Analysis of a Nondestructive Evaluation Technique for Defect Characterization in Magnetic Materials Using Local Magnetic Measurements

Table 3

Results of the inverse problem for discrete simulated measurement data obtained from a sample with air gap $\alpha =(\mathrm{0,0.01})\hspace{0.17em}$m. Both methods converge to a local optimum close to the exact solution.

	Small perturbations			Sensitivity
$I_{\text{set}}$ (A)	${\alpha }_{\min \hspace{0.17em}}$ (m)	${\beta }_{\min \hspace{0.17em}}$ (m)	$F_{\min \hspace{0.17em}}$	${\alpha }_{\min \hspace{0.17em}}$ (m)	${\beta }_{\min \hspace{0.17em}}$ (m)	$F_{\min \hspace{0.17em}}$
3.0	0.001571	0.008445	1.49e-06	0.001574	0.008457	1.49e-06
2.5	0.001579	0.008433	1.53e-06	0.001495	0.008537	1.53e-06
2.0	0.001436	0.008563	1.57e-06	0.001356	0.008663	1.58e-06
1.5	0.001202	0.008790	1.61e-06	0.001162	0.008838	1.61e-06
1.0	0.000945	0.009031	1.60e-06	0.000934	0.009032	1.60e-06
0.5	0.000560	0.009434	1.51e-06	0.000568	0.009417	1.51e-06