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Detection of Defects in Geomembranes Using Quasi-Active Infrared Thermography.

Yue Ma1, Francis Rose2, Leslie Wong1

  • 1Department of Mechanical and Aerospace Engineering, Monash University, Wellington Rd, Clayton, VIC 3800, Australia.

Sensors (Basel, Switzerland)
|August 28, 2021
PubMed
Summary

This study introduces a new quasi-active thermography method to find subsurface defects in large polyethylene geomembranes used in sewage treatment. Combining three analysis algorithms effectively detects defects and identifies underlying materials.

Keywords:
HDPE geomembranedefect detectionfloating coversnon-contact inspectionquasi-active thermographythermal image processing

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Area of Science:

  • Geotechnical Engineering
  • Non-Destructive Testing
  • Environmental Engineering

Background:

  • High-density polyethylene geomembranes are crucial for biogas harvesting in sewage treatment lagoons.
  • Inspecting large geomembranes for subsurface defects is challenging due to size and varying substrate contact (liquid sewage, scum, biogas).

Purpose of the Study:

  • To present and evaluate a novel quasi-active thermography method for subsurface defect detection in geomembranes.
  • To assess the effectiveness of different thermal transient analysis algorithms for this application.

Main Methods:

  • Utilized ambient sunlight as the thermal energy source and cloud shading as the transient trigger.
  • Conducted outdoor laboratory-scale experiments measuring solar radiation (pyranometer) and geomembrane surface temperature (infrared camera).
  • Analyzed thermal transient data using three algorithms: Newton's law of cooling, logarithmic second derivative peak, and frame subtraction.

Main Results:

  • Each of the three analysis algorithms demonstrated limitations individually.
  • The combined application of the three algorithms successfully distinguished between different underlying substrates.
  • The integrated approach proved effective in determining the presence of subsurface defects within the geomembrane.

Conclusions:

  • Quasi-active thermography, using natural thermal transients, is a viable method for geomembrane inspection.
  • Combining multiple thermal analysis algorithms enhances defect detection and substrate identification capabilities.
  • This technique offers a promising solution for non-destructive evaluation of large-scale geomembranes in environmental applications.