The latest advancements are presented about a new method to quantify the thermal diffusivity, devised for on-site measurements of solids accessible from one side only.A periodic thermal input is supplied to the inspected solid by a thermoelectric device based on the Peltier effect, which can alternate heating and cooling stages and quickly produce a steady-periodic temperature field within the solid, with null net heat input. The diffusivity of the material is then estimated by monitoring the propagation of the temperature cycles along the accessible surface of the solid, adjacent to the thermal input area. A portable camera for infrared thermography is used for non-intrusive surface temperature measurement.Mathematical and experimental methods are utilised to identify the conditions for which a 1D heat transfer model can be used to accurately represent the actual 3D temperature field. At the present stage, the attention is focused onto obtaining the adherence of the test system to the theoretical model. Ease of operation and portability of the equipment are also pursued.
On-site measurement of thermal diffusivity by infrared thermography and thermoelectric equipment / Muscio, Alberto; F., Gavelli; Tartarini, Paolo. - STAMPA. - I:(2000), pp. 85-96. (Intervento presentato al convegno XVIII Congresso Nazionale sulla Trasmissione del Calore tenutosi a Cernobbio (CO), Italia nel 28-30 giugno 2000).