Optical fiber sensors for harsh environments
March 4, 2024. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesFiber optic coupled pressure transducer using single fiber and method of fabrication Method of manufacturing a terminal device for an optical fiber, and device thus obtained Optical communication systems using Fabry-Perot cavities Fluid flow sensing apparatus for in vivo and industrial applications employing novel optical fiber pressure sensors Sensor device Fabry-perot optical sensing device for measuring a physical parameter Extrinsic fiber optic displacement sensors and displacement sensing systems Optical fiber termination device Hybrid fiber optic sensor including a lead out optical fiber having a remote reflective end Sapphire optical fiber interferometer InventorsAssigneeApplicationNo. 10791842 filed on 03/04/2004US Classes:356/480, Resonant cavity385/12, OPTICAL WAVEGUIDE SENSOR356/35.5, By light interference detector (e.g., interferometer)356/477, Using fiber or waveguide interferometer250/227.19With coherent interferrometric lightExaminersPrimary: Toatley, Gregory J. Jr.Assistant: Connolly, Patrick Attorney, Agent or FirmForeign Patent References
International ClassesG01B 9/02G02B 6/00 AbstractA diaphragm optic sensor comprises a ferrule including a bore having an optical fiber disposed therein and a diaphragm attached to the ferrule, the diaphragm being spaced apart from the ferrule to form a Fabry-Perot cavity. The cavity is formed by creating a pit in the ferrule or in the diaphragm. The components of the sensor are preferably welded together, preferably by laser welding. In some embodiments, the entire ferrule is bonded to the fiber along the entire length of the fiber within the ferrule; in other embodiments, only a portion of the ferrule is welded to the fiber. A partial vacuum is preferably formed in the pit. A small piece of optical fiber with a coefficient of thermal expansion chosen to compensate for mismatches between the main fiber and ferrule may be spliced to the end of the fiber.Other References
Field of SearchBy light interference detector (e.g., interferometer)Using fiber or waveguide interferometer Multiplexed sensor array Resonant cavity Having partially reflecting plates in series (e.g., Fabry-Perot type) With coherent interferrometric light With coherent interferrometric light OPTICAL WAVEGUIDE SENSOR | |
