A Parameter Estimation Procedure in Thermal Diffusivity Measurements Using the Laser Flash Method

Paper presents the application of Gauss estimation procedure in measuring thermal diffusivity of single materials using the laser pulse method. Unlike procedures, based on that originally established by Parker et al., where thermal diffusivity is derived using one or more characteristic points of experimental signal, this one belongs to socalled inverse technique, which makes use of complete measured signal. Paper describes a method that achieves a minimum deviation between estimated and experimental curves and gives results with the highest possible accuracy, comprising at the same time uncertainties of known parameters. Also, an influence of new parameter, which represents the onset of temperature response, and its estimation, is studied and performed.