Nonlinear Effects in Laser Flash Thermal Diffusivity Measurements

The numerical solution of the nonlinear heat conduction equation is used to analyze nonlinear effects in the laser flash method, when the thermophysical parameters of the sample depend on the temperature. A parameter estimation technique is proposed to determine the temperature dependence of the thermal diffusivity from a response curve. Computer generated data, as well as real experimental data, were used to demonstrate the reliability of the technique