Terahertz Sensor for Non-Contact Thickness and Quality Measurement of Automobile Paints of Varying Complexity
By Ke Su, Yaochun Shen, Axel Zeitler. IEEE Transactions on Terahertz Science and Technology, 2014
137 citations recorded by the source corpus.
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 μm 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.
Subfields: Electrical and Electronic Engineering, Spectroscopy
View Paper: https://www.semanticscholar.org/paper/24c4cf5e5cbcd885460a89bef41115ad5e11b07e
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Citations in the corpus
- Progress in terahertz nondestructive testing: A review (2018, unknown): “Comparison results show that THz has good consistency with the other methods; therefore, THz time-domain systems are ideal for thickness measurements and analysis of layered structures [48].”
- Toward real-time terahertz imaging (2018, background): “density, [127] and porosity [128] of the pharmaceutical tablets, as well as thickness uniformity of automobile exterior coatings [129].”