Patent ID: 9146151
Filing Date: 2015-09-29
Classification: G01H

Abstract:
1. A fiber-optic system for distributed acoustic sensing, the system comprising: a first optical source for launching a probe signal at a first wavelength into a segmented sensing fiber, wherein the probe signal comprises a sequence of pulses; a plurality of circulators, each circulator preceding a corresponding segment of the segmented sensing fiber; a plurality of up-lead fiber links, each up-lead fiber link coupled to a corresponding circulator of the plurality of circulators; and a controller module for controlling interrogation of the segmented sensing fiber by detecting and processing backscattered pulses coming from each segment of the segmented sensing fiber; wherein the backscattered pulses from each segment of the segmented sensing fiber are routed by the corresponding circulator via the corresponding up-lead fiber link to the controller module, and wherein analysis of the pulses by the controller module and signal processing utilizing time-division-multiplexing (TDM) technique identify a location of acoustic noise source along the segmented sensing fiber.