New approach to data analysis in modified Angstrom's method

The conditions required for the accurate measurement of the thermal diffusivity of solids by the modified Angstrom's method are studied. Authors know that this method is suitable for determination of the thermal diffusivity of thick samples with low thermal diffusivity and it is difficult to determine thermal diffusivity of relatively thin samples of good thermal conductors. Up till now thermal properties of the transitional layers - layers between the thermocouple and the sample - were not taken into account in data analysis. It is shown that thermal resistances of the intermediate layers and noises should be taken into account in analysis of measured signals. Based on that new methodology for analysis of experimental data is proposed.