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Microwave detection optimization of disbond in layered dielectrics with varying thickness

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4 Author(s)
Ganchev, S.I. ; Appl. Microwave Nondestructive Testing Lab., Colorado State Univ., Fort Collins, CO, USA ; Qaddoumi, N. ; Ranu, E. ; Zoughi, R.

The detection sensitivity optimization of air disbond in layered dielectric composites, using an open-ended rectangular waveguide, is studied both theoretically and experimentally. The sensitivity of the disbond detection is strongly influenced by the proper choice of parameters such as the operating frequency and the layered composite geometry (conductor hacked or terminated by an infinite half-space of air). The capability of optimizing the measurement system parameters to detect and estimate the thickness of a disbonded layer independent of some changes in the thickness of the dielectric coating is also demonstrated. The impact of the parameters influencing detection optimization is theoretically investigated and then experimentally verified

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Instrumentation and Measurement, IEEE Transactions on  (Volume:44 ,  Issue: 2 )