Finite-element analysis of material and parameter effects in laser-based thermoelastic ultrasound generation.
Finite-element analysis of material and parameter effects in laser-based thermoelastic ultrasound generation.
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基于激光的热弹性超声发生中材料和参数效应的有限元分析。
DOI：
10.1109/tuffc.2004.1334851
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
Hossack,JohnA
中科院分区：
文献类型：
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作者：
Zhou,Shiwei;Reynolds,Paul;Krause,Roland;Buma,Takashi;O'Donnell,Matthew;Hossack,JohnA
基于激光的热弹性传导方法在极高频率 (>50 MHz)、高密度二维 (2-D) 阵列方面具有潜力，可用于各种极高分辨率表面成像应用，包括体内组织切片。以前对这些换能器的研究通常基于使用各种简化假设的实验测量或理论分析。这些理论模型大多是一维的，并且最适合具有最少数量的组件材料的简单几何形状。在这项工作中，我们在商用有限元分析 (FEA) 软件包中使用新的热弹性求解器来分析任意几何形状的基于激光的设备中的多维效应，并有可能用于任意材料属性。首先根据实验数据验证有限元分析方法。此后，我们探讨了各种设计变量的影响，包括激光光斑尺寸和激光穿透深度。
Laser-based, thermoelastic transduction methods have potential in very high frequency (>50 MHz), high-density two-dimensional (2-D) arrays for a variety of very high-resolution superficial imaging applications, including in vivo tissue sectioning. Previous studies of these transducers generally have been based on experimental measurements or theoretical analyses using various simplifying assumptions. These theoretical models are mostly 1-D and best matched to simple geometries with a minimum number of component materials. In this work, we use a new thermoelastic solver in a commercially available finite-element analysis (FEA) software package to analyze multidimensional effects in laser-based devices of arbitrary geometry with the potential for use with arbitrary material properties. The FEA approach was verified first against experimental data. Thereafter, we explored the impact of various design variables, including laser spot size and laser penetration depth.