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Application of Intensity-Based Coherent Optical Time Domain Reflectometry to Bridge Monitoring.

Xin Lu1, Sebastian Chruscicki1, Marcus Schukar1

  • 1Bundesanstalt für Materialforschung und -prüfung, Unter den Eichen 87, 12205 Berlin, Germany.

Sensors (Basel, Switzerland)
|May 20, 2022
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Summary
This summary is machine-generated.

This study reports novel distributed vibration measurements on a bridge during destructive testing using coherent optical time domain reflectometry (COTDR). Unexpected signals detected suggest internal bridge damage, potentially cracks.

Keywords:
destructive testingdistributed acoustic sensingdistributed fiber sensingstructural health monitoring

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Area of Science:

  • Structural Engineering
  • Fiber Optic Sensing
  • Vibration Analysis

Background:

  • Distributed fiber sensing is crucial for structural health monitoring.
  • Limited data exists on bridge monitoring during destructive testing.

Purpose of the Study:

  • To present the first reported distributed vibration measurements during a bridge's destructive test.
  • To analyze sawing-induced vibrations and detect potential internal damage.

Main Methods:

  • Utilized coherent optical time domain reflectometry (COTDR) for vibration acquisition.
  • Performed time and frequency domain analysis, including short-time Fourier transform.
  • Conducted a three-day destructive test on an decommissioned bridge.

Main Results:

  • Characterized sawing-induced vibrations, revealing high-frequency components up to 20 kHz.
  • Observed all vibration components occurring within the same time slot.
  • Detected unexpected signals distinct from sawing vibrations, indicating potential internal damage.

Conclusions:

  • COTDR successfully captured detailed vibration data during destructive bridge testing.
  • Unexpected signals provide evidence for internal bridge damage, possibly crack formation.
  • This research establishes a precedent for using distributed fiber sensing in extreme structural testing scenarios.