Simple simultaneous measurement of thermal diffusivity and thermal conductivity using application of inverse solution for one dimensional heat conduction

A previous procedure to measure thermal diffusivity and thermal conductivity simultaneously using an inverse solution for one-dimensional unsteady heat conduction can be simplified by improving the inverse solution with moving window clearing the issue related to settlement of time left in previous one. The new procedure does not need any time when the temperature change starts at a sensor position and can simply choose a time duration during which the measured temperature change becomes larger than the required accurate temperature change. The measurement is usually completed within about 1 minute until the temperature rise at the thermocouple position reaches a certain temperature level which makes its error level lower than a couple of percents. This method has merit being independent of surface condition except for the requirement of two or three sensing positions in the material. The accuracy of the estimated values is also similar to the error level of sensor at the position.