Distributed acoustic sensing system with variable spatial resolution
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United States of America Patent
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Jan 16, 2018
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Aug 30, 2013
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Aug 30, 2013
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Abstract
Systems and methods for distributed acoustic sensing based on coherent Rayleigh scattering are disclosed herein. A system comprises a pulse generator, an optical fiber coupled to the pulse generator, an interferometer coupled to the optical fiber, a photodetector assembly coupled to the interferometer, and an information handling system, which activates two optical gain elements so as to vary the optical path length of the interferometer. A method comprises sending an optical pulse down an optical fiber, splitting backscattered light from the optical pulse into a first backscattered pulse and a second backscattered pulse, activating a first optical gain element and a second optical gain element, sending the first backscattered pulse into a first arm of an interferometer, sending the second backscattered pulse into a second arm of an interferometer, combining the first and second backscattered pulses to form an interferometric signal, and receiving the interferometric signal at a photodetector assembly.
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