| 摘要 |
PURPOSE:To detect defects on surfaces of a metallic pipe and a metallic plate with less noises by moving plural parallel arranged detectors and preventing them from oscillating. CONSTITUTION:Plural parallel detectors 20 are arranged on the machine table 1 of a flaw detector A and adjusted upward and downward by a fitting device 41 to approach the metallic surface. Further, the machine table 1 is equipped with a running machine 10 having caterpillars and it is driven forth and back by a centralized controller 17. Further, a television camera 11 and a lighting lamp 12 are provided atop of the machine table 1 and an image is displayed on a cathode-ray tube 16. This flaw detector A is loaded in the metallic pipe 3 and the detector 20 is advanced over a lock through the television camera 11 to display a defect in the metallic pipe surface on an output device 6. The detector 20 uses an ultrasonic wave, laser light, etc. Therefore, there is no mechanically movable part which makes a sweep on the inspected surface and inspection is carried out by advancing the detectors 20 which are arranged closely in parallel simultaneously, so the inspection is performed with less noise and the inspecting device is reduced in weight. |
