Influence of Local Thermodynamic Non-Equilibrium to Photothermally Induced Acoustic Response of Complex Systems

Slobodanka P. Galovic; Aleksa Djordjevic; Bojan Kovacevic; Katarina Djordjevic; Dalibor Chevizovich

doi:10.20944/preprints202405.1105.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Version 1 : Received: 15 May 2024 / Approved: 16 May 2024 / Online: 16 May 2024 (12:18:07 CEST)

In this paper, the time-resolved model of 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.

heat transfer; irreversibility; local non-equilibrium; time delayed equation; fractional calculus; subdiffusion; Mittag-Leffler function; time-domain photoacoustic

Physical Sciences, Condensed Matter Physics

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Influence of Local Thermodynamic Non-Equilibrium to Photothermally Induced Acoustic Response of Complex Systems

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