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12 June 2023 Laser-spot lock-in thermography on thermal insulators: the coupling with the air as an opportunity to evaluate thermal diffusivity and conductivity
Adrián F. Bedoya, Félix Rodriguez-Valdés, Crescencio García-Segundo, Ernesto Marín, Agustín Salazar, Arantza Mendioroz
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Proceedings Volume 12536, Thermosense: Thermal Infrared Applications XLV; 125360Z (2023) https://doi.org/10.1117/12.2663329
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States
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Abstract
We present a model for laser-spot lock-in thermography that takes into account heat conduction between the sample and the air. We show that the effect of the coupling is only significant in low diffusivity materials. In this case, the dependence of the surface temperature distribution with both the conductivity and the diffusivity of the material provides a method to measure both properties simultaneously. We present experiments performed on several materials confirming that it is possible to determine both the thermal conductivity and diffusivity of thermal insulators with good precision and accuracy by laser-spot lock-in thermography.
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Adrián F. Bedoya, Félix Rodriguez-Valdés, Crescencio García-Segundo, Ernesto Marín, Agustín Salazar, and Arantza Mendioroz "Laser-spot lock-in thermography on thermal insulators: the coupling with the air as an opportunity to evaluate thermal diffusivity and conductivity", Proc. SPIE 12536, Thermosense: Thermal Infrared Applications XLV, 125360Z (12 June 2023); https://doi.org/10.1117/12.2663329
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KEYWORDS
Dielectrics
Thermography
Thermal modeling
Solid modeling
Interfaces
Solids
Statistical analysis
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