Dynamic strain sensing in a long-span suspension bridge using fiber Bragg grating sensors

Yinian Zhu, Yan Jin Zhu, Oluwaseyi Balogun, Songye Zhu, You Lin Xu, Sridhar Krishnaswamy

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

4 Citations (Scopus)


Optical fiber sensors are ideal for monitoring continuous deterioration conditions of civil infrastructure, especially of long-span bridges. Typically, a network of sensors is used to measure the strains or low frequency vibrational response of the structure. In this work, we demonstrate dynamic spectral demodulation of fiber Bragg grating (FBG) sensor responses with a stabilized Michelson interferometer for monitoring mechanical strains in a model of long-span bridge. A series of experiments has been performed, including the measurements of the natural resonant modes of the model bridge, impact response of a bridge member and acoustic emissions in a fractured aluminum bar. The experimental results not only reveal that dynamic spectral demodulation of FBG strain responses at frequencies extending up to about 3.5 MHz is possible, but also suggest that the method may be suitable for monitoring high frequency mechanical strains in civil structures that result from cracking or impact loading, thus providing a tool for local detection of structural damage.
Original languageEnglish
Title of host publicationReview of Progress in Quantitative Nondestructive Evaluation
Number of pages6
Publication statusPublished - 10 Nov 2011
Event37th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE - San Diego, CA, United States
Duration: 18 Jul 201023 Jul 2010


Conference37th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE
Country/TerritoryUnited States
CitySan Diego, CA


  • Acoustic Emission
  • Fiber Bragg Gratings
  • Optical Fiber Sensors
  • Structural Health Monitoring

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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