Publication Date:
2011-08-24
Description:
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.
Keywords:
INSTRUMENTATION AND PHOTOGRAPHY
Type:
In: Distributed and multiplexed fiber optic sensors; Proceedings of the Meeting, Boston, MA, Sept. 4, 5, 1991 (A93-49426 21-35); p. 53-66.
Format:
text
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