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Enhanced sensitivity of microwave inspection of thin composites at resonance
Balamurugan T. Sivaprakasam, ,
Published in Institute of Electrical and Electronics Engineers Inc.
2019
Abstract
In this paper, the resonance behavior of layered dielectric media is exploited for microwave non-destructive testing (NDT) of thin composite. Ultra wide band excitation over 1-20 GHz coupled to the composite using open ended coaxial probe was used to identify sample resonance in the absence of the defect. The time gated reflection coefficient (S11) of the sample measured at resonance was used to record the spatial variation in S11 for an insert with low dielectric contrast embedded in the thin composite. The proposed technique was validated using 3.5 mm thick glass fiber epoxy composite of 6 layers for 10 mm x 10 mm x 0. 4 mm inclusion with low dielectric contrast (| A e r | < 2) in between the composite layers. The measurements indicate enhanced sensitivity for the low dielectric contrast at sample resonance which is lost when inspected off resonance in agreement with the simulations. © 2019 URSI. All rights reserved.
About the journal
JournalData powered by Typeset2019 URSI Asia-Pacific Radio Science Conference, AP-RASC 2019
PublisherData powered by TypesetInstitute of Electrical and Electronics Engineers Inc.
Open AccessNo
Concepts (12)
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    Composite materials
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    Probes
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    Resonance
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    COAXIAL PROBE
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    COMPOSITE LAYER
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    Enhanced sensitivity
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    FIBER-EPOXY COMPOSITES
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    Layered dielectrics
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    MICROWAVE NON-DESTRUCTIVE TESTING
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    OPEN-ENDED COAXIAL PROBE
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    Spatial variations
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    Nondestructive examination