FLAW DETECTOR AND FLAW DETECTION IN PIPE USING THEREOF

摘要

PURPOSE:To transmit ultrasonic wave into a place located in designated depth with a designated projection angle and a transmission angle by probe vibrators formed in spherical shape. CONSTITUTION:The vibrator 8 of a projecting probe 6 and another vibrator 8 of a receiving probe 7 are respectively set at the projecting pont A of the former and the transmitted point B from the pipe 1 so that vibrating face from each bibrator 8, can form spherical shape or empty semione being nearly to the shape around each setting A, B. Basing a depth l of a point to be flaw-detected and a distance L between both probes 6 and 7, the projecting point A and transmitted point B are determined initially and, then the centers of vibraters O are re-positioned so that the projecting point A and transmitted point B may be directed to the center Pa of the pipe 1. Thereby ultrasonic wave having designated projecting angle theta can be projected at the designated projecting point A, and ultrasonic wave can be transmitted through a place of the designated depth l. Then the sent signal can be received with the designated transmission angle theta'. In the case of varying the depth of flaw-detection required. It is realized only by varying the relation deistance between the both probes 6 and 7, thereby flaw-detection of any depth can be operated.