1 January 1992 Two-mode elliptical-core weighted fiber sensors for vibration analysis
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Two-mode, elliptical-core optical fibers are demonstrated in weighted, distributed and selective vibration-mode-filtering applications. We show how appropriate placement of optical fibers on a vibrating structure can lead to vibration mode filtering. Selective vibration-mode suppression on the order of 10 dB has been obtained using tapered two-mode, circular-core fibers with tapering functions that match the second derivatives of the modes of vibration to be enhanced. We also demonstrate the use of chirped, two-mode gratings in fibers as spatial modal sensors that are equivalents of shaped piezoelectric sensors.
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Ashish M. Vengsarkar, Ashish M. Vengsarkar, Kent A. Murphy, Kent A. Murphy, Brian R. Fogg, Brian R. Fogg, William V. Miller, William V. Miller, Jonathan A. Greene, Jonathan A. Greene, Richard O. Claus, Richard O. Claus, } "Two-mode elliptical-core weighted fiber sensors for vibration analysis", Proc. SPIE 1586, Distributed and Multiplexed Fiber Optic Sensors, (1 January 1992); doi: 10.1117/12.56507; https://doi.org/10.1117/12.56507

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