Unbalanced fiber optic Michelson interferometer as an optical pick-off
July 13, 2018. 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 ReferencesDifferential pressure measuring apparatus Optical resonator single-mode fiber hydrophone Optical pressure sensing apparatus Coherence multiplexing of optical sensors Interferometric pressure sensor capable of high temperature operation and method of fabrication Optical resonance accelerometer Optical signal detection apparatus and method for preventing polarization signal fading in optical fiber interferometric sensor systems Method of producing a condenser lens substrate Apparatus and method for ion beam polishing and for in-situ ellipsometric deposition of ion beam films Physical quantity measurement apparatus and instrument therefor InventorsApplicationNo. 114582 filed on 07/13/1998US Classes:356/450, BY LIGHT INTERFERENCE (E.G., INTERFEROMETER)356/35.5, By light interference detector (e.g., interferometer)356/477Using fiber or waveguide interferometerExaminersPrimary: Font, Frank G.Assistant: Lee, Andrew H. Attorney, Agent or FirmForeign Patent References
International ClassG01B 009/02AbstractA system for measuring changes in an environmental parameter, such as velocity or pressure, includes an optical signal source for providing a coherent light signal, and an interferometer having a first and second optical legs of unequal optical path lengths. The signal is split into first and second beams that are respectively directed into the first and second optical legs of the interferometer. A fixed mirror reflects the first beam received at the end of the first optical leg. An optical pick-off includes a movable mirror, positioned to reflect the second beam received from the end of the second optical leg. The movable mirror is movable in response to changes in the value of the parameter to be measured. An optical coupler combines the first and second beams after they have been reflected back into their respective optical legs, producing an interference signal, which is detected by an optical detector. The detector generates an electronic signal having a value indicative of the value of the interference signal. The electronic signal is analyzed to correlate its value to changes in the value of the environmental parameter to be measured.Other References
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