Aberration reduction of acoustic lens for ultrasonic underwater imaging sonar

点击翻译按钮获取中文摘要

In this research, an aplanatic acoustic lens which can nearly completely reduce a spherical aberration and a coma aberration for the sound ray which enters in parallel in the paraxial area was designed by the ray tracing method used for the design of optical lenses. Then, the convergence characteristics of the designed aplanatic acoustic lens were evaluated by a numerical calculation method. Next, an aplanatic lens and an aplanatic Fresnel lens which aimed at the weight reducing and low attenuation were made, and the superior convergence characteristics were proved in water tank experiments.