Study on ACFM Crack Angle Detection with 1-D Array Probe

For the development of ACFM intelligent and visualization inspection system, based on a large number of finite element simulation results about ACFM crack angle detection, the calculate method of ACFM crack direction by 1-D array probe is present, and the experimental test is designed and conducted with the real crack. Test results show that, when tested by the 1-D probe composed of 4 couples of detecting coils, the accuracy of crack angle is more than 80%, which can meet the engineering needs, and the ACFM crack angle detection method is effective. Moreover, compared with the simulation analysis results, it is easy to know the calculation accuracy of the angle detection can be further improved by increasing detection coils or decreasing distance between two coils.