Microwave noncontact examination of disbond and thickness variation in stratified composite media

Numerical and experimental results of a microwave noncontact, nondestructive detection and evaluation of disbonds and thickness variations in stratified composite media are presented. The aperture admittance characteristics of a flange mounted rectangular waveguide radiating into a layered, generall...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 1994-03, Vol.42 (3), p.389-395
Main Authors: Bakhtiari, S., Qaddoumi, N., Ganchev, S.I., Zoughi, R.
Format: Article
Language:English
Subjects:
420500 - Engineering- Materials Testing
Admittance
Apertures
Applied sciences
BONDING
Circuit properties
COMPOSITE MATERIALS
DATA
Delamination
Dielectric loss measurement
Electric, optical and optoelectronic circuits
ELECTROMAGNETIC RADIATION
Electronics
ENGINEERING
Exact sciences and technology
EXPERIMENTAL DATA
FABRICATION
FAILURES
Flanges
Fourier transforms
INFORMATION
JOINING
MATERIALS
MATERIALS TESTING
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
MICROWAVE RADIATION
NONDESTRUCTIVE TESTING
NUMERICAL DATA
Plasma applications
Plasma measurements
RADIATIONS
TESTING
THEORETICAL DATA
Waveguide theory
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Summary:Numerical and experimental results of a microwave noncontact, nondestructive detection and evaluation of disbonds and thickness variations in stratified composite media are presented. The aperture admittance characteristics of a flange mounted rectangular waveguide radiating into a layered, generally lossy dielectric media backed or unbacked by a conducting sheet is modeled. The theoretical implementation is based on a Fourier transform boundary matching technique to construct the field components in each medium, coupled with a stationary form of the terminating aperture admittance of the waveguide. The model can serve as a reliable test bed for real-time examination of layered composite media. Experimental results for several cases are presented which show good agreement with the theoretical findings. This is a versatile technique for near-field in situ interrogation of stratified composite media which provides for high resolution measurements.< >
ISSN:0018-9480
1557-9670
DOI:10.1109/22.277431