Terahertz Sensor for Non-Contact Thickness and Quality Measurement of Automobile Paints of Varying Complexity
Terahertz Sensor for Non-Contact Thickness and Quality Measurement of Automobile Paints of Varying Complexity
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DOI：
10.1109/tthz.2014.2325393
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发表时间：
2014-07-01
影响因子：
3.2
通讯作者：
Zeitler, J. Axel
中科院分区：
文献类型：
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作者：
Su, Ke;Shen, Yao-Chun;Zeitler, J. Axel
在本文中，我们建议使用太赫兹脉冲成像（TPI）作为一种新的工具来测量的厚度和质量的四层汽车油漆的金属和非金属基板。使用严格的一维电磁模型的太赫兹在多层介质中的传播与数值拟合方法相结合，折射率，消光系数，和厚度的个别油漆层进行了测定。这种方法被证明是能够解决涂层的厚度为18米，并验证了单层和多层汽车油漆样品。太赫兹测量的结果与汽车制造过程中目前用于无损检测的其他技术进行了基准测试：超声和涡流测量，以及两种参考技术，X射线微计算机断层扫描和表面轮廓测量。在技术之间发现了良好的一致性。与传统技术相比，TPI的优点在于它是一种非接触方法，并且能够通过二维映射在空间上解析厚度均匀性分布信息。
In this paper, we propose to use terahertz pulsed imaging (TPI) as a novel tool to measure the thickness and quality of up to four layers of car paint on both metallic and non-metallic substrates. Using a rigorous one-dimensional electromagnetic model for terahertz propagation in a multi-layered medium combined with a numerical fitting method, the refractive index, extinction coefficient, and thickness of individual paint layers were determined. This proposed method was shown to be able to resolve coating layers down to a thickness of 18 m and was validated for both single-and multi-layer automobile paint samples. Results of the terahertz measurements were benchmarked against other techniques that are currently used for non-destructive testing during car manufacture: ultrasound and eddy current measurements, as well as two reference techniques, X-ray microcomputed tomography and surface profilometry. Good consistency was found between the techniques. Compared to conventional techniques, TPI has the advantage that it is a non-contact method and that it is able to spatially resolve the thickness uniformity distribution information by two-dimensional mapping.