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Optoacoustic effect analysis by FEM

Abstract:

The optoacoustic effect is simulated in ANSYS software to illustrate the interaction of a pulsed source of light with a structure, where part of the absorbed energy is converted into thermal energy producing a small temperature variation in the sample, which varies with the same frequency that makes radiation incident, which simultaneously generates acoustic waves that can be detected. This optoacoustic effect produced by the interaction of a pulsed laser (wavelength λ = 1064 nm, pulse duration τp = 10 ns, initial energy E0 = 20 μJ), with a morphological structure with water properties is analyzed by Finite Elements Method (FEM) and the contributes mechanisms (temperature, pressure, intensity) of the transduction light into acoustic waves are quantified. In this context, this simulation presents an easy way to understand, research and develop mechanism to study the optoacoustic effect, currently considered as a potential and powerful non-invasive technic for biomedical applications and also widely proposed as spectrometry alternative method, specially to analyze the optical properties of biological elements (hemoglobin, fat, and others), nanoparticle tracking in cancer diagnostic and treatment technics, and broadly used as an emergent tomography technic. Finally, we perform a comparison between the theoretical data and in-silico tests.