A new theoretical approach to photoacoustic signal generation
A new theoretical approach to photoacoustic signal generation
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DOI：
10.1121/1.427087
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发表时间：
1999-08-01
影响因子：
2.4
通讯作者：
de Mul, FFM
中科院分区：
文献类型：
--
作者：
Hoelen, CGA;de Mul, FFM
从光声信号产生的各种机制出发，详细讨论了水介质中局部热膨胀引起的光声信号产生机制。这种机制也被称为热弹性PA信号生成。本文提出了一种新的球面波场分布的物理解释，并由此推导出其它源的几何形状和时间分布所产生的信号。讨论了一些基本的和实际的源的几何形状的特征PA信号轮廓。讨论了由于粘滞和热弹性损耗引起的PA信号衰减和变形。本文给出了球面高斯时空光声放大源产生瞬态的解析结果。实验PA信号示出了几个几何形状和源直径。(C)1999年美国声学学会。【S0001-4966（99）00208-8】。
From the various mechanisms of photoacoustic (PA) signal generation, the one due to local thermal expansion in aqueous media is treated here in detail. This mechanism is also referred to as thermoelastic PA signal generation. A new physical explanation of the spherical PA profile is presented, from which the signals generated by other source geometries and temporal profiles can be deduced. The characteristic PA signal profiles are discussed for some fundamental and practical source geometries. Also the PA signal attenuation and deformation due to viscous and thermoelastic losses is discussed. The analytic result for the transient generated by a spherical Gaussian spatiotemporal PA source is presented. Experimental PA signals are shown for several geometries and source diameters. (C) 1999 Acoustical Society of America. [S0001-4966(99)00208-8].