| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical fiber vibration sensor of the Sagnac interference type capable of detecting vibration, and also obtaining position information where the vibration generates. SOLUTION: In the optical fiber vibration sensor of the Sagnac interference type which includes optical fiber loops 2a and 2b deployed along a structure 4 detecting vibration and a vibration sensor body 3 detecting vibration generated in the structure 4 through the optical fiber loop 2a and 2b, while partitioning the structure 4 into two test object domains A and B in a longitudinal direction, the optical fiber loops 2a and 2b are deployed in both test object domains A and B, respectively, along the structure 4, position information is detected on the structure 4 the vibration generates from the intensity difference, the intensity ration, and the phase difference of vibration detected by both optical fiber loops 2a and 2b. COPYRIGHT: (C)2010,JPO&INPIT |
