发明名称 |
OPTICAL FIBER BENT SHAPE MEASUREMENT DEVICE AND BENT SHAPE MEASUREMENT METHOD THEREFOR |
摘要 |
PROBLEM TO BE SOLVED: To provide an optical fiber bent shape measurement device and method with which it is possible to perform long distance measurement and seamless distribution measurement in a bend shape sensor technique using an optical fiber.SOLUTION: The optical fiber bent shape measurement device comprises: a Brillouin analyzer 20 for directing the same pump light and the same probe lights into cores C1-C4 of an optical fiber sensor head; and optical receivers 21-24 for measuring, for each of the cores C1-C4, the longitudinal distribution of Brillouin frequency shift amounts in the optical fiber sensor head, finding the strain amounts ε1-ε4 of the cores C1-C4 at each point from the Brillouin frequency shift amounts of the cores C1-C4 at each point, analyzing an angle θ formed by a line linking the center of bend C and the center of cross section of the optical fiber sensor head and a line linking the discretionary core center and the center of the cross section of the optical fiber sensor head and a bend radius r from the strain amounts ε1-ε4, and finding the curvature distribution of the optical fiber sensor head and the direction of curvature at the position from the distribution of the bend radius r.SELECTED DRAWING: Figure 2 |
申请公布号 |
JP2016102691(A) |
申请公布日期 |
2016.06.02 |
申请号 |
JP20140240202 |
申请日期 |
2014.11.27 |
申请人 |
NIPPON TELEGR & TELEPH CORP <NTT> |
发明人 |
KITO CHIHIRO;TAKAHASHI HIROSHI;KOMO KUNIHIRO;MANABE TETSUYA |
分类号 |
G01M11/00;G01B11/16;G01D5/353 |
主分类号 |
G01M11/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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