Journal
MATERIALS TODAY PHYSICS
Volume 18, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mtphys.2021.100375
Keywords
Thermal properties; Thermal conductivity; Infrared thermography; Super-resolution imaging; Heat transfer
Funding
- Universita degli Studi di Milano-Bicocca [2018-ATE-0070, 2019-ATE-0126]
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Thermal conductivity measurements are crucial in the applied physical sciences, requiring new non-invasive methods for high-resolution spatial mapping. A novel method for quantitative thermal conductivity mapping at around 10 μm resolution was proposed and experimentally demonstrated in this work.
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 similar to 10-mu m 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-mm 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. (C) 2021 Elsevier Ltd. All rights reserved.
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