A Study of the Multisensor Estimation Method Based on Fusion Technology for Subsurface Defect Depth

Table 1

The evaluation results of the surface material defect depth using three methods.

Number	The real defect depth	Echo arrival time feature (ms) of ultrasonic testing	Amplitude feature (V) of eddy current testing	The depth of UT	The depth of ECT	The depth of multisensor testing
1	4.5	21.48	0.578	4.49	3.05	4.49
2	4	21.09	0.574	4.36	3.13	4.36
3	3.5	20.56	0.583	4.13	2.72	3.75
4	3	19.88	0.587	3.69	2.49	3.17
5	2.5	19.21	0.593	3.27	2.22	2.64
6	2	18.43	0.601	2.99	1.81	1.86
7	1.5	18.27	0.607	2.68	1.44	1.44
8	1	18.08	0.612	2.53	1.04	1.04