Combined static and dynamic monitoring of civil structures with long-gauge fiber optic sensors

Daniele Inaudi, Daniele Posenato, Branko Glisic, Jeff Miller, Tom Graver

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

9 Scopus citations


Long-gauge SOFO® sensors have been in use for the last 10 years for the monitoring of civil, geotechnical, oil & gas and other structures. More than 3500 sensors have been installed worldwide in a number of different structure types. The original demodulation system is based on low-coherence interferometry and is particularly suitable for the monitoring of long-term static deformations. This paper reports the development and testing of a new sensing system based on Fiber Bragg Gratings and allowing the monitoring of both the static as the dynamic response of structures. The sensors are based on the well-proven SOFO packaging and allow the measurement of deformations over measurement basis of 2m, with a resolution of 1 microstrain and a frequency of 250 Hz. The system is insensitive to temperature variations, electromagnetic disturbances (electric power lines, lightning) and has demonstrated excellent long-term stability and durability. Each sensor also contains a temperature gauge, useful for the evaluation of the ambient parameters. This contribution describes the FBG-based MuST system, its functional principles and its performances in laboratory and field tests. The field installations include the monitoring of concrete bridges.

Original languageEnglish (US)
Title of host publicationIMAC-XXIII
Subtitle of host publicationConference and Exposition on Structural Dynamics - Structural Health Monitoring
StatePublished - 2005
Externally publishedYes
Event23rd Conference and Exposition on Structural Dynamics 2005, IMAC-XXIII - Orlando, FL, United States
Duration: Jan 31 2005Feb 3 2005

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652


Other23rd Conference and Exposition on Structural Dynamics 2005, IMAC-XXIII
Country/TerritoryUnited States
CityOrlando, FL

All Science Journal Classification (ASJC) codes

  • General Engineering
  • Computational Mechanics
  • Mechanical Engineering


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