局部热力学非平衡对复杂系统光热诱导声学响应的影响

S. Galović, Aleksa I. Djordjevic, Bojan Z. Kovacevic, K. Djordjevic, Dalibor Chevizovich
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引用次数: 0

摘要

本文推导了具有复杂内部结构的样品的光声信号时间分辨模型,包括具有多个自由度的结构元素的局部非平衡,即系统的结构熵。局部非平衡是通过分数算子来考虑的。通过对极短脉冲和极长脉冲这两种随时间变化的激励进行分析,可以看出复杂样品中的非平衡弛豫率可以通过应用推导出的模型和时域测量进行测量。文中还讨论了该模型的局限性及其进一步的发展方向。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of Local Thermodynamic Non-Equilibrium to Photothermally Induced Acoustic Response of Complex Systems
In this paper, the time-resolved model of the photoacoustic signal for samples with a complex inner structure is derived including local non-equilibrium of structural elements with multiple degrees of freedom, i.e., structural entropy of the system. The local non-equilibrium is taken into account through the fractional operator. By analyzing the model for two types of time-dependent excitation, a very short pulse and a very long pulse, it is shown that the rates of non-equilibrium relaxations in complex samples can be measured by applying the derived model and time-domain measurements. Limitations of the model and further directions of its development are discussed.
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