| 摘要 |
PURPOSE:To perform position detection with high precision and to perform flaw inspection with high precision by transmitting and cutting off the rays of light from a light transmitting and receiving means provided to one ultrasonic flaw inspection probe by the end part of a member prolonged from the other ultrasonic probe. CONSTITUTION:Multiple probes 6c and 7c are arranged on the surface 3 opposite each other across the collar 2 of a turbine disk and shifted in position from P1 Pn and the probes 6c1 and 7c1 are excited at the position P1 to send an ultrasonic beam. The center value 0 of two echo distributions generated by a key groove edge is set at an origin. Beams are made incident from positions S1 and S2 to detect a defective end part echo and beam path lengths l1 and l2 are measured to calculate the coordinates of a defect tip, and the probes are moved from a position T1 Tn in the reflection direction and pieces of information l1' and l2' are obtained to calculate the position of the defect tip, spotting an intersection of each measurement point as the tip position of the defect. In this case, light emitting element groups 6j and 7k and photodetecting element groups 6k and 7l on the front surfaces of the probes detect the movement extents of the probes, which are held on the same axis by utilizing variation in the received quantity of light when the jig of one probe passes in the sensor on the other probe, thereby performing high-precision flaw detection.
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