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Compensation-Based Full-Filed Thermal Homogenization for Contrast Enhancement in Long Pulse Thermographic Imaging.

Yoonjae Chung1, Chunyoung Kim2, Seongmin Kang2

  • 1Eco-Sustainable Energy Research Institute, Kongju National University, 1223-24 Cheonan-daero, Seobuk-gu, Cheonan-si 31080, Republic of Korea.

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Summary

This study introduces an advanced thermographic inspection technique using a halogen array lamp and compensation methods to improve subsurface defect detection. The enhanced signal-to-noise ratio allows for more accurate defect sizing in industrial components.

Keywords:
active thermographic testingcompensation methoddefect detectabilitylong pulse thermographynon-destructive testingthermographic image

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Area of Science:

  • Materials Science
  • Engineering
  • Non-Destructive Testing

Background:

  • Non-destructive testing (NDT) is vital for industrial safety.
  • Long pulse thermography (LPT) is effective for subsurface defect detection.
  • Non-uniform excitation and noise limit LPT accuracy.

Purpose of the Study:

  • To enhance defect detection reliability in thermographic inspection.
  • To develop compensation methods for non-uniform thermal loads.
  • To improve signal-to-noise ratio (SNR) and defect sizing accuracy.

Main Methods:

  • Utilized a halogen array (HA) lamp for thermal excitation.
  • Implemented absolute temperature compensation (ATC) and temperature rate compensation (TRC).
  • Validated the technique on mock-up specimens with artificial subsurface defects.

Main Results:

  • Achieved significant SNR enhancement, up to 42 dB for severe defects.
  • Demonstrated improved defect contrast and detection reliability.
  • Enabled accurate defect sizing using SNR-based estimation models.

Conclusions:

  • The proposed thermographic inspection technique enhances defect detection and sizing.
  • Compensation methods effectively address non-uniform thermal loads and noise.
  • Direct defect assessment from temperature thermograms is possible, simplifying analysis.