| 摘要 |
PROBLEM TO BE SOLVED: To precisely measure the distortion quantity of a structure over a wide area for a long time with a relatively simple constitution, and to make measurable the distortion quantity even when a local crack is generated without hindrance, in particular. SOLUTION: In this wide-area distortion distribution measuring system, a measurement controlling personal computer 6, an OTDR module 7, an optical switch module 8, and optical fiber type highly sensitive strain gages 21, 22, 23,..., 2n/m1, m2, m3,..., mn are connected in series by connecting optical fiber 2, 2,... to constitute a rosary-like measuring system. Two systems are provided in the rosary-like measuring system in this case, and switched properly by the optical switch module 8 to conduct the measurement. For example, when the crack is generated in around any of the specified optical fiber type highly sensitive strain gages, the generation of a crack can be detected by the optical fiber 2 in the vicinity thereof, although distortion transmission to the strain gage is interrupted. COPYRIGHT: (C)2003,JPO
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