| 摘要 |
PURPOSE:To accurately remove a reflected echo from the end parts of a material to be inspected by constituting a surface echo detection system and a defect echo detection system independently and detecting the existence of the surface echo based on the timing of the echo received from the ends of the material. CONSTITUTION:This device is equipped with a defect echo detecting means 5 which detects a defect echo reflected by a defect of the material (steel pipe) 2 to be inspected from the echo, a surface echo detecting means 62 which detects a surface echo reflected by the surface of the steel pipe 2 from the echo, a surface echo decision means 63 which decides whether or not the echo is surface echo based on the timing of the echo detected by the surface echo detecting means 62, and a defect detection control means 6 which signifies the detection result of the defect echo detecting means 5 only when the surface echo decision means 63 decides that there is the surface echo. Consequently, a water reflection echo and a reflection echo from the end parts of the steel pipe 2 can accurately be removed and an area of flaw nondetection of the end part can be made as small as possible. |
