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

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Title: Photoacoustic Signal of Optically Opaque Two-Layer Samples: Influence of Anomalous Thermal Diffusion.
Authors: Somer, A.1 (AUTHOR) aloisisomer@gmail.com, Popovic, M. N.2 (AUTHOR), da Cruz, G. K.1 (AUTHOR), Novatski, A.1 (AUTHOR), Lenzi, E. K.3 (AUTHOR), Djordjevic, K.4 (AUTHOR), Galovic, S.4 (AUTHOR)
Source: International Journal of Thermophysics. Jun2025, Vol. 46 Issue 6, p1-20. 20p.
Subjects: Temperature distribution, Heat equation, Cell size, Thermophoresis, Pistons
Abstract: 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. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Thermophysics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Photoacoustic Signal of Optically Opaque Two-Layer Samples: Influence of Anomalous Thermal Diffusion.
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Thermophysics%22">International Journal of Thermophysics</searchLink>. Jun2025, Vol. 46 Issue 6, p1-20. 20p.
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  Data: <searchLink fieldCode="DE" term="%22Temperature+distribution%22">Temperature distribution</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+equation%22">Heat equation</searchLink><br /><searchLink fieldCode="DE" term="%22Cell+size%22">Cell size</searchLink><br /><searchLink fieldCode="DE" term="%22Thermophoresis%22">Thermophoresis</searchLink><br /><searchLink fieldCode="DE" term="%22Pistons%22">Pistons</searchLink>
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  Data: 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. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of International Journal of Thermophysics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10765-025-03554-0
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      – SubjectFull: Heat equation
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      – SubjectFull: Cell size
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              Text: Jun2025
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