Implementation of new methods for non-destructing testing of diffusion coefficient in porous material products

Abstract

Abstract New methods for non-destructive testing of diffusion coefficient in thin-sheet and massive products made of isotropic and anisotropic porous materials are considered. In contrast to the rigid structure in the known methods, the represented methods are more flexible in implementing measurement procedures due to higher accuracy of measuring the desired coefficient. Flexibility is provided by calculating experimental data in the preferred sections and by choosing there the static characteristic of the transducer with a stable and noise-proof output signal and in the ranges with high sensitivity to changes in parameters. Expressions for calculating the desired diffusion coefficient for each test subject and a generalized sequence of measurement procedures are introduced. The modified version of the information and measurement system for implementing the proposed methods is described, and the results of the research are presented.