| 摘要 |
PURPOSE:To detect the flaw in columnar matter from the outer surface thereof with high sensitivity, by contacting a film like probe with the columnar matter having a curved surface and processed into a stepped form so as to follow the surface of said matter. CONSTITUTION:A film like probe 1 is attached to the bottom surface of a probe case A and a flexible backing material 2 is bonded to the back surface thereof to attach a cable 3. The surface, which is contacted with the surface of columnar matter B, of the side plate of the probe case A is processed so as to have radius of curvature same to that of the surface of the columnar matter B. The probe case A is contacted with the surface of the columnar matter B and an ultrasonic wave is emitted so as to allow the film like probe 1 to follow the surface of the columnar matter B by a press screw 6 and a contact plate 7. At this time, the flexible backing material 3 attenuates energy propagating behind the film like probe 1. Therefore, by preparing only one probe and the probe case having specific radius of curvature, the vicinity of an axial core can be subjected to flaw detection even with respect to an object to be inspected having a stepped curved surface such as a turbine shaft with high sensitivity and high resolving power. |
