| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a Sagnac interference-type optical fiber vibration sensor which cannot only detect vibration, but which also can obtain positional information on the location where the vibration is occurring. Ž<P>SOLUTION: The Sagnac interference-type optical fiber vibration sensor 1, including optical fiber loops 2a, 2b which are arranged along a structure 4, such as a fence, generating the vibration to be detected, and a vibration sensor body 3 which detects the vibration generated by the structure 4 via the optical fiber loops 2a, 2b, is such that the plural optical fiber loops 2a, 2b which are arranged along the structure 4 are configured to have length values that differ from one another. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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