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A cost-effective alternative for chessboard pattern to calibrate industrial infrared cameras used in defect measurement with active lock-in thermography

: Fonseca de Oliveira, Bernardo Cassimiro; Seibert, Artur Antonio; Winands, Kai; Sá Brant, Marina de; Bortoli, Tiago Junior de; Baldo, Christian Raffaelo; Gonçalves, Albertazzi Júnior


Sood, Ashok K. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Infrared Sensors, Devices, and Applications X : August 24 - 4 September, 2020, Online Only, United States
Bellingham, WA: SPIE, 2020 (Proceedings of SPIE 11503)
ISBN: 978-1-5106-3812-9
ISBN: 978-1-5106-3813-6
Paper 115030T, 11 S.
Conference "Infrared Sensors, Devices, and Applications" <10, 2020, Online>
Fraunhofer IPT ()
industrial non-destructive testing; camera calibration; infrared-sensitive chessboard pattern; laser ablation; active lock-in thermography

Image-based industrial non-destructive testing techniques are commonly used for assessing material integrity. The cameras used for these tasks have lenses that can present form deviations, promoting anomaly creation on the acquired images. This problem also affects infrared cameras, but very often nothing is done to correct it, usually due to the cost of calibration tools for infrared wavelength. This paper describes then a manufacturing process based on the ablation of copper material with a pulsed laser of a cost-effective, infrared-reflective chessboard pattern for calibrating infrared cameras. Measurements of artificial defects in carbon fiber reinforced plastic plates with active lock-in thermography were performed and a comparison between the results with and without the corrections given by the calibration was done. The metrological benefits of applying the proposed calibration procedure have been evidenced by the reduction of the measurement bias and repeatability, which is important especially considering industrial non-destructive testing evaluations.