Image Acoustics, Inc, 97 Elm Street, Cohasset, Massachusetts 02025, USA.
J Acoust Soc Am. 2011 Apr;129(4):1881-9. doi: 10.1121/1.3559684.
The superposition of acoustical modes radiated from a transducer can provide directionality from a compact projector. This paper presents the foundation, as well as examples, of piezoelectric ceramic, piezoelectric single crystal, and magnetostrictive versions of this "modal projector." Measured and analytical, as well as finite element analysis modeled, results show good agreement and establish this transducer as a viable source of intensity with the advantages of an improved directivity index, reducing the power needed from a compact source.
声模态的叠加可使紧凑的换能器具有指向性。本文介绍了这种“模态发射器”的压电陶瓷、压电单晶和磁致伸缩版本的基础原理和实例。测量和分析以及有限元分析模型的结果表明，它们具有良好的一致性，并证明了这种换能器作为一种可行的强度源具有改进的指向性指数的优势，可减少来自紧凑源的所需功率。
