A. Somer, M. N. Popovic, G. K. da Cruz, A. Novatski, E. K. Lenzi, K. Djordjevic, S. Galovic
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Photoacoustic Signal of Optically Opaque Two-Layer Samples: Influence of Anomalous Thermal Diffusion
This study analyzes the impact of anomalous diffusive heat equations (GCE) on the photoacoustic (PA) signal of the optically opaque two-layer sample measured in the gas-microphone configuration with minimum volume cell. We calculated the temperature distribution in the sample based on classical, hyperbolic, and two generalized fractional theories of heat propagation, including anomalous diffusion effects. Using the composite piston model, we derived the models of both the thermoelastic (TE) and thermodiffusion (TD) components as well as the total PA signal. In the analyses, we used opaque aluminum samples with an opaque dye coating. The results indicate that even small changes in fractional order of coating significantly affect the PA response of analyzed structure.
期刊介绍：
International Journal of Thermophysics serves as an international medium for the publication of papers in thermophysics, assisting both generators and users of thermophysical properties data. This distinguished journal publishes both experimental and theoretical papers on thermophysical properties of matter in the liquid, gaseous, and solid states (including soft matter, biofluids, and nano- and bio-materials), on instrumentation and techniques leading to their measurement, and on computer studies of model and related systems. Studies in all ranges of temperature, pressure, wavelength, and other relevant variables are included.
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