| 摘要 |
PURPOSE:To enable detection without errors in a flawed part by forming a synthesized image in which a background is erased from the continuously photographed flaw pattern by magnetic particles. CONSTITUTION:When the negatives P1, P2- on which the flaw patterns of magnetic particles are continuously photographed are superposed, the parts of a flaw 4 overlap and the magnetic particles move in the other parts and therefore the other parts do not overlap. If the negatives P1, P2- are photographed in the overlapped state, only the part of the flaw 4 appears and the synthetic image in which the part of the background is erased is formed on a negative Ps. As a result, the flaw part is detected without any error. |
