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Microwave Non-Destructive Testing for Delamination Detection in Layered Composite Pipelines.
Przemysław Sobkiewicz1, Paweł Bieńkowski1, Wojciech Błażejewski2
1Department of Telecommunications and Teleinformatics, Wroclaw University of Science and Technology, Janiszewskiego 9, 50-370 Wroclaw, Poland.
Sensors (Basel, Switzerland)
|July 2, 2021
Summary
This study explores microwave imaging for evaluating dielectric composite materials, offering non-destructive internal inspection. Researchers analyzed S-matrix parameters to detect defects in composite pipelines.
Area of Science:
- Materials Science
- Electromagnetics
- Non-Destructive Testing
Background:
- Microwave imaging and defectoscopy offer high penetration depth for dielectric composite evaluation.
- Traditional methods lack the non-invasive, low-impact internal assessment capabilities of microwave techniques.
- Existing methods often struggle to pinpoint internal material defects solely using S11 parameters.
Purpose of the Study:
- To investigate the relationship between the physical state of layered composite powerplant pipelines and S-matrix parameters.
- To explore the under-researched Ku frequency band for composite material analysis.
- To establish non-destructive, non-invasive quality evaluation methods for layered composites.
Main Methods:
- Utilized an open-ended waveguide probe for microwave non-destructive and non-invasive testing.
- Analyzed S-matrix parameters (reflection and transmission) in the Ku frequency band.
- Investigated various factors including stand-off distance, probe type, and wave polarization.
Main Results:
- Pure |S11| parameters alone are insufficient for accurate defect localization.
- Simultaneous analysis of multiple parameters and factors is crucial for effective defect detection.
- The study demonstrates the feasibility of using microwave reflection and transmission methods for composite evaluation.
Conclusions:
- Microwave techniques provide a viable non-destructive method for assessing the internal quality of composite materials.
- Analyzing S-matrix parameters in the Ku band offers new insights into composite defect detection.
- The developed low-complexity experimental setup enables effective evaluation of layered composites.
