| 摘要 |
PURPOSE:To easily and speedily decides whether a connection is made normally or not by extracting the image of a welding part at the time of the fusion, and deciding the splicing condition from position shifts of the rising and falling parts of the light intensity distribution at a specific position. CONSTITUTION:When an optical fiber is fused, the light intensity distribution perpendicular to the axial direction of the fiber 1 is extracted at the connection center 13 of an area which is heated and seen brightly through a television camera and positions 12 and 14 at distance of about the diameter of the fiber 1 from the center 13 to both sides. Position shifts of rise parts ya,u, yb,u, and yc,u and fall parts ya,l, yb,l, and yc,l are observed. When the connection is made normally, those parts do not shift in position. If, however, an air bubble 5 is generated at the connection part 31, the interval between ya,u and ya,l of the light intensity distribution 25 at the center 13 increases and the air bubble can be detected. When the air bubble bursts or when the splicing part becomes a sphere, they can be detected from position shifts. In this way, whether the connection is normal or not is speedily and easily decided, so the method is effectively used to automatic connecting operation. |
