| 摘要 |
PURPOSE:To detect exactly the flaws in the corner part on an inside from an outside surface, by setting the position, oscillating angle and ungle of refraction of a probe from the angle between a beam of an optimum incident angle and the triaxial directions having the pole with the corner part of the inside surface. CONSTITUTION:A probe 23 is mounted movably and oscillatably in a tangential direction to a moving carriage 21 which travels while detecting swiveling angles along a cylinder 3. An arithmetic circuit 26 calculates the probe position from the swiveling angle of the carriage 21 and the extend of the movement in the tangential direction of the probe 23. A driving control circuit 27 compares the signal of the postion and oscillating angle of the probe and the incident angle of an ultrasonic beam with the angle (q) between the ultrasonic beam of an optimum incident angle and the axis y'' in parallel with the axis (y) of the body 1 of triaxial directions (X'', Y'', Z'') having the pole with a corner part C as well as the angle P between the beam projected on the plane running the two axes (X'', Z'') and the axis Z'' in parallel with the axis Z of the cylinder and outputs the driving signal for correcting the swiveling angle of the carriage 21 and the extent of movement and oscillating angle of the probe 23 and the incident angle of the beam. |
