Bimodal microwave method for thickness estimation of surface coatings on polymer composites

Li, Zhen, Meng, Zhaozong, Soutis, Constantinos, Haigh, Arthur, Wang, Ping and Gibson, Andrew ORCID: https://orcid.org/0000-0003-2874-5816 (2022) Bimodal microwave method for thickness estimation of surface coatings on polymer composites. Advanced Engineering Materials, 24 (5). p. 2100494. ISSN 1438-1656

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Abstract

Two new microwave sensors, an open cylindrical cavity resonator with a T-shaped excitation element and a flanged coaxial line sensor, are used for the nondestructive thickness measurement of surface coatings on a unidirectional carbon fiber-reinforced polymer (CFRP) laminate. Both sensors are found insensitive to the anisotropy of the composite substrate, offering easy implementation. Three commercially available plastic films, polyethylene (PE), polyethylene terephthalate (PET), and polyvinyl chloride (PVC), are used to simulate the coating. In the setup, the microwave sensors are directly mounted on the 4 mm-thick composite plate. The coating affects the surface impedance of the composite, causing changes to the signal reflection. Calibration is performed by the measurement of samples with known coating thicknesses. For the cavity resonator, a linear relationship is obtained between the resonance frequency shift and the thickness; the difference between the measured and actual thickness values is around 17 μm. For the coaxial line sensor, the phase variation increases with increasing thickness. For both sensors used, the estimation error for a coating thickness in the region of 200 μm can be well within 10%.

Item Type:	Article
Peer-reviewed:	Yes
Date Deposited:	15 Jun 2022 13:15
Publisher:	Wiley
Additional Information:	This is the peer reviewed version of the following article: Li, Z., Meng, Z., Soutis, C., Haigh, A., Wang, P. and Gibson, A. (2022), Bimodal Microwave Method for Thickness Estimation of Surface Coatings on Polymer Composites. Adv. Eng. Mater., 24: 2100494., which has been published in final form at https://doi.org/10.1002/adem.202100494. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
Divisions:	Faculties > Science and Engineering
Subject terms:	0912 Materials Engineering, Materials
URI:	https://e-space.mmu.ac.uk/id/eprint/629881
DOI:	https://doi.org/10.1002/adem.202100494
ISSN	1438-1656
e-ISSN	1527-2648

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