Ultrasonic beam focusing characteristics of shear-vertical waves for contact-type linear phased array in solid

• 来源期刊: 中国物理B（英文版）
• 关键词: beam focusing shear-vertical (SV) waves contact-type linear phased array solid
• 年，卷（期）: 2020,（3）
• 页码范围: 308-315
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/ab69ed

摘要

We investigate the beam focusing technology of shear-vertical (SV) waves for a contact-type linear phased array to overcome the shortcomings of conventional wedge transducer arrays. The numerical simulation reveals the transient exci-tation and propagation characteristics of SV waves. It is found that the element size plays an important role in determining the transient radiation directivity of SV waves. The transient beam focusing characteristics of SV waves for various array parameters are deeply studied. It is particularly interesting to see that smaller element width will provide the focused beam of SV waves with higher quality, while larger element width may result in erratic fl uctuation of focusing energy around the focal point. There exists a specific range of inter-element spacing for optimum focusing performance. Moreover, good beam focusing performance of SV waves can be achieved only at high steering angles.