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- Title
Microwave detection of disbonds between an elastomeric specimen and a metal substrate.
- Authors
Sargent, J P
- Abstract
Measurements and predictions of microwave reflectance and phase have been made on defects deliberately introduced at an elastomer/substrate boundary for 25 mm-thick, dielectrically-lossy elastomeric specimens bonded to metal substrates. Measurements were made using both a commercial NDT microwave scanning system operating at 24 GHz and a microwave network analyser between 12 GHz and 19 GHz using open-ended waveguides in contact with the specimen surface and operating in the near field. The method relied on the fact that the specimen was sufficiently uniform in both thickness and microwave properties, such that it did not introduce any additional changes in microwave reflectivity or phase that could obscure changes originating from either the defect or the associated bond line thickness increase. 50 mm- and 25 mm-square, 1 mm- and 0.5 mm-thick defects and associated air leakage areas were detected, whilst 0.2 mm-thick defects were not detected.
- Subjects
ELASTOMERS; METAL bonding; MICROWAVE detectors; WAVEGUIDES; SCANNING systems; SUBSTRATES (Materials science)
- Publication
Insight: Non-Destructive Testing & Condition Monitoring, 2015, Vol 57, Issue 5, p276
- ISSN
1354-2575
- Publication type
Article
- DOI
10.1784/insi.2015.57.5.276