Microwave imaging and defectoscopy are promising techniques for dielectric composite evaluation. Their most significant advantage is their relatively high penetration depth. Another feature worth noting is that traditional methods could not acquire an internal content with such a low impact on both the sample and surrounding environment, including the test operator, compared to other techniques. This paper presents microwave non-destructive and noninvasive methods for quality evaluation of layered composite materials using an open-ended waveguide probe. Pure |S₁₁| parameters only exceptionally give a clear answer about the location of material cracks. Therefore, this makes it necessary to analyze these parameters simultaneously along with several other factors, such as stand-off distance, probe type or wave polarization. The purpose of the work was to find the dependency between the physical state of a layered composite powerplant pipeline and the S-matrix parameters response (reflection and transmission parameters) in a Ku frequency band that has not yet been extensively researched. Lower-frequency measurements broaden the application possibility for thicker composites, mainly because of a higher penetration depth and measurement setup availability. Different methods have been shown, including reflection and transmission/reflection methods, both in close proximity and in stand-off distance. The measurements are based on a low-complexity experimental setup.

This paper is a short description of microwave non-destructive testing methods for composite material and presentation of a simple broadband microwave test method with an open-ended waveguide antenna for the purpose of non-destructive testing and quality evaluation of layered composite materials. Low-complexity experimental setup is shown. Research is aimed to determine the physical state of layered composite material especially in industrial pipelines. The overall applicability of the proposed system for detection purpose is demonstrated with use of experimental results. Suggestions for future researches is the need to develop more sophisticated waveguides systems to increase the scan resolution.

Rozdzielczość obrazowania konwencjonalnych sond pola bliskiego jest ściśle związana z rozmiarami jej apertury. Osiągnięcie wysokiej rozdzielczości obrazu najczęściej wymaga operowania na bardzo wysokich częstotliwościach. W niniejszej pracy przedstawiono sondy oparte o struktury dzielonych rezonatorów pierścieniowych, które odpowiednio wykorzystane zapewniają wysoką rozdzielczość i czułość przy zachowaniu niskiego pasma pracy. Prace wykonano na przykładzie detekcji wad podpowierzchniowych w materiale kompozytowym – fragment zbiornika (GFRP) do przechowywania wodoru.

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