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热疗用环形平面换能器声场特性的研究 被引量:7
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作者 钱盛友 《应用声学》 CSCD 北大核心 2003年第3期11-16,共6页
引入负声源,导出了环形平面换能器声场的简洁表示式,计算了单个圆环、多个同心圆环同时激励及环阵相控聚焦声源产生的声场,分析了环的宽度、环数及聚焦点位置等因素对声场特征的影响。提出根据各阵元在声场中某点产生的声压的相位来确... 引入负声源,导出了环形平面换能器声场的简洁表示式,计算了单个圆环、多个同心圆环同时激励及环阵相控聚焦声源产生的声场,分析了环的宽度、环数及聚焦点位置等因素对声场特征的影响。提出根据各阵元在声场中某点产生的声压的相位来确定各阵元电激励信号的延时,此方法较根据各阵元到该点的平均声程确定各阵元电激励信号的延时,能更准确地在该点实现聚焦。 展开更多
关键词 超声热疗 治疗 肿瘤 环形平面换能器 声场特性 聚焦超声 环形相控阵列
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Modeling of Focused Acoustic Field of a Concave Multi-annular Phased Array Using Spheroidal Beam Equation
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作者 余立立 寿文德 惠春 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第2期285-289,共5页
A theoretical model of focused acoustic field for a multi-annular phased array on concave spherical surface is proposed. In this model, the source boundary conditions of the spheroidal beam equation (SBE) for multi-... A theoretical model of focused acoustic field for a multi-annular phased array on concave spherical surface is proposed. In this model, the source boundary conditions of the spheroidal beam equation (SBE) for multi-annular phased elements are studied. Acoustic field calculated by the dynamic focusing model of SBE is compared with numerical results of the O'Neil and Khokhlov-Zabolotskaya-Kuznetsov (KZK) model, respectively. Axia/dynamic focusing and the harmonic effects are presented. The results demonstrate that the dynamic focusing model of SBE is good valid for a concave multi-annular phased array with a large aperture angle in the linear or nonlinear field. 展开更多
关键词 axial dynamic focusing SBE acoustic field multi-annular phased array
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