Damage detection in FRP structures using fiber Bragg grating dynamic strain sensing systems

Yan Zhu, Yinian Zhu, Li Hui, Sridhar Krishnaswamy

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

3 Scopus citations


Fiber optic sensors have become widely used for structural health monitoring in recent decades. The aim of this research is to characterize the dynamic failure signals emitted in fiber reinforced polymer (FRP) stay cable and specimens using Fiber Bragg Gratings (FBGs) and two types of interferometric demodulation systems, namely Michelson interferometer (MI) and two-wave mixing interferometer (TWMI) for detection. Due to its one-dimensional form, only one FBG and the Michelson interferometer are used for damage monitoring in a carbon FRP stay cable under various types of loading. Michelson interferometer is capable of detecting frequency contents extending up to 500 kHz, where frequency contents below 250 kHz are categorized as matrix failure and those above 300 kHz corresponded to fiber failure. Two channels of FBGs are used with the TWM interferometer to track local damage in coupon-size FRP samples. Using TWM scheme, continuous and burst acoustic emission events are detected with frequency responses extending up to 125 kHz in coupon-size GFRP specimens, limited only by the sampling rate of the data acquisition system. The experimental results suggest that both types of FBG demodulation systems may be suitable for monitoring high frequency mechanical strains in civil structures, providing a tool for local structural damage detection.

Original languageEnglish (US)
Title of host publicationSmart Sensor Phenomena, Technology, Networks, and Systems 2011
StatePublished - May 23 2011
EventSmart Sensor Phenomena, Technology, Networks, and Systems 2011 - San Diego, CA, United States
Duration: Mar 7 2011Mar 9 2011

Publication series

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


OtherSmart Sensor Phenomena, Technology, Networks, and Systems 2011
Country/TerritoryUnited States
CitySan Diego, CA


  • Optical fiber sensors
  • acoustic emission
  • fiber reinforced polymer
  • optical fiber Bragg gratings
  • strain measurement
  • structural health monitoring

ASJC Scopus subject areas

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


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