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

Table 1

Measurements of the magnetic induction $B$ (in Tesla) at 12 points on the surface of the strip for several values of the imposed current and for a defect with $\alpha =-0.001$ m and $\beta =0.01\hspace{0.17em}$m.

Needle sensor	$I_{\text{set}}\hspace{0.17em}(\text{A})$
position (mm)	0.5	1	1.5	2	2.5	3
$-$34	0.92	1.24	1.33	1.41	1.45	1.49
$-$24	0.89	1.16	1.13	1.3	1.35	1.39
$-$14	0.89	1.19	1.22	1.31	1.35	1.35
$-$4	0.93	1.28	1.35	1.38	1.4	1.46
3.5	0.98	1.45	1.63	1.68	1.72	1.76
6	1.03	1.38	1.45	1.53	1.56	1.59
8.5	0.99	1.41	1.5	1.56	1.62	1.65
11	1.04	1.35	1.44	1.49	1.55	1.58
13.5	0.92	1.27	1.38	1.42	1.48	1.54
16	0.79	1.18	1.32	1.35	1.4	1.51
26	0.8	1.18	1.25	1.3	1.41	1.44
36	0.81	1.17	1.17	1.24	1.42	1.36