Interferometric inclinometer for structural monitoring

D. Inaudi, B. Glisic

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

16 Scopus citations


The introduction of long-gauge fiber optic sensors has opened new opportunities for the monitoring of large structures. Using these sensors it is possible to observe the local elongation of a structure and calculate its global deformations. The use of internal sensors detecting integrated strain is however unable to detect the rigid-body motion of a structure, relative to an external reference system. This would require the installation of long deformation sensors connecting the structure with external reference points. Another possibility is to use gravity as a reference to measure vertical rotations of the structure. A gravity-referenced rotation sensor is conventionally called an inclinometer and measures the angle variations between a nominally vertical reference line in the structure and the direction of gravity. It is possible to use uni-axial inclinometers or bi-axial ones, measuring rotations in the two perpendicular vertical planes. Today's inclinometers are based on a variety of techniques and can achieve sensitivities in the micro-radian range. When using fiber optic deformations sensors in a given structure, it would however be interesting to use the same technology to obtain inclination reading. This prompted us to develop a fiber optic-based inclinometer compatible with the SOFO system. This contribution describes the development of this novel sensor and the first measurements obtained with it.

Original languageEnglish (US)
Title of host publication2002 15th Optical Fiber Sensors Conference Technical Digest, OFS 2002
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)0780372891, 9780780372894
StatePublished - 2002
Externally publishedYes
Event15th Optical Fiber Sensors Conference Technical Digest, OFS 2002 - Portland, United States
Duration: May 6 2002May 10 2002

Publication series

Name2002 15th Optical Fiber Sensors Conference Technical Digest, OFS 2002


Other15th Optical Fiber Sensors Conference Technical Digest, OFS 2002
Country/TerritoryUnited States

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture
  • Electrical and Electronic Engineering


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