用阴影法观察水声模型的声场

我们建立了一套用于显示模拟海底反射声场的光学系统。实验水声模型是由水-玻璃粉-玻璃-铝组成的三层模拟海底结构，声源是一个管状换能器，其轴线平行于分界面。实验用这套系统记录了从水下三个界面反射的六组波的声场图像。并且分辨出了它们各自的传播路径。从声场图像也可以得出水-玻璃粉界面、玻璃粉-玻璃界面的面波声速，玻璃粉和玻璃中的体波声速以及它们的厚度，结果与预先测出的参数符合。

Visualization of the acoustic field of seabed model by a shadowgraph

An optical system for the visualization of the acoustic waves reflected from the seabed model was constructed. The laboratory seabed model consists of water-glass bead-glass -aluminum. The acoustic source is a cylindrical transducer with its axis paralleled to the interfaces. The six groups of waves in water, which are reflected from the three interfaces under the Water, were recorded by Shadowgraph mode and their travelling paths were distinguished. The velocities of the surface waves on the water-glass bead interface and the glass bead-glass interface, the thickness and the velocities of the bulk waves in glass bead and glass were derived. These parameters are agrees to our previous measurements.