Thickness identification of nonconductive coatings using terahertz time domain spectroscopy system

Article type: Research Article

Authors: Chady, Tomasz^a; | Gorący, Krzysztof^b

Affiliations: [a] Faculty of Electrical Engineering, West Pomeranian University of Technology, Szczecin, Poland | [b] Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin, Poland

Correspondence: [*] Corresponding author: Tomasz Chady, West Pomeranian University of Technology, Szczecin, Faculty of Electrical Engineering, Sikorskiego 37 St., 70-313 Szczecin, Poland. E-mail: tchady@zut.edu.pl

Abstract: There are many nondestructive methods of coatings evaluation. Only a few of them can be utilized in case of coatings deposited on nonconductive elements. This paper presents application of a terahertz time domain spectroscopy for measuring thickness of thin nonconductive coatings. In order to develop a robust algorithm for thickness identification various experiments were carried out. A metal vessel filled with a small amount of oil was used as the test specimen. Such specimen allows us to easily achieve sample with a variable coating thickness.

Keywords: Non-destructive testing, coatings, terahertz

DOI: 10.3233/JAE-171063

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 59, no. 4, pp. 1511-1517, 2019