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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
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JoVE Journal Engineering
Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

DOI:
10.3791/55733-v

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11:34 min

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May 15, 2017

•

,
1Department for Non-Destructive Testing, Thermographic Methods,Bundesanstalt für Materialforschung und -prüfung (BAM)

Chapters

  • 00:05Title
  • 00:45The Laser Projected Photothermal Thermography (LPPT) Setup
  • 04:33Set Up the Camera Control and Perform the Experiment
  • 07:43Post-process the Data and Extract Temperature Information
  • 08:41Results: Defects Identified in a Steel Test Sample
  • 10:03Conclusion

Summary

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This method aims at locating vertical subsurface defects. Here, we couple a laser with a spatial light modulator and trigger its video input to heat a sample surface deterministically with two anti-phased modulated lines while acquiring highly resolved thermal images. The defect position is retrieved from evaluating thermal wave interference minima.

Tags

Subsurface DefectLaser Projected Photothermal ThermographyStructured HeatingThermal ImagingNon-destructive TestingPerpendicularly Oriented DefectsThermal Wave FieldsLaser FiberPower MeterProjectorTranslation StageInfrared PhotographyGold Mirror

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