Petrovska I. Increasing of accuracy and speed of electric conductivity distribution measurement by a tomography method.

The thesis is dedicated to the development of the methods of specific electric conductivity reproducibility accuracy and speed increasing within tomography measuring systems. Experimental research as well as numerical modeling by the method of terminable and concentrated elements of multielement objects for different distribution models are conducted. Measurement accuracy increasing by means of additive measurement error decreasing due to the usage of a difference measurement method; reproducibility speed increasing by means of the elaboration of sensitivity matrix calculation new methods without methodical errors and based only on a direct task single solution; the assurance of steadiness and coincidence of the iteration procedure of specific conductivity spatial distribution determinating by means of regularization parameter adapting are proposed. Transducers that consist of discrete, triangle and quadrangle terminable elements are investigated by the proposed new method. The characteristics of a (specific) conductivity reproducibility relative error in case of different models as well as the characteristics of mutual resistance absolute and relative errors are explored.