Measurement of the thermal diffusivity of thin films by an AC joule-heating method

Abstract

A new thermal analysis named TWA (Temperature Wave Analysis) is proposed. This technique is based on the AC joule-heating method developed in our laboratory, and makes it possible to obtain thermal diffusivity precisely as a function of temperature at a constant frequency. The theoretical background and the calculation procedure for this technique are reported. This technique was applied to the study of the first order transition of high density polyethylene and the glass transition of glycerin.