| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method and apparatus capable of reducing the noise caused by a longitudinal wave in an ultrasonic flaw detection system enabling transversal wave obliquie angle flaw detection without using a wedge. SOLUTION: In a system for controlling the transmission/reception timings (6T, 6R) and transmission/reception intensities (7, 8) of a plurality of perpendicular longitudinal wave vibrators for transmission/reception arranged on the surface of an object 13 to be inspected in an array form to control the time lag and intensity of the vertical stress applied to a flaw detection contact surface and enabling transversal wave oblique angle flaw detection without using the wedge, the arranging interval of the respective vibration elements are set and either one or both of the transmission time lag (6T) and reception time lag (6R) between the vibration elements are controlled so as to minimize the synthetic wave of output which is obtained by receiving the vertical stress based on the ultrasonic longitudinal wave reflected from the interior of the object 13 to be inspected by a plurality of the perpendicular longitudinal wave vibrators 10.</p> |
