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Elliptical-core two mode optical-fiber sensor implementation methods

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4 Author(s)
Murphy, K.A. ; Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA ; Miller, M.S. ; Vengsarkar, Ashish M. ; Claus, R.O.

Experimental methods for the practical implementation of few-mode elliptical-core sensors are described. Techniques for desensitizing the lead-in and lead-out fibers are discussed, and results of a vibration sensor embedded in a graphite-epoxy composite are presented. A scheme using a single-mode elliptical-core fiber as the lead-in fiber and an offset circular-core single-mode fiber as the lead-out fiber is successfully implemented. Detection techniques for few-mode fiber sensors are reviewed, and a novel fringe-counting method to unambiguously detect the amplitude and direction of dynamic strain is reported

Published in:

Lightwave Technology, Journal of  (Volume:8 ,  Issue: 11 )

Date of Publication:

Nov 1990

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