Simulation Analysis of Eddy Current Testing Parameters for Surface and Subsurface Defect Detection of Aviation Aluminum Alloy Plate

Table 4

Influence of excitation frequency on defect detection.

Frequency range (kHz)	Step (kHz)	Depth of defect (mm)		(mm)	(mm)
		Surface defects	Subsurface defects
10~1000	10	1, 2, 3, and 4	1, 2, 3, and 4	3	1.5