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Fractal Analysis Applied to Laser Spot Thermography

In the study presented in this paper, fractal analysis was applied to raw infrared images relative to the nondestructive testing technique of laser spot thermography. Laser pulses were used to impart heat to a composite laminate containing artificial discontinuities. The temperature distribution produced by this thermoelastic excitation was measured with an infrared camera and processed with an algorithm based on fractal analysis. The experimental results were interpreted and compared to simulated images and it was found that the algorithm enabled the detection of damage but was unable to quantify the size of the discontinuity.

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