Analysis of boundary conditions and transient signal treatment in diffusivity measurements by laser pulse method

2014 A laser pulse method for diffusivity determination is analysed. The method which permits the measurement of the laser pulse energy distribution as well as its shape is developed. This method can be easily implanted into laser pulse diffusivity set-up and it allows to check periodically the pulse characteristics that is of primary importance for the accuracy of the diffusivity measurements. The corrections to the classical model of Parker et al. [1] due to the heat losses and finite pulse duration are then discussed The improvement of the accuracy of the diffusivity measurement through the use of a digitalized data acquisition system (DDAS) is proposed. The smoothing technique of the expérimental, transient thermal signal is developed on the basis of a digitalized Fourier transform. Finally the diffusivity set-up is presented and some results for the standard materials are shown. Tome 20 No 1 JANVIER 1985 Revue Phys. Appl. 20 (1985) -11 JANVIER 1985, PAGE 1