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Facta universitatis - series: Electronics and Energetics 2023 Volume 36, Issue 4, Pages: 485-497
https://doi.org/10.2298/FUEE2304485S
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Electro-acoustic analogies between thermoelastic component of the photoacoustic signal and low-pass RC filter

Stanojević Neda Lj. ORCID iD icon (Faculty of Electronic Engineering, University of Niš, Niš, Serbia), neda.stanojevic@elfak.ni.ac.rs
Markushev Dragana K. ORCID iD icon (Institute of Physics, University of Belgrade, Belgrade-Zemun, Serbia)
Aleksić Sanja M. ORCID iD icon (Faculty of Electronic Engineering, University of Niš, Niš, Serbia)
Pantić Dragan S. ORCID iD icon (Faculty of Electronic Engineering, University of Niš, Niš, Serbia)
Lukić Dragan V. ORCID iD icon (Institute of Physics, University of Belgrade, Belgrade-Zemun, Serbia)
Popović Marica N. (Institute of Physics, University of Belgrade, Belgrade-Zemun, Serbia)
Markushev Dragan D. ORCID iD icon (Institute of Physics, University of Belgrade, Belgrade-Zemun, Serbia)

This paper presents a new approach to the thermal characterization of aluminum, based on the electro-acoustic analogy between the thermoelastic component of the photoacoustic signal and the passive RC low-pass filter. The analogies were used to calculate the characteristic thermoelastic cut-off frequencies of the photoacoustic component and obtain their relationship with the thickness of the aluminum samples. Detailed numerical analysis showed that the required relationship is linear in the loglog scale and can serve as a reference curve for the given material. The results of the numerical analysis were also confirmed experimentally.

Keywords: electro-acoustic, thermoelastic component, photoacoustic signal, RC filter


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