Fast calculation of pulsed photoacoustic fields in fluids using k-space methods
Fast calculation of pulsed photoacoustic fields in fluids using k-space methods
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DOI：
10.1121/1.1920227
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发表时间：
2005-06-01
影响因子：
2.4
通讯作者：
Beard, PC
中科院分区：
文献类型：
--
作者：
Cox, BT;Beard, PC
两个相关的数值模型，计算时间依赖的压力场的任意光声源在流体中辐射，如产生的吸收的短激光脉冲，提出。频率-波数（k空间）实现已被用于产生快速和准确的预测。模型I计算任何时刻的场，并且对于可视化波场的三维演化是有用的。模型11计算直线或平面上点的压力时间序列，因此可用于模拟阵列测量。通过将垂直波数谱直接映射到频率，该模型可以比当前光声传播的数值模型快50倍地计算时间序列。由于场的传播部分和倏逝部分是分别计算的，因此模型11可用于计算远场和近场辐射图案。此外，它可以很容易地适用于计算速度势，从而粒子速度和声强度矢量。这两种模型都利用了快速傅里叶变换的效率，并且可以直接包括声检测器的频率相关的方向响应。通过与已知的解析解和速度较慢但易于理解的数值模型进行比较，验证了该模型。(c)2005年美国声学学会。
Two related numerical models that calculate the time-dependent pressure field radiated by an arbitrary photoacoustic source in a fluid, such as that generated by the absorption of a short laser pulse, are presented. Frequency-wavenumber (k-space) implementations have been used to produce fast and accurate predictions. Model I calculates the field everywhere at any instant of time, and is useful for visualizing the three-dimensional evolution of the wave field. Model 11 calculates pressure time series for points on a straight line or plane and is therefore useful for simulating array measurements. By mapping the vertical wavenumber spectrum directly to frequency, this model can calculate time series up to 50 times faster than current numerical models of photoacoustic propagation. As the propagating and evanescent parts of the field are calculated separately, model 11 can be used to calculate far- and near-field radiation patterns. Also, it can readily be adapted to calculate the velocity potential and thus particle velocity and acoustic intensity vectors. Both models exploit the efficiency of the fast Fourier transform, and can include the frequency-dependent directional response of an acoustic detector straightforwardly. The models were verified by comparison with a known analytic solution and a slower, but well-understood; numerical model. (c) 2005 Acoustical Society of America.