Flaw Localization Estimation of Ultrasonic Circumferential Testing of Cylindrical Surface

It is needed to localize the flaw position for echos over the gate on ultrasonic circumferential testing. Under the prerequisite of location error less than 1 mm, the flaws at second wave position was transferred into the flaw at initial echo position. The simplification formula based on flat flaw localization was researched, which can increase the detection efficiency and control the error.