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US 2026/0063468 A1Published application
Fiber sensor for distributed acoustic sensing based on polarization detection
OwnerXiaotian Steve Yaoinventor
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Abstract
This patent document discloses designs of distributed acoustic sensing (DAS) fiber sensors that making distributed acoustic sensing measurements using a sensing fiber based on variations over time of the state of polarization of backscattered light returned from the sensing fiber to extract local phase disturbances at various locations along the sensing fiber.
Claims11
An optical sensing device for distributed acoustic sensing using a sensing fiber, comprising:
- a laser to produce laser light;
- an optical modulator located to receive the laser light from the laser to produce laser pulses for sensing local phase disturbances at various locations along the sensing fiber to cause scattering of the laser pulses to generate backscattered light;
- and
- an optical polarimeter to receive a portion of the backscattered light returned from the sensing fiber to measure Stokes parameters of state of optical polarization of the backscattered light at various locations in the sensing fiber that carry information of variations over time in the state of optical polarization of the backscattered light indicative of the local acoustic disturbances at various locations along the sensing fiber.
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