Proceedings ArticleDOI
Thermal diffusivity estimation of templated nanocomposite using frequency modulated infrared imaging
Lalat Indu Giri,Suneet Tuli +1 more
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TLDR
In this paper, the authors measured the thermal diffusivity of anodic alumina (AAO) and bismuth telluride nanowires using frequency modulated thermal wave imaging (FMTWI).Abstract:
Thermal diffusivity of anodic alumina (AAO) templated bismuth telluride nanowires has been measured using recently proposed frequency modulated thermal wave imaging (FMTWI). The technique provides a fast and efficient non-contact approach for in-plane thermal characterization of nanomaterials. An intensity modulated up-chirp signal is applied as photothermal excitation and the thermal response is monitored using an infrared (IR) thermography based temperature sensing system. Thermal diffusivity of the sample is experimentally assessed using the multiple phase information extracted from a single run of the experiment. This feature considerably reduces the operational time of the experiment as compared to similar lock-in thermography based approaches. This unique approach of solely using the phase information for thermal diffusivity measurements, allows the experiment to be more immune to the local variations in surface temperature and emissivity of the radiating surface. The experimental details of the technique are discussed, with practical measurement of thermal diffusivity of Bi2Te3/AAO nanocomposite in direction perpendicular to the nanochannel axis.read more
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TL;DR: In this paper, a classic account describes the known exact solutions of problems of heat flow, with detailed discussion of all the most important boundary value problems, including boundary value maximization.
Journal ArticleDOI
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TL;DR: In this paper, a high-intensity short-duration light pulse is absorbed in the front surface of a thermally insulated specimen, and the resulting temperature history of the rear surface is measured by a thermocouple and recorded with an oscilloscope and camera.
Journal ArticleDOI
Theory of frequency modulated thermal wave imaging for nondestructive subsurface defect detection
Ravibabu Mulaveesala,Suneet Tuli +1 more
TL;DR: In this paper, the authors provided the theory and mathematical analysis in support of a recently proposed frequency modulated thermal wave imaging for nondestructive subsurface defect detection in solids.
Journal ArticleDOI
On thermal diffusivity
TL;DR: In this article, the meaning of thermal diffusivity in homogeneous materials and composite materials is clarified, and it is shown that sometimes the association of two good thermal diffusers gives a bad diffuser.
Journal ArticleDOI
Quantitative thermal imaging by synchronous thermoreflectance with optimized illumination wavelengths
TL;DR: In this paper, the photothermal response of an integrated circuit working at frequencies between 0.1 Hz and 5 MHz was measured and explained using a thermocouple. But the authors did not consider the effect of a passivation layer.