Due to the single direction incentive mode is mostly used in eddy current defect detection and defects direction in real detection is unknown

resulting in detection sensitivity is uncertain.Aiming at this case

adetecting probe with rectangular coil exciting based on GMR is designed

and rectangular defects are selected as research target.Through the qualitative quantitative simulation and comparison variation of magnetic induction intensity under the same incentive direction and defects in different directions

the defect direction parallel to axis of exciting coil can reflect defect better.On this basis

scanning experiment is carried out in different directions

scanning curves of test data are compared

it suggests that the defects parallel to the axis of the exciting coil has higher peak value and more significant peak position

which is more applicable to reflect defect information.