Improving the accuracy and speed of non-destructive testing of the diffusion coefficient in thin products made of anisotropic porous materials

Method of the diffusion coefficient non-destructive testing in thin products made of anisotropic porous materials is the subject of this work. The method makes it possible to obtain the required results in the absence of the applied diffusant converter real static characteristic in the solid phase. The effective flexibility application conditions in terms of the possibility for using different sections of the response curve to pulse diffusant dose exposure is analyzed. The aim of the research is to optimize the method in terms of accuracy and speed. Methods of mathematical metrology and error theory were used to solve this problem. The influence on the accuracy and speed of the non-destructive testing method of the ratios of the maxima of the output characteristic of the Emax concentration converter observed in experiments and the values of the output characteristic E_cal, at which the time points included in the calculated ratios are fixed, is analyzed. A natural decrease in the errors in fixing the time points included in the calculated ratios and a decrease in the performance of the non-destructive testing method with an increase in the difference (E_max – E_cal) are proved. The problem of multiparametric Pareto optimization has been solved in the presence of two irreducible criteria: minimum error and minimum duration of the diffusion coefficient measurement process. The results of the efficiency of the nondestructive testing method for determining the diffusion coefficient are presented, taking into account the optimal values of the parameters found in comparison with the initial data.

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