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Optical Fiber Loop Sensors for Structural Health Monitoring of Composites

Published online by Cambridge University Press:  01 February 2011

Nguyen Q Nguyen  and
Nikhil Gupta
Nguyen Q Nguyen
Affiliation:
nnguye02@students.poly.edu, Polytechnic Institute of New York University, Mechanical and Aerospace Engineering, Brooklyn, New York, United States
Nikhil Gupta
Affiliation:
ngupta@poly.edu, Polytechnic Institute of New York University, Mechanical and Aerospace Engineering, Brooklyn, New York, United States
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Abstract

In the present work a fiber-optic loop-sensor is designed and tested for possible applications in structural health monitoring of composite materials. It is known that bending an optical fiber beyond a critical curvature leads to loss of optical power through the curved region. The optical power loss depends on the radius of curvature of the loop. The optical power can be measured by a photodetector and a change in the power due a change to the curvature can be measured. In the present research optical fiber-optic loop-sensors are developed that can exploit this concept. Single-mode optical fiber sensors having different loop radii, from 6-10 mm, are fabricated and calibrated for applied strain on the loop. The calibration is carried out using a 0.098 N load cell and a computer controlled translation stage having 50 nm step resolution. Results show that the sensors provide highly repeatable curves for loading and unloading cycles. Smaller loop radii lead to higher optical power losses, resulting in higher sensitivity. Calibration results show that such sensors can be used in structural health monitoring applications. In this approach the coating and cladding of optical fibers are maintained intact; therefore, the sensors are robust and can withstand several composites fabrication processes.

Keywords

opticalsensorlaser
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1129: Symposium V – Materials and Devices for Smart Systems III , 2008 , 1129-V07-11
Copyright
Copyright © Materials Research Society 2009

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