Fiber-optic sensors for concrete strain/stress measurement

Antonio Nanni, C. C. Yang, Kun Pan, Jy Shiaw Wang, Robert R. Michael

Research output: Contribution to journalArticlepeer-review

65 Scopus citations


Presents a nondestructive testing method based on fiber optics for measuring strain and stress in concrete structures in situ. When an optical fiber is embedded in concrete, and its refractive index, dimension, and/or shape are changed as a result of the surrounding matrix deformation, the characteristics of the light signal transmitted along the fiber are modified. Optical techniques capable of determining the changes in light characteristics (intensity, polarization, and phase) are described. The two most promising techniques for concrete-structures diagnostics are demonstrated in the laboratory using concrete cylinders subjected to unconfined uniaxial compression with optical fibers embedded in a direction parallel and perpendicular to the applied strain (load). Encouraging experimental results indicate that fiber-optic sensors can be a feasible tool to determine strain/stress distribution in buildings and infrastructures.

Original languageEnglish (US)
Pages (from-to)257-264
Number of pages8
JournalACI Materials Journal
Issue number3
StatePublished - May 1 1991
Externally publishedYes

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)


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