Based on Sagnac interferometer, a simple distributed optical fiber sensing system with sub-loop is presented to monitor the vibration applied on the sensing fiber. By introducing a sub-loop, three output beams of interference with different delay time are gotten. Location of the vibration is analyzed through mathematical-physical equations. The vibration frequency, amplitude, and location are theoretically simulated. The results agree well with the previous experiments.
© 2009 Chinese Optics Letters
(040.0040) Detectors : Detectors
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(140.3510) Lasers and laser optics : Lasers, fiber
(250.0250) Optoelectronics : Optoelectronics
Weimin Chen, Yuanyuan Xie, Peng Zhang, and Lei Lin, "Localization theory of distributed fiber vibration sensor," Chin. Opt. Lett. 7, 186-187 (2009)