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Fractal Fract, Vol. 8, Pages 399: Influence of Local Thermodynamic Non-Equilibrium to Photothermally Induced Acoustic Response of Complex Systems
Fractal and Fractional doi: 10.3390/fractalfract8070399
Authors: Slobodanka Galovic Aleksa I. Djordjevic Bojan Z. Kovacevic Katarina Lj. Djordjevic Dalibor Chevizovich
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.
