宽带水声参量阵指向性设计与实验验证  

Directivity design and experimental verification of underwater broadband acoustic parametric array

作　　者：张富东[1] 周代英[1] 陈敏[2] 肖越[1] 

机构地区：[1]电子科技大学电子工程学院,成都610054 [2]电子科技大学空天科学技术研究院,成都610054

出　　处：《声学技术》2011年第2期140-143,共4页Technical Acoustics

基　　金：国家自然科学基金项目(60901062;60302001)

摘　　要：利用宽带水声参量阵可产生高指向性宽带低频声束,推导了宽带水声参量阵生成低频声束的自解调理论模型,对其换能器指向性进行了分析与设计,并研制出了宽带水声参量阵样机。测试结果表明:该样机产成的2 kHz声束的-3 dB指向性锐角约为2.6°,具有很好的指向性,且旁瓣抑制效果好,能够产生无旁瓣的高指向性低频声束。这为解决浅海水声通信的多途干扰、远程水声保密通信等问题提供了一条新思路。The underwater broadband acoustic parametric array can produce a broadband audio beam at low frequencies with high directivity.In this paper,its theoretical self-demodulation model of generating an audio beam at low frequency is deduced firstly.Then,the directivity of its transducer is analyzed and designed,and prototype is also fabricated.The experimental result shows that the prototype can generate an audio beam at 2 kHz with excellent directivity performance,whose directivity acute angle at -3 dB is about 2.6°.Moreover,the prototype can produced an audio beam at low frequency without sidelobes due to its excellent performance in suppressing sidelobe,which is significant for solving the problems such as the multipath interference of the shallow-water communication and the long distance underwater secret communication.

关 键 词：宽带水声参量阵 低频声束 旁瓣抑制 

分 类 号：TB556[理学—物理]