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Abstract

Acoustic focusing effect with broad bandwidth based on the temperature gradient distribution is studied. The propagation paths of the acoustic waves can be controlled by the temperature gradient distribution generated by two heat sources, which is adopted to realize the acoustic focusing effect. This focusing effect arises from the continuous change of the acoustic refractive index induced by the change of temperature, and has no reflection energy loss. Therefore, the acoustic focusing effect has the advantages of broad bandwidth and high focusing performance. In addition, we have investigated the influences of the factors (incident frequency, temperature of heat source, spatial distribution of interface, position of heat source, attenuation coefficient of the medium, and asymmetric distribution of heat source temperature) on the acoustic focusing effect in detail, and verified the feasibility of the acoustic focusing system by using aerogel based on temperature gradient distribution in single medium.

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Authors and contacts

Corresponding author:Sun Hong-Xiang,jsdxshx@ujs.edu.cn;Shouqiy@ujs.edu.cn; Yuan Shou-Qi,jsdxshx@ujs.edu.cn;Shouqiy@ujs.edu.cn;

Funds:Project supported by the Major Program of the National Natural Science Foundation of China (Grant No. 51239005), the National Natural Science Foundation of China (Grant No. 11404147), the Natural Science Foundation of Jiangsu Province of China (Grant No. BK20140519), the China Postdoctoral Science Foundation (Grant No. 2015M571672), the Research Fund for Advanced Talents of Jiangsu University, China (Grant No. 13JDG106), the Training Project of Young Backbone Teachers of Jiangsu University, and the Practice Innovation Training Program Projects for Jiangsu College Students, China (Grant No. 201510299047Y) and for Industrial Center of Jiangsu University.

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Vol. 65, Issue 4 - 2016-02-20

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Corresponding author:Sun Hong-Xiang,jsdxshx@ujs.edu.cn;Shouqiy@ujs.edu.cn; Yuan Shou-Qi,jsdxshx@ujs.edu.cn;Shouqiy@ujs.edu.cn;

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Corresponding author:Sun Hong-Xiang,jsdxshx@ujs.edu.cn;Shouqiy@ujs.edu.cn; Yuan Shou-Qi,jsdxshx@ujs.edu.cn;Shouqiy@ujs.edu.cn;

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