美国宾夕法尼亚州立大学的学者提出一种超常材料制成的声透镜设计方案,可以通过调整折射率控制声束。这是一个类似于照相机镜头的装置,能够实现声波对焦,采用不同的人工结构模块,可以放大或缩小通过透镜的平面波束宽度。科学家希望这种透镜能在医疗超声成像、无损检测、表面波传感器等应用领域发挥作用。 Scholars from Pennsylvania State University in the United States put forward an acoustic lens design made of metamaterials that can control the sound beam by adjusting the refractive index. This is a camera-like device that enables acoustic focusing with a variety of artificial structures to magnify or reduce the planar beamwidth across the lens. Scientists hope this lens can play a role in medical ultrasound imaging, non-destructive testing, surface wave sensors and other applications.