| 摘要 |
PROBLEM TO BE SOLVED: To reduce noise in a long range by arranging a shield board preventing surface reflection waves reflected by a dimple in a round rod material surface from reaching an angle probe on the front face of the angle probe and fitting a holder holding the shield board in the upper part of a removable shoe. SOLUTION: On the front face of an angle probe 28, a shield board 40 preventing surface reflection waves reflected by a dimple in a detected flaw material 10 from reaching the angle probe 28 is arranged. The shield board 40 is fitted in the upper part of a shoe 32 with its both ends held by a holder. The tip of the shield board 40 is covered by means of an Si rubber. A pair of oscillators 29 in the angle probe 28 are arranged while putting a vertical probe 20 between them, and ten sets of these pairs, for example, are arranged in the longitudinal direction of the detected flaw material 10. |
