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Comparison of Depth Camera and Terrestrial Laser Scanner in Monitoring Structural Deflections.

Michael Bekele Maru1, Donghwan Lee2, Kassahun Demissie Tola1

  • 1Department of the Civil, Architectural and Environmental System Engineering, Sungkyunkwan University, Suwon 16419, Korea.

Sensors (Basel, Switzerland)
|January 5, 2021
PubMed
Summary
This summary is machine-generated.

This study compared depth cameras (DC) and terrestrial laser scanners (TLS) for structural deflection monitoring. Both sensors are viable for deflections above 3 mm, with TLS offering superior accuracy in structural health monitoring.

Keywords:
bilateral filteringdeflectiondepth camera (DC)hausdorff distancepoint cloudterrestrial laser scanning (TLS)

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Area of Science:

  • Structural Engineering
  • Geomatics
  • Sensor Technology

Background:

  • Three-dimensional (3D) modeling aids in understanding structural behavior under stress.
  • 3D point clouds, generated via Light Detection and Ranging (LiDAR) and 3D cameras, are key for analyzing structural changes.
  • Optical sensors offer non-contact methods for structural health monitoring.

Purpose of the Study:

  • To evaluate and compare the performance of a depth camera (DC) and a terrestrial laser scanner (TLS) for estimating structural deflection.
  • To assess the effectiveness of bilateral filtering techniques in enhancing point cloud data accuracy for structural monitoring.
  • To validate sensor outputs against a linear variable differential transformer (LVDT) for reliable structural health assessment.

Main Methods:

  • Acquisition of 3D point cloud data using a depth camera (DC) and a terrestrial laser scanner (TLS).
  • Application of bilateral filtering techniques to enhance the accuracy of point cloud datasets.
  • Experimental validation using a linear variable differential transformer (LVDT) sensor during indoor structural deflection tests.

Main Results:

  • Both DC and TLS datasets demonstrated acceptable performance for nominal deflections of 3 mm and above, with errors less than ±10%.
  • Terrestrial laser scanner (TLS) provided more accurate results compared to the depth camera (DC).
  • Bilateral filtering improved the accuracy and application potential of optical sensors in structural health monitoring.

Conclusions:

  • Depth cameras and terrestrial laser scanners are suitable optical sensors for structural deflection estimation in health monitoring.
  • TLS generally outperforms DC in accuracy for structural deflection measurements.
  • Enhanced point cloud data through filtering broadens the scope of optical sensors for precise structural analysis.