基于计算机断层扫描（CT-BOS）面部的现有面向背景的Schlieren（BOS）技术的问题，当测量激光诱导的水下冲击波的压力场时。为此，它提出了一种基于轴对称靶标的矢量断层扫描（VT-BO）的新型BOS技术。所提出的技术的显着特征是重建具有非零差异的轴对称矢量场，例如激光诱导的水下冲击波的场。这种方法基于轴对称矢量场的投影与重建的向量场之间的近似关系。为了进行比较，通过VT-BOS，CT-BOS和针状水文测量了水下冲击波的压力场。发现在更好的收敛性，对获得的图像的空间分辨率和较低的计算成本方面，VT-BOS明显优于CT-BOS。所提出的技术不仅可以应用于流体动力学场，还可以应用于其他区域的其他轴对称靶标，例如电磁学和热力学。
This study aims to overcome the problems that existing background-oriented schlieren (BOS) techniques based on computed tomography (CT-BOS) face when measuring pressure fields of laser-induced underwater shock waves. To do this, it proposes a novel BOS technique based on vector tomography (VT-BOS) of an axisymmetric target. The remarkable feature of the proposed technique is the reconstruction of an axisymmetric vector field with nonzero divergence, such as the field of a laser-induced underwater shock wave. This approach is based on an approximate relation between the projection of the axisymmetric vector field and the reconstructed vector field. For comparison, the pressure fields of underwater shock waves are measured with VT-BOS, CT-BOS, and a needle hydrophone. It is found that VT-BOS is significantly better than CT-BOS in terms of better convergence, less dependence on the spatial resolution of the acquired images, and lower computational cost. The proposed technique can be applied not only to fluid dynamical fields, but also to other axisymmetric targets in other areas, such as electromagnetics and thermodynamics.
