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<p>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.</p>

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Photoacoustic Signal of Optically Opaque Two-Layer Samples: Influence of Anomalous Thermal Diffusion

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • A. Somer,
  • M. N. Popovic,
  • G. K. da Cruz,
  • A. Novatski,
  • E. K. Lenzi,
  • K. Djordjevic,
  • S. Galovic

摘要

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.