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Journal of Sensors
Volume 2016, Article ID 1284520, 8 pages
Review Article

Review of the Strain Modulation Methods Used in Fiber Bragg Grating Sensors

School of Civil Engineering and Built Environment, Queensland University of Technology, Brisbane, QLD 4000, Australia

Received 4 October 2015; Revised 23 December 2015; Accepted 29 December 2015

Academic Editor: Emily J. Hao

Copyright © 2016 Kuo Li. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Fiber Bragg grating (FBG) is inherently sensitive to temperature and strain. By modulating FBG’s strain, various FBG sensors have been developed, such as sensors with enhanced or reduced temperature sensitivity, strain/displacement sensors, inclinometers, accelerometers, pressure meters, and magnetic field meters. This paper reviews the strain modulation methods used in these FBG sensors and categorizes them according to whether the strain of an FBG is changed evenly. Then, those even-strain-change methods are subcategorized into (1) attaching/embedding an FBG throughout to a base and (2) fixing the two ends of an FBG and (2.1) changing the distance between the two ends or (2.2) bending the FBG by applying a transverse force at the middle of the FBG. This review shows that the methods of “fixing the two ends” are prominent because of the advantages of large tunability and frequency modulation.