| 摘要 |
PROBLEM TO BE SOLVED: To detect the deformation state of a structure or the movement state of a stratum with high accuracy, by forming plural storage grooves for storing optical fibers, and by fixing the optical fibers in each storage groove. SOLUTION: Two optical fibers 14A, 14B of an optical fiber sensor are connected to an integration circuit 40 used as an operation means installed in an optical strain measuring apparatus 35 through a switching apparatus. As light from only one optical fiber can be measured by the optical strain measuring apparatus 35, connection between the optical fiber to be measured and the optical strain measuring apparatus 35 is switched sequentially by the switching apparatus. Displacement of an optional position of the optical fiber sensor is obtained by executing integration by the integration circuit 40. The result of integration by the integration circuit 40 is outputted to a personal computer 45, and the personal computer 45 operates so that the deformation state of the optical fiber sensor can be recognized visually, and displays the deformation state on a display. Therefore, an operator can recognize simultaneously the deformation state of a measuring object.
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