FBG-based vibration sensor using gravity effects for large infrastructures

Hiroki Kazama, Akira Mita

Research output: Contribution to journalArticle

1 Citation (Scopus)


A simple mechanism for a vibration sensor based on fiber Bragg grating (FBG) is proposed. The mechanism utilizes the gravity force to allow the maximum sensitivity of the sensor into vertical direction while the minimum sensitivity for other two transverse directions. The sensor consists of a FBG cable and several masses to form a vibration system. The cable is extended to introduce a certain tensile force and acts as a spring. The sensitivity of the sensor is more than 1 μstrain/gal for vertical direction. This simple sensor has been developed for damage detection of large structures. Several prototypes were fabricated. And extensive shaking table tests were conducted to examine the performance.

Original languageEnglish
Pages (from-to)159s-166s
JournalStructural Engineering/Earthquake Engineering
Issue number2
Publication statusPublished - 2005 Dec 1


  • FBG accelerometer
  • Smart infrastructure
  • Vibration sensor

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Arts and Humanities (miscellaneous)
  • Geotechnical Engineering and Engineering Geology

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