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Scheimpflug Camera-Based Technique for Multi-Point Displacement Monitoring of Bridges.

Lei Xing1, Wujiao Dai1, Yunsheng Zhang1

  • 1School of Geosciences and Info-Physics, Central South University, Changsha 410083, China.

Sensors (Basel, Switzerland)
|June 10, 2022
PubMed
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This study introduces a low-cost Scheimpflug camera system for precise, multi-point bridge displacement measurement. The method significantly reduces motion errors, offering a stable and accurate alternative to complex multi-camera setups.

Area of Science:

  • Civil Engineering
  • Optical Metrology
  • Structural Health Monitoring

Background:

  • Conventional cameras have limited field of view (FOV) and depth of field (DOF), hindering precise multi-point displacement measurement on large structures like bridges.
  • Multi-camera systems increase cost, complexity, and instability exponentially with the number of cameras.

Purpose of the Study:

  • To propose a novel, low-cost multi-point displacement measurement method for bridges using a Scheimpflug camera.
  • To enhance the accuracy and stability of bridge displacement monitoring.

Main Methods:

  • Utilized a Scheimpflug camera, which satisfies the Scheimpflug condition to enlarge DOF without compromising aperture or magnification.
  • Implemented a motion compensation technique tailored to the Scheimpflug camera's unique optical geometry.
Keywords:
Scheimpflug cameracamera motion compensationcomputer visionlow costmulti-point displacement monitoring

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  • Aligned measurement points along the depth direction for clear observation within a single FOV.

    • Main Results:

    • Achieved significant reduction in motion errors: at least 62% in the x-direction and 92% in the y-direction.
    • Demonstrated high consistency between Scheimpflug camera measurements and LiDAR-based measurements.
    • Verified performance through diverse testing settings.

    Conclusions:

    • The proposed Scheimpflug camera-based method offers a cost-effective and stable solution for high-precision, multi-point bridge displacement measurement.
    • The motion compensation technique effectively mitigates errors caused by camera movement.
    • This approach provides a reliable alternative for structural health monitoring of bridges.