A cost-effective alternative for chessboard pattern to calibrate industrial infrared cameras used in defect measurement with active lock-in thermography
A cost-effective alternative for chessboard pattern to calibrate industrial infrared cameras used in defect measurement with active lock-in thermography
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DOI：
10.1117/12.2566822
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发表时间：
2020-08
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通讯作者：
Bernardo Cassimiro Fonseca de Oliveira;Artur Antonio Seibert;K. Winands;Marina de Sá Brant;Tiago Júnior de Bortoli;Crhistian Raffaelo Baldo;Armando Albertazzi Gonçalves Júnior
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作者：
Bernardo Cassimiro Fonseca de Oliveira;Artur Antonio Seibert;K. Winands;Marina de Sá Brant;Tiago Júnior de Bortoli;Crhistian Raffaelo Baldo;Armando Albertazzi Gonçalves Júnior
基于图像的工业无损检测技术通常用于评估材料完整性。用于这些任务的相机具有可以呈现形状偏差的镜头，从而促进在所获取的图像上产生异常。这个问题也会影响红外摄像机，但通常没有采取任何措施来纠正它，这通常是由于红外波长校准工具的成本。本文描述了一种基于用脉冲激光烧蚀铜材料的制造工艺，该工艺具有成本效益，红外反射棋盘图案用于校准红外相机。采用主动锁相热成像技术对碳纤维增强塑料板中的人工缺陷进行了测量，并对有无校正的结果进行了比较。应用所提出的校准程序的好处已被证明的测量偏差和可重复性，这是非常重要的，特别是考虑到工业无损检测评估的减少。
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.