衍射超声透镜

Diffractive ultrasonic lens

以基尔霍夫衍射理论和菲涅尔波带片理论为原理,设计制作了一个衍射超声透镜,实验达到声波聚焦放大效果,理论模拟准确预言实验结果.改变透镜的物距D和透镜环数N对比声场,发现后者是影响一维声场分布的主要因素.

Based on Kirchhoff diffraction theory and Fresnel zone-plate theory,an ultrasonic lens is designedand produced. This lens successfully focused acoustic wave in the experiments,while simulations preciselydescribed experiments results. When the distance between lens and source （ D）or number of lens rings （ N）ischanged,the 1D acoustic distribution illustrated that the later is a more magnificent variance.