| 摘要 |
PROBLEM TO BE SOLVED: To provide a detection device of a position in a pipe capable of determining sound speed accurately even without information on transmission and reception positions of the sound in the pipe filled with water, and resultantly detecting accurately the position of an inspection device. SOLUTION: The underwater sound 47 emitted from a sound wave transmitter 32 loaded on ROV 11 for inspection is propagated in the water in a PLR pipe 7, and can be received by a sound wave receiver 39 loaded on ROV 13 for support. Each route distance in the PLR pipe 7 of the ROV 11 for inspection and the ROV 13 for support, namely, a relative distance between the ROV 13 for support and the ROV 11 for inspection, is calculated from a difference of each transmission and reception timing of the underwater sound 47 and the underwater sound speed. COPYRIGHT: (C)2008,JPO&INPIT
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