Generation of acoustical Bessel-like collimated beams using ring-excited flat plate structure transducers  

作　　者：Ming-Liang Han Ruo-Yu Tang Ning Ma Guang-Bin Zhang Xiao-Feng Zhang 韩明亮;唐若昱;马宁;张光斌;张小凤

机构地区：[1]Shaanxi Key Laboratory of Ultrasonics,College of Physics and Information Technology,Shaanxi Normal University,Xi’an 710119,China [2]College of Electronic Information and Optical Engineering,Nankai University,Tianjin 300071,China

出　　处：《Chinese Physics B》2025年第4期377-385,共9页中国物理B(英文版)

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.12474440).

摘　　要：This paper proposes a method to generate Bessel-like collimated beams with suppressed side lobes using the flexural vibration modes of a fixed boundary circular plate,which is excited by a longitudinally vibrating transducer in a ring excitation manner.The factors affecting the generation of Bessel-like collimated beams are investigated by theoretical analysis,numerical simulation and experimental methods.The results indicate that Bessel-like wave can be generated by a thin circular plate with fixed boundaries.The third-order mode of the circular plate can be modified to generate a collimated beam with suppressing side lobes when it is excited in a ring excitation manner and the excitation position lies between the first two nodal circles of the plate.As the excitation radius increases,the main lobe width of the resulting Bessel-like collimated beam decreases,the extent of the focusing region increases,and the amplitude of the side lobes initially increases and then decreases.Based on the simulation results,a prototype Bessel-like collimated beam generation system is made and measured experimentally.The experimental results are in good agreement with the numerical results.The Bessel-like collimated beam can be generated by the proposed system,which has potential application in the fields of long-range detection,imaging of highly attenuated materials,and airflow acceleration.

关 键 词：Bessel-like collimated beams flat plate structure transducers flexural vibration ring-excited 

分 类 号：O422.2[理学—声学]