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Proceedings Paper

Multiplexed fiber optic strain sensor system
Author(s): Mohammed R. Sayeh; Lalit Gupta; D. Kagaris; R. Viswanathan; B. Chung
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Paper Abstract

This paper presents a multimode fiber optic sensor system suitable for large smart structures. By many observations of speckle patterns from different multimode fibers, it seems that each speckle pattern has its own signature and uniquely defining its fiber. This prompted us to superimpose (multiplexed) the speckle patterns generated by two different fibers, and detect the resultant pattern. A two-stage feature extraction algorithm is then applied on the image, which reduces the dimension of the pattern vector. Next, a backpropagation neural network with single hidden layer is trained in mapping the feature vectors to the stress applied on each fibers. Series of experiments are conducted on two fiber sensors glued on a square shape plate under different point loads. The sensors successfully estimated that which fiber was under stress with light or heavy weight.

Paper Details

Date Published: 31 May 1999
PDF: 6 pages
Proc. SPIE 3670, Smart Structures and Materials 1999: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (31 May 1999); doi: 10.1117/12.349751
Show Author Affiliations
Mohammed R. Sayeh, Southern Illinois Univ./Carbondale (United States)
Lalit Gupta, Southern Illinois Univ./Carbondale (United States)
D. Kagaris, Southern Illinois Univ./Carbondale (United States)
R. Viswanathan, Southern Illinois Univ./Carbondale (United States)
B. Chung, Southern Illinois Univ./Carbondale (United States)


Published in SPIE Proceedings Vol. 3670:
Smart Structures and Materials 1999: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials
Richard O. Claus; William B. Spillman, Editor(s)

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