Standard Article

Fiber Bragg Grating Sensors

Sensors

  1. Kara Peters

Published Online: 15 SEP 2009

DOI: 10.1002/9780470061626.shm024

Encyclopedia of Structural Health Monitoring

Encyclopedia of Structural Health Monitoring

How to Cite

Peters, K. 2009. Fiber Bragg Grating 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 the principles and application of optical fiber Bragg gratings (FBGs) as strain and temperature sensors for structural health monitoring applications. FBG sensors have many advantages for strain sensing in such applications including their small size, the potential to multiplex hundreds of sensors with a single ingress/egress fiber, their immunity to electromagnetic interference, and their corrosion resistance. The spectral properties of FBGs and their response to applied strain and temperature fields are derived. Multiplexing and interrogation strategies for large sensor networks are presented. Special focus is placed on the response of FBGs to multiaxis strain fields and rapidly varying strain fields such as near the location of structural damage. Common approaches to invert the spectral response of an FBG subjected to a complex strain field are also reviewed. Finally, this article reviews common fabrication techniques for FBGs and their relative impacts on the strength of these sensors.

Keywords:

  • optical fiber sensor;
  • fiber Bragg grating;
  • long period grating;
  • wavelength division multiplexing;
  • multiaxis sensor