Abstract

The main idea of this scientific article is tomography usage. Projections of multidimensional signal carrying the information about the spatial structure of objects' thermal physic properties are represented by thermal tomograms obtained in active mode of test material surface heating by infrared radiation.

Processing of a thermal tomogram is produced by solving the inverse thermal conductivity problem. This solution applies to cuboids of infrared images reduction class of problems. Because of reduction, we get the distribution image of thermal conductivity identified values on isotropic material surface (thermal tomogram) allowing revealing foreign inclusions in the heterogeneous object structure based on the contrast over thermal conductivity. Implementation of this idea is associated with certain difficulties due to the necessity of mathematical modeling of nonlinear thermal transients.

The paper presents quartz sand thermal tomograms with temperature conductivity of 9 10-7 m2 s and thermal conductivity of -1 0.9 W m-1 K-1 which structure contains thermal insulation material - expanded foam, and thermally conductive material - aluminum.

 

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