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Single-Mode Polymer Optical Fiber Sensors for Large Strain Applications

Published online by Cambridge University Press:  26 February 2011

Sharon M. Kiesel ,
Kara Peters ,
Tasnim Hassan  and
Mervyn Kowalsky
Sharon M. Kiesel
Affiliation:
smkiesel@ncsu.edu, North Carolina State University, Mechanical and Aerospace Engineering, Campus Box 7910, 3211 Broughton Hall, Raleigh, NC, 27695, United States
Kara Peters
Affiliation:
kjpeters@eos.ncsu.edu, North Carolina State University, Mechanical and Aerospace Engineering, Campus Box 7910, 3211 Broughton Hall, Raleigh, NC, 27695, United States
Tasnim Hassan
Affiliation:
thassan@eos.ncsu.edu, North Carolina State University, Department of Civil, Construction and Environmental Engineering, 208 Mann Hall, NCSU Campus Box 7908, Raleigh, NC, 27695, United States
Mervyn Kowalsky
Affiliation:
kowalsky@eos.ncsu.edu, North Carolina State University, Department of Civil, Construction and Environmental Engineering, 208 Mann Hall, NCSU Campus Box 7908, Raleigh, NC, 27695, United States
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Abstract

This paper characterizes an intrinsic, single-mode, polymer optical fiber (POF) sensor for use in large-strain applications such as civil infrastructures subjected to earthquake loading or systems with large shape changes such as morphing aircraft. The opto-mechanical response was formulated for the POF including a second-order (in strain) photoelastic effect as well as a second-order (in strain) solution for the deformation of the POF during loading. It is shown that four independent mechanical and opto-mechanical constants are required for the small deformation regime and six additional independent mechanical and opto-mechanical constants are required for the large deformation regime. The mechanical nonlinearity of a typical polymer optical fiber was experimentally measured in tension at various loading rates. The secant modulus of elasticity measured at small strains, roughly up to 2% strain, was measured to be ∼4GPa whereas at larger strains, roughly up to 4.5% strain, the secant modulus was measured to be ∼4.8GPa. As the loading rate was increased the yield strain increased, ranging from ∼3.2% at 1mm/min to ∼5% at 305 mm/min.

Keywords

fiberstress/strain relationshippolymer
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 969: Symposium W – Heterogeneous Integration of Materials for Passive Components and Smart Systems , 2006 , 0969-W05-05
Copyright
Copyright © Materials Research Society 2007

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