| 平面波束二次谐波方向性分析 |
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| 引用本文： | 徐伟,王鸿樟,段世梅,寿文德,谢志行.平面波束二次谐波方向性分析[J].上海交通大学学报,2005,39(2):329-331. |
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| 作者姓名： | 徐伟 王鸿樟 段世梅 寿文德 谢志行 |
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| 作者单位： | 上海交通大学,生物医学工程系,上海,200030;上海交通大学,生物医学工程系,上海,200030;上海交通大学,生物医学工程系,上海,200030;上海交通大学,生物医学工程系,上海,200030;上海交通大学,生物医学工程系,上海,200030 |
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| 基金项目： | 国家自然科学基金资助项目(30000043) |
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| 摘 要： | 以Westervelt方程为理论基础，推导了平面波束二次谐波的声压和声强分布，得出平面波束的二次谐波的指向特性主要与波束的尺寸和波长的相对比值、波束的频率有关，高频时也会有旁瓣出现，但在所有频率范围以内都有较尖锐的指向特性。
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| 关 键 词： | 二次谐波 平面波束 指向特性 |
| 文章编号： | 1006-2467(2005)02-0329-03 |
| 修稿时间： | 2004年2月24日 |
Analysis of the Directional Characteristic of Second Harmonic of Collimated Beam of Sound |
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| XU Wei,WANG Hong-zhang,DUAN Shi-mei,SHOU Wen-de,XIE Zhi-xing.Analysis of the Directional Characteristic of Second Harmonic of Collimated Beam of Sound[J].Journal of Shanghai Jiaotong University,2005,39(2):329-331. |
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| Authors: | XU Wei WANG Hong-zhang DUAN Shi-mei SHOU Wen-de XIE Zhi-xing |
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| Abstract: | On the base of the Westervelt equation, this paper studied the acoustic field of the second harmonic of a collimated beam of sound, in particular the directional characteristics. It is concluded that the directional characteristics of the second harmonic is decided by its frequency and the ratio of the aperture of the transducer to the wavelength. The second harmonic has sharper directivity, although there are sidelobes along with the high frequency. |
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| Keywords: | second harmonic collimated beam of sound directional characteristic |
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