Development of an algorithm to extract thermal diffusivity for the radial converging wave technique

Thermal Diffusivity Measurement of Oxide Scale Formed on Steel during Hot-rolling Process

“…The effect of atmosphere gas in a flash measurement results in heat loss, which can be observed in the measured temperature change. The thermal diffusivity determination in non-adiabatic condition has been discussed, 19,31,32) which would be applied to future measurements. Furthermore, along with the thermal diffusivity and conductivity measurements of oxide scales under the simulated conditions of the practical process, the structure of oxide scales also have to be observed, since database of the thermal diffusivity and conductivity of oxide scales including the structural model will enable the thermal properties to be predicted in the future.…”

A Simplified Low Cost Converging Thermal Wave Technique for Measuring Thermal Diffusivity of Thin Foils

“…This explained that the theoretical curve of fitting can be slightly improved (for better starting point which close to the early of the rising part) by using higher thermal diffusivity sample. In order to successfully fit between the theoretical model and the experimental data, the heat pulse duration and the width of the ring must be minimized to the optimum condition by using ultrashort pulse width [5,7,9] and a few tens of micrometers of 'ring' [12] respectively. However we expected heat loss will rather quickly dominated in the sample compared to the present work.…”

“…CTW can be applied for a small specimen of solids if the diameter of the specimen is two times larger than that of the heat source ring [12]. Along with the CTW technique, a simple algorithm has been developed by Murphy et al [7] to treat heat loss parameter in the analytical solution of the CTW technique.…”

An On-Line Method for Thermal Diffusivity Detection of Thin Films Using Infrared Video

“…Altogether 120 infrared images (240 × 320) have been recorded immediately after the heat excitation within the time range of 0 < t < 2 s. From the recorded infrared images, the temperature evolutions of 76800 (240 × 320) positions T0 1 1(t) ~ T0 240 320(t) on the sample surface could then be extracted using (10).…”