Sapphire optical fiber interferometer
Patent 5381229 Issued on January 10, 1995. Estimated Expiration Date: 
August 31, 2012. 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.
August 31, 2012. 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 ReferencesCommon optical path interferometric gauge Fiber optic pyrometry with large dynamic range Blackbody radiation sensing optical fiber thermometer system Optical system using a luminescent material sensor for measuring very high temperatures Fiberoptic sensing of temperature and/or other physical parameters Patent #: 4883354 InventorsAssigneeApplicationNo. 937651 filed on 08/31/1992US Classes:356/477, Using fiber or waveguide interferometer250/227.19, With coherent interferrometric light356/43, OPTICAL PYROMETERS356/44, With sample engaging rod or tube374/117, By a vibratory effect (e.g., resonant frequency, acoustical)374/126, Having emissivity compensating or specified radiating surface374/131, With radiation conducting element374/161Change of optical propertyExaminersPrimary: Turner, Samuel A.Assistant: Keesee, LaCharles P. Attorney, Agent or FirmInternational ClassG01R 009/02AbstractAn optical interferometer comprises a multi-mode sapphire fiber as a high temperature sensor. One end of the sapphire fiber is coupled to a silica fiber and, in turn, to the sapphire fiber. The sapphire fiber sensor produces reference and sensor reflections that produce optical fringes at the output of a detector coupled to the silica optical fiber via an opto-coupler. The optical fringes are related to displacements of the sensor which, in turn, can provide an indirect measurement of pressure, strain or temperature of the surface. | |
