Aiming at the problem that there is defect detection blind zone near the surface of aluminum sheet when using ultrasonic testing technology

application of eddy-current detection in blind zone testing is studied.Based on COMSOL

probe and testing model for shallow burial defect are built.Influences of inner diameter

turns

and excitation frequency variation on detection sensitivity of probe are respectively studied.Probe and test platform are designed

and aluminum-plate test piece with buried defects of different depths are test.The experimental results show that the method can effectively test the aluminum-plate buried defects with maximum depth of 3.0 mm and minimum width of 0.1 mm.And shallow surface defect detection blind zone of ultrasonic testing（surface blind zone of ultrasonic defect detection） can be effectively covered.This method is expected to be combined with ultrasonic technology to achieve rapid detection of aluminum-plate surface and shallow surface defects.