| 摘要 |
PURPOSE:To improve reliability of inspection by subjecting a tubular object to be inspected to flaw detection in the axial and circumferential directions thereof by using a probe provided with a coil for detection provided on a core coaxial with the central axis of said object and the other coil for detection deviating from the central axis of the object. CONSTITUTION:A probe 1 is formed of a detecting coil 3 wound concentrically with the central axis of an object 2 to be detected, the other detecting coil 5 having the central axis prependicular to the central axis of the object 2 and a common core 7 and is connected via lead wires 4 and 6 to an outside AC power source. When AC current is passed to the coils 3 and 5, eddy current flows in the object 2 owing to an induction effect and the eddy current changes according to the presence or absence of a defect existing in the object to be detected and therefore the change in said current is detected by the coils 3 and 5. The position of the defect existing in the object to be inspected is thus detected by scanning the probe 1 in the axial and circumferential directions respectively. |
