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Novel Fiber-Optic Sensors

Sensors

  1. Kara Peters

Published Online: 15 SEP 2009

DOI: 10.1002/9780470061626.shm025

Encyclopedia of Structural Health Monitoring

Encyclopedia of Structural Health Monitoring

How to Cite

Peters, K. 2009. Novel Fiber-Optic Sensors. Encyclopedia of Structural Health Monitoring. .

Author Information

  1. North Carolina State University, Department of Mechanical and Aerospace Engineering, Raleigh, NC, USA

Publication History

  1. Published Online: 15 SEP 2009

Abstract

This article reviews novel fiber-optic sensors for the measurement of strain and temperature that are based on recently developed optical fiber technologies. Sensors based on surface relief gratings and sapphire optical fibers for high-temperature environments are presented. Additionally, the response of fiber Bragg gratings in extremely low-temperature environments is discussed. The optical and mechanical response of newly developed single-mode polymer optical fibers over large-strain ranges is explained, along with the fabrication of FBGs in such fibers. As compared to conventional silica fibers, single-mode polymer optical fibers demonstrate increased phase sensitivity to strain and negative phase sensitivity to temperature. Recently fabricated microstructured optical fibers, which demonstrate little or no temperature sensitivity and can incorporate a variety of sensors with novel properties, are also reviewed. Multicore optical fibers, which have been applied for the measurement of local curvatures and networked for the measurement of the shape of flexible structures, are also discussed. Finally, recent examples of the application of microelectromechanical system (MEMS) technology to the fabrication of optical fiber sensors, including focused ion beam machining, are presented.

Keywords:

  • high temperature;
  • low temperature;
  • large deformation;
  • polymer optical fiber;
  • fiber Bragg grating;
  • multicore optical fiber;
  • shape sensing