Accurate thickness measurement of multiple coating layers on carbon fiber composites using microwave cavity perturbation

Li, Z, Wu, C, Meng, Z, Soutis, C, Chen, Z, Wang, P and Gibson, A ORCID: https://orcid.org/0000-0003-2874-5816 (2022) Accurate thickness measurement of multiple coating layers on carbon fiber composites using microwave cavity perturbation. IEEE Transactions on Instrumentation and Measurement, 71. p. 8000410. ISSN 0018-9456

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Official URL: https://ieeexplore.ieee.org/document/9694605

Abstract

Current techniques for evaluating the multilayered coating thickness on carbon fiber-reinforced polymer composites are suboptimal; here, we present a new nondestructive microwave method using an open cavity resonator sensor. When the open end of the cavity is positioned on a conductive polymer composite, a resonant cavity is formed. The coating perturbs the surface impedance, causing a resonance frequency shift. In the modeling, the original endplate perturbation theory for a closed resonant cavity is modified, incorporating the effect of the coating. One-, two- and multilayered coating cases are studied, and a linear relationship is revealed between the resonance frequency shift and the coating thickness change. The accuracy of the model is confirmed by electromagnetic simulation performed with CST software and actual measurements. It is shown that the proposed sensor is insensitive to the conductivity anisotropy of the composite examined, offering easy implementation. For the coating thickness estimation, errors within ±5% have been observed, where two reference cases are used as a simple form of calibration. The method presented here offers efficient on-site evaluation of coatings on composite structures of aircraft and other applications.

Item Type:	Article
Peer-reviewed:	Yes
Date Deposited:	27 May 2022 07:51
Publisher:	Institute of Electrical and Electronics Engineers
Additional Information:	This is an Author Accepted Manuscript of an article published in IEEE Transactions on Instrumentation and Measurement, by IEEE. © 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Divisions:	Faculties > Science and Engineering
Subject terms:	0299 Other Physical Sciences, 0906 Electrical and Electronic Engineering, Electrical & Electronic Engineering
URI:	https://e-space.mmu.ac.uk/id/eprint/629799
DOI:	https://doi.org/10.1109/TIM.2022.3146907
ISSN	0018-9456
e-ISSN	1557-9662

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