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.
SunY.SyM.Y.WangY.-X.J.AhujaA.T.ZhangY.-T. and Pickwell-MacPhersonE., A promising diagnostic method: Terahertz pulsed imaging and spectroscopy, World Journal of Radiology3(3) (2011), 55–65, doi:10.4329/wjr.v3.i3.55.
2.
ChadyT.GorącyK.ŁopatoP.PilawkaR. and BaniukiewiczP., THz imaging based catalog of composite materials defects, in: Review of Progress in Quantitative Nondestructive Evaluation: Vol. 31, AIP Conference Proceedings, Vol. 1430, Issue 1, pp. 1110–1117.
3.
ShonC.H.ChongW.Y.JeonS.G.KimG.J.KimJ.I. and JinY.S., High speed terahertz pulse imaging in the reflection geometry and image quality enhancement by digital image processing, International Journal of Infrared and Millimeter Waves29 (2008), 79–88.
4.
HaykinS.S. and WidrowB., Least-Mean-Square Adaptive Filters, Wiley, 2003 (eds) , ISBN 0-471-21570-8.
