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US 12,018,941 B2Granted
Extended reach ring interferometer having reference coil for mitigating signal fading
OwnerZbigniew Sobolewskiinventor
Life of this patent
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Abstract
An optical fiber ring interferometer is provided, which is based on a common light path for two or more light beam pairs preferably originated from two or more light sources of a substantially different spectrum or from a single light source split spectrum and whereas each light beam of a specific pair is propagating in relative opposite directions, wherein at least one pair of light beams is utilized to detect acousto-mechanical events and to provide information regarding location and other characteristics of detected environmental disturbance.
Claims4
A fiberoptic ring interferometer system comprising:
- a light source;
- a light detector;
- a light beam splitter;
- a light depolarizer;
- a reference coil of optical fibers;
- and
- a fiberoptic sensing extension;
- wherein the reference coil is a part of the fiberoptic sensing extension and the reference coil is positioned at the center of the fiberoptic sensing extension, the system being configured such that a light beam from the light source can travel through the light beam splitter adapted to split the light beam into a pair of light beams counterpropagating through the fiberoptic sensing extension and the light depolarizer, and back to the light beam splitter and lastly to the light detector.
5 more elements
Dependencies are inferred from the claim text.