A curvature based approach using long-gage fiber optic sensors

Kaitlyn Kliewer, Branko Glisic

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

Fiber Bragg grating (FBG) sensors offer a significant advantage for structural health monitoring due to their ability to simultaneously monitor both static and dynamic strain while being durable, lightweight, capable of multiplexing, and immune to electro-magnetic interference. Drawing upon the benefits of FBG sensors, this research explores the use of a series of long-gage fiber optic sensors for damage detection of a structure through dynamic strain measurements and curvature analysis. Typically structural monitoring relies upon detecting structural changes through frequency and acceleration based analysis. However, curvature and strain based analysis may be a more reliable means for structural monitoring as they show more sensitivity to damage compared to modal parameters such as displacement mode shapes and natural frequency. Additionally, long gage FBG strain sensors offer a promising alternative to traditional dynamic measurement methods as the curvature can be computed directly from the FBG strain measurements without the need for numerical differentiation. Small scale experimental testing was performed using an aluminum beam instrumented with a series of FBG optical fiber sensors. Dynamic strain measurements were obtained as the aluminum beam was subjected to various loading and support conditions. From this, a novel normalized parameter based on the curvature from the dynamic strain measurements has been identified as a potential damage sensitive feature. Theoretical predictions and experimental data were compared and conclusions carried out. The results demonstrated the potential of the novel normalized parameter to facilitate dynamic monitoring at both the local and global scale, thus allowing assessment of the structures health.

Original languageEnglish (US)
Title of host publicationHealth Monitoring of Structural and Biological Systems 2016
EditorsTribikram Kundu
PublisherSPIE
ISBN (Electronic)9781510600461
DOIs
StatePublished - Jan 1 2016
EventHealth Monitoring of Structural and Biological Systems 2016 - Las Vegas, United States
Duration: Mar 21 2016Mar 24 2016

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9805
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherHealth Monitoring of Structural and Biological Systems 2016
CountryUnited States
CityLas Vegas
Period3/21/163/24/16

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Keywords

  • Structural health monitoring
  • curvature
  • damage sensitive feature
  • dynamic strain measurements
  • long-gage fiber optic sensors

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  • Cite this

    Kliewer, K., & Glisic, B. (2016). A curvature based approach using long-gage fiber optic sensors. In T. Kundu (Ed.), Health Monitoring of Structural and Biological Systems 2016 [980520] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9805). SPIE. https://doi.org/10.1117/12.2219323