Mutual inductance between coil units is usually regarded as interference factors to influence accuracy of receiving / launching array eddy current sensor

many kinds of methods are used to decrease the impact of mutual inductance between coil units on testing coil unit in engineering practice

but defect informations are contained in mutual inductance between coil units

more defect informations are obtained through effectively using mutual inductance between coil units

which is advantageous for defect assessmennt. The influences of coil unit related parameters on testing sensitivity and spatial resolution of array eddy current sensor are studied through effectively using mutual inductance between coil units with 3D finite element simulation based on ANSYS software

and reference is provided for the optimal design of array eddy current sensor based on mutual inductance between coil units.