| 摘要 |
PURPOSE:To detect the leakage of water from a cooling pipe without the influence of electromagnetic induction, by measuring the quantity of light, which is charged from one ends of optical fiber lines provided in parallel under the cooling pipe, in the side of the other ends. CONSTITUTION:An extrahigh voltage power cable 6 is stored and laid in a through 7, and a water supply-side cooling pipe 8a and a return-side cooling pipe 8b are provided in parallel above the cable, and optical fiber lines 9a and 9b are provided in parallel just under cooling pipes below the cable. A detecting part 15 where a part of a protection layer 14 is cut to expose the surface of an optical fiber 13 is arranged just under a connection part 16 between cooling pipes. The optical signal charged by a light transmitter 17 is detected by a light receiver 18. If the detecting part 15 is covered with cooling water because of the leakage of water from cooling pipes, this optical signal is refracted partially; and thus, the change of the quantity of light is measured in transmission and reception ends to detect whether cooling water is leaked or not. |
