Abstract:
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 an...Show MoreMetadata
Abstract:
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.
Published in: IEEE Transactions on Terahertz Science and Technology ( Volume: 4, Issue: 4, July 2014)
Funding Agency:
Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, U.K.
Ke Su received the B.S. degree in applied physics from the University of Zhengzhou, China, in 2003, the M.S. degree in material science from Fudan University, China, in 2006, and the Ph.D. degree in applied physics from New Jersey Institute of Technology, Newark, NJ, USA, in 2011. Her doctoral research concerned Terahertz communication and Terahertz synthetic aperture imaging.
She is currently a Research Associate in the T...Show More
Ke Su received the B.S. degree in applied physics from the University of Zhengzhou, China, in 2003, the M.S. degree in material science from Fudan University, China, in 2006, and the Ph.D. degree in applied physics from New Jersey Institute of Technology, Newark, NJ, USA, in 2011. Her doctoral research concerned Terahertz communication and Terahertz synthetic aperture imaging.
She is currently a Research Associate in the T...View more
Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool, U.K.
Yao-Chun Shen is a Senior Lecturer at the Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool, U.K., since June 2007. Before that he has worked on terahertz-related technology for many years, first as a Research Associate at the Cavendish Laboratory, University of Cambridge, Cambridge, U.K., and then as a Senior Scientist at TeraView Limited, Cambridge, U.K. He has been awarded seven t...Show More
Yao-Chun Shen is a Senior Lecturer at the Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool, U.K., since June 2007. Before that he has worked on terahertz-related technology for many years, first as a Research Associate at the Cavendish Laboratory, University of Cambridge, Cambridge, U.K., and then as a Senior Scientist at TeraView Limited, Cambridge, U.K. He has been awarded seven t...View more
Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, U.K.
J. Axel Zeitler received the undergraduate degree from the University of WuIrzburg, Germany, and the Ph.D. degree from the University of Otago, New Zealand.
He is a University Lecturer at the Department of Chemical Engineering and Biotechnology, University of Cambridge, U.K., where he leads the Terahertz Applications Group. He is a Fellow at Gonville and Caius College, where he was a Research Fellow prior to his current ap...Show More
J. Axel Zeitler received the undergraduate degree from the University of WuIrzburg, Germany, and the Ph.D. degree from the University of Otago, New Zealand.
He is a University Lecturer at the Department of Chemical Engineering and Biotechnology, University of Cambridge, U.K., where he leads the Terahertz Applications Group. He is a Fellow at Gonville and Caius College, where he was a Research Fellow prior to his current ap...View more
Contents Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, U.K.
Ke Su received the B.S. degree in applied physics from the University of Zhengzhou, China, in 2003, the M.S. degree in material science from Fudan University, China, in 2006, and the Ph.D. degree in applied physics from New Jersey Institute of Technology, Newark, NJ, USA, in 2011. Her doctoral research concerned Terahertz communication and Terahertz synthetic aperture imaging.
She is currently a Research Associate in the Terahertz Applications Group at the University of Cambridge, Cambridge, U.K. Her research interests include THz application on coating measurement, THz imaging and THz spectroscopy.
Ke Su received the B.S. degree in applied physics from the University of Zhengzhou, China, in 2003, the M.S. degree in material science from Fudan University, China, in 2006, and the Ph.D. degree in applied physics from New Jersey Institute of Technology, Newark, NJ, USA, in 2011. Her doctoral research concerned Terahertz communication and Terahertz synthetic aperture imaging.
She is currently a Research Associate in the Terahertz Applications Group at the University of Cambridge, Cambridge, U.K. Her research interests include THz application on coating measurement, THz imaging and THz spectroscopy.View more
Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool, U.K.
Yao-Chun Shen is a Senior Lecturer at the Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool, U.K., since June 2007. Before that he has worked on terahertz-related technology for many years, first as a Research Associate at the Cavendish Laboratory, University of Cambridge, Cambridge, U.K., and then as a Senior Scientist at TeraView Limited, Cambridge, U.K. He has been awarded seven terahertz-related patents, and published over 80 peer-reviewed journal papers that are highly cited with an h-index of 23. His current research interests include the development of novel terahertz devices and imaging techniques and, in particular, its industrial applications
Yao-Chun Shen is a Senior Lecturer at the Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool, U.K., since June 2007. Before that he has worked on terahertz-related technology for many years, first as a Research Associate at the Cavendish Laboratory, University of Cambridge, Cambridge, U.K., and then as a Senior Scientist at TeraView Limited, Cambridge, U.K. He has been awarded seven terahertz-related patents, and published over 80 peer-reviewed journal papers that are highly cited with an h-index of 23. His current research interests include the development of novel terahertz devices and imaging techniques and, in particular, its industrial applicationsView more
Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, U.K.
J. Axel Zeitler received the undergraduate degree from the University of WuIrzburg, Germany, and the Ph.D. degree from the University of Otago, New Zealand.
He is a University Lecturer at the Department of Chemical Engineering and Biotechnology, University of Cambridge, U.K., where he leads the Terahertz Applications Group. He is a Fellow at Gonville and Caius College, where he was a Research Fellow prior to his current appointment. In addition to his university position, he holds a College Lectureship in Chemical Engineering, as well as in Chemistry. He has held research positions at the Cavendish Laboratory, University of Cambridge, U.K., and TeraView Ltd., Cambridge, U.K.
J. Axel Zeitler received the undergraduate degree from the University of WuIrzburg, Germany, and the Ph.D. degree from the University of Otago, New Zealand.
He is a University Lecturer at the Department of Chemical Engineering and Biotechnology, University of Cambridge, U.K., where he leads the Terahertz Applications Group. He is a Fellow at Gonville and Caius College, where he was a Research Fellow prior to his current appointment. In addition to his university position, he holds a College Lectureship in Chemical Engineering, as well as in Chemistry. He has held research positions at the Cavendish Laboratory, University of Cambridge, U.K., and TeraView Ltd., Cambridge, U.K.View more