Thermal and Mechanical Piston Influence on Photoacoustic Signal

Milica Dragaš; Vesna Miletić; Slobodanka Galović; Mioljub Nešić; Katarina Đorđević

doi:10.7251/IJEEC2302081D

Milica Dragaš University of East Sarajevo, Faculty of Philosophy
Vesna Miletić University of East Sarajevo, Faculty of Philosophy
Slobodanka Galović „VINČA” Institute of Nuclear Sciences, University of Belgrade
Mioljub Nešić „VINČA” Institute of Nuclear Sciences, University of Belgrade
Katarina Đorđević „VINČA” Institute of Nuclear Sciences, University of Belgrade

DOI: https://doi.org/10.7251/IJEEC2302081D

Keywords: photoacoustics, aluminum, thermodiffusion, thermoelasticity

Abstract

In this work, the influence of the thermal and mechanical piston effects over the frequency at which the amplitudes of the components of the photoacoustic signal resulting from these two effects are equalized. The analysis was done in the measuring range 10 to 20kHz. An aluminum sample illuminated with modulated light, whose thickness varies from 10 to 1000 microns, was considered.