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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.
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 times are gotten. Location of the vibration is analyzed through mathematical-physical equations. vibration frequency, amplitude, and location are theoretically simulated. results agree well with the previous experiments.