INFRARED CAMERA PROCESSING WITH INTEGRAL TRANSFORM - MEASUREMENT OF THERMAL-DIFFUSIVITY OF ANISOTROPIC MATERIALS BY FLASH METHOD

Methods devoted to the measurement of thermal diffusivity of anisotrop ic samples are usually based on ponctual thermocouple sensing. In this case, the geometrical form of the heat flux excitation has to be perf ectly known. The use of infrared camera is here proposed. Then, the tr ansient evolution of the temperature field on the front or rear face o f the sample, after excitation, is recorded. The use of space variable Fourier Transform of the temperature field leads to a simple analytic al identification of the radial diffusivity. This identification does not depend on the geometrical form of the excitation. The considerable number of data produced by the camera is processed using a statistica l approach. Experimental results are presented.