COMPARISON OF MODEL AND EXPERIMENTAL CHARACTERISTICS OF FIELD BETWEEN SPHERIC POLE PIECES AT FARADAY BALANCE

Abstract

Experimental coordinate characteristics of magnetic field induction and its gradient are obtained between pole pieces of Faraday balance electromagnetic system. Pole pieces have spheric form that is preferable by possibility of obtaining area with a stable gradient as a working area for specimen’s positioning. Alternative characteristics which are obtained by modeling at the program COMSOL Multiphysics are shown using the same values of supply current and distance between pole pieces as at the experiment. It is shown that together with qualitative commonality of model and experimental characteristics difference of its data at the working area are up to 11 % (by induction), 24 % (by gradient), hereby testify about probable error of conclusive result which is up to 35 %, and up to 5 % by coordinate of gradient extremum. Questions about determining correction factor are discussed (normalizing factor for model characteristic); at its proved value equals 0,86 (e.g. at starting exclude of 14 % «systematic» error, probably obtained at the case of using results after modeling) a differences of mentioned data are up to 4, 5, 5% accordingly.