【作者】 宋忠长； 张宇； 王先艳； 魏翀；

【Author】 SONG Zhong-chang;ZHANG Yu;WANG Xian-yan;WEI Chong;Key Laboratory of Underwater Acoustic Communication and Marine Information Technology (Xiamen University) Ministry of Education;Laboratory of Marine Biology and Ecology, Third Institute of Oceanography, State Oceanic Administration;

【机构】 厦门大学水声通信与海洋信息技术教育部重点实验室； 国家海洋局第三海洋研究所；

【摘要】 本文通过CT扫描实验,获得了东亚江豚头部内部的细微结构,并通过切片实验测量了该江豚前额区域不同位置组织的声速和密度值。并对获取得到的组织切片的CT扫描结果亨氏单位Hounsfield Unit(HU)与切片对应的声速、密度进行冋归分析,结果显示声速、密度与HU值之间具有显著线性关系,并由此重建该江豚头部的声速、密度分布。并根据CT扫描结果构建了该江豚的头部二维模型,将重建得到的声速、密度分布用于二维模型中,利用有限元方法研究了该江豚的声波波束特点与额隆在波束形成过程中起到的调控作用。更多还原

【Abstract】 In this paper, the internal head structure of a narrow-ridge finless porpoise(Neophocaena asiaeorientalis sunameri) was obtained through CT scanning. The forehead tissues were sectioned into several pieces. Their sound velocities and densities were measured. The relationships between tissue’s scanning number, Hounsfield Unit(HU), and the corresponding sound velocities, HU and density, were analyzed through regression method to reconstruct the forehead sound velocity and density distributions. A two dimension head model was obtained and used through finite element method to research the beam properties of the porpoise and the melon’s modulation role in beam formation was also investigated.更多还原