Thermal conductivity measurements play a crucial role in most areas of the applied physical sciences, thereby constantly demanding for new non-invasive methods capable of providing high-resolution spatial mapping of absolute thermal conductivities on heterogeneous samples ranging from solid-state bulk materials to low-dimensionality structures. In this work, we lay the theoretical foundations and provide the experimental demonstration of a novel method for quantitative thermal conductivity mapping at tunable ∼10-μm resolution, by non-contact infrared photo-activated thermography. Starting from Fourier's heat transfer law, we surmise a universal dependence of the thermal response of a laser-irradiated sample on its thermal conductivity, irrespectively of density and specific heat capacity. We demonstrate such a dependence over the three conductivity decades 0.1–100 W/mK by finite-element numerical simulations, and exploit it for proof-of-principle single-point thermal conductivity measurements on both thermally thick and thermally thin reference solid samples. We exemplify the feasibility of space-resolved measurements on eighteenth-century tin organ pipe fragments, where the product of the thermal conductivity times the sample thickness, imaged at 40-μm sub-diffraction resolution, is pointed out as a relevant parameter for the non-destructive characterization of the sample conservation state. By coupling temperature maps with the extraction of thermal properties at high spatial resolution, our approach significantly expands the capability of state-of-the-art infrared imaging technology in fully capturing the compositional heterogeneity and/or functional state of the imaged materials.

Marini, M., Bouzin, M., Sironi, L., D'Alfonso, L., Colombo, R., Di Martino, D., et al. (2021). A novel method for spatially-resolved thermal conductivity measurement by super-resolution photo-activated infrared imaging. MATERIALS TODAY PHYSICS, 18 [10.1016/j.mtphys.2021.100375].

A novel method for spatially-resolved thermal conductivity measurement by super-resolution photo-activated infrared imaging

Marini M.;Bouzin M.;Sironi L.;D'Alfonso L.;Colombo R.;Di Martino D.;Gorini G.;Collini M.;Chirico G.
2021

Abstract

Thermal conductivity measurements play a crucial role in most areas of the applied physical sciences, thereby constantly demanding for new non-invasive methods capable of providing high-resolution spatial mapping of absolute thermal conductivities on heterogeneous samples ranging from solid-state bulk materials to low-dimensionality structures. In this work, we lay the theoretical foundations and provide the experimental demonstration of a novel method for quantitative thermal conductivity mapping at tunable ∼10-μm resolution, by non-contact infrared photo-activated thermography. Starting from Fourier's heat transfer law, we surmise a universal dependence of the thermal response of a laser-irradiated sample on its thermal conductivity, irrespectively of density and specific heat capacity. We demonstrate such a dependence over the three conductivity decades 0.1–100 W/mK by finite-element numerical simulations, and exploit it for proof-of-principle single-point thermal conductivity measurements on both thermally thick and thermally thin reference solid samples. We exemplify the feasibility of space-resolved measurements on eighteenth-century tin organ pipe fragments, where the product of the thermal conductivity times the sample thickness, imaged at 40-μm sub-diffraction resolution, is pointed out as a relevant parameter for the non-destructive characterization of the sample conservation state. By coupling temperature maps with the extraction of thermal properties at high spatial resolution, our approach significantly expands the capability of state-of-the-art infrared imaging technology in fully capturing the compositional heterogeneity and/or functional state of the imaged materials.
Articolo in rivista - Articolo scientifico
Heat transfer; Infrared thermography; Super-resolution imaging; Thermal conductivity; Thermal properties;
English
4-mar-2021
2021
18
100375
reserved
Marini, M., Bouzin, M., Sironi, L., D'Alfonso, L., Colombo, R., Di Martino, D., et al. (2021). A novel method for spatially-resolved thermal conductivity measurement by super-resolution photo-activated infrared imaging. MATERIALS TODAY PHYSICS, 18 [10.1016/j.mtphys.2021.100375].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/314361
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