Fiber optic strain sensor and read-out system
February 14, 2014. 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 ReferencesFluid flow sensing apparatus for in vivo and industrial applications employing novel optical fiber pressure sensors Passive stabilization of a fiber optic nonlinear interferometric sensor Assembly and method for determining the coefficient of thermal expansion of a workpiece Light wave interference length-measuring apparatus Optical fibre measuring system Coherence selective fiber optic interferometric sensor system Fabry-perot optical sensing device for measuring a physical parameter Electric and electromagnetic field sensing system including an optical transducer Patent #: 5280173 InventorsAssigneeApplicationNo. 194960 filed on 02/14/1994US Classes:356/477, Using fiber or waveguide interferometer356/480, Resonant cavity385/12OPTICAL WAVEGUIDE SENSORExaminersPrimary: Turner, Samuel A.Assistant: Kim, Robert H. Attorney, Agent or FirmForeign Patent References
International ClassG01B 009/02AbstractAn optical sensor is described comprising a first optical fiber and a first reflective member. The first optical fiber has a first predetermined length of graded-index multimode optical fiber attached to its end. The first reflective member and the first optical fiber are arranged such that a gap is formed between the unattached end of the graded-index multimode optical fiber and the first reflective member. Also described is a rugged sensor design incorporating the first optical fiber and first reflective sensor as well as a method for providing the predetermined length of graded-index multimode fiber at the end of the first optical fiber. Finally, a readout system for an optical sensor is also described which comprises two optical paths differing in length by an amount equal to an optical path distance in the optical sensor. The readout system also comprises an optical source having a wavelength differing from that of the optical sensor, a modulator and a controller. The readout system provides a linear output signal that is independent of temperature and vibration effects associated with the read-out system.Other References
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