物理学报2017，Vol.66Issue(15)：176-184,9.DOI:10.7498/aps.66.154302
基于热声相控阵列的声聚焦效应
Acoustic focusing by thermoacoustic phased array?
摘要
Abstract
Broadband acoustic focusing effect based on a thermoacoustic phased array is studied. In this work, according to the relationship between the sound velocity and the temperature, a new type of a thermoacoustic phase control unit is designed by using air with different temperatures surrounded by rigid insulated boundaries and thermal insulation films. The acoustic wave velocity could be adjusted by changing the temperature of air in the unit, and the transmitted and reflected acoustic phase delays can cover the whole 2π interval. On the basis of this thermoacoustic phased array, we design four different types of acoustic focusing lenses. By using eight or two kinds of such units, we realize the transmitted and reflected acoustic focusing effect, respectively. The results show that the thermoacoustic phased array lens has a good focusing performance in a frequency range of 4.0-15.0 kHz. In addition, the center intensity of the focal spot is much greater in the focusing lens with eight phase units, and the design method is simpler and more robust in the focusing lens with two phase units. Compared with other types of focusing lenses, the proposed focusing lens based on the thermoacoustic phased array has the advantages of broad bandwidth, high focusing performance and simple designed method. The results provide a theoretical basis and experimental reference for designing the broadband thermoacoustic phased array devices and new types of acoustic focusing lenses.关键词
声聚焦/热声/相位控制/温度Key words
acoustic focusing/thermoacoustic/phase manipulation/temperature引用本文复制引用
刘宸,孙宏祥,袁寿其,夏建平,钱姣..基于热声相控阵列的声聚焦效应[J].物理学报,2017,66(15):176-184,9.基金项目
国家自然科学基金(批准号:11404147)、国家自然科学基金重大项目(批准号:51239005)、江苏省自然科学基金(批准号:BK20140519)和江苏高校"青蓝工程"资助的课题. Project supported by the National Natural Science Foundation of China(Grant No. 11404147), the Major Program of the National Natural Science Foundation of China(Grant No. 51239005), the Natural Science Foundation of Jiangsu Province of China(Grant No. BK20140519), and the Jiangsu Qing Lan Project, China. （批准号:11404147）
