Calculation of the field map from the measurement data of the fluxset sensor

The relation between the output of the fluxsel sensor and the magnetic fiel d is established by the numerical and experimental investigation of an ECT set-up. A fast calculation method has been developed for obtaining the magn etic field generated by the interaction of the probe and the crack in a fin ite plate by superimposing the results obtained by the analysis of a finite plate without a crack and an infinite plate with a crack. The calculations are made by FEM and boundary integral methods, respectively. The relations hip between the measured output and the magnetic field is obtained by calcu lating the calibration factors giving the best fit of the two sets of data. Based on the results, a numerical fool is developed for the quantitative e valuation of magnetic field sensors applied to the measurement of spatially inhomogeneous fields.