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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
 

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Article DOI: 10.3791/55733-v • 11:34 min • May 15th, 2017
May 15th, 2017 •
1, 1
1Department for Non-Destructive Testing, Thermographic Methods, Bundesanstalt für Materialforschung und -prüfung (BAM)

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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.

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Subsurface Defect Localization Structured Heating Laser Projected Photothermal Thermography Non-destructive Testing Non-contact Inspection Thermal Imaging Perpendicularly Oriented Defects Thermal Wave Fields Laser Source Telescope Beam Sampler Power Meter Head Projector Development Kit Collimation
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