Nondestructive inspection device

特許 権利維持 PROBLEM TO BE SOLVED: To detect two kinds of cracks in the axial direction and in the circumferential direction. ; SOLUTION: In Fig. (a), a potential difference measuring terminal 112 for a defect in the circumferential direction is installed on a terminal holder 122, and a potential difference measuring terminal 114 for a defect in the axial direction is installed on a terminal holder 124. The potential difference measuring terminal 112 for the defect in the circumferential direction and the potential difference measuring terminal 114 for the defect in the axial direction are installed so that each direction of the two terminals forms 90[deg.] mutually.