Two-mode elliptical-core weighted fiber sensors for vibration analysisTwo-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.
Document ID
19930065430
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Vengsarkar, Ashish M. (NASA Langley Research Center Hampton, VA, United States)
Murphy, Kent A. (NASA Langley Research Center Hampton, VA, United States)
Fogg, Brian R. (NASA Langley Research Center Hampton, VA, United States)
Miller, William V. (NASA Langley Research Center Hampton, VA, United States)
Greene, Jonathan A. (NASA Langley Research Center Hampton, VA, United States)
Claus, Richard O. (Virginia Polytechnic Inst. and State Univ. Blacksburg, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Distributed and multiplexed fiber optic sensors; Proceedings of the Meeting, Boston, MA, Sept. 4, 5, 1991 (A93-49426 21-35)
Publisher: Society of Photo-Optical Instrumentation Engineers