Nondestructive Testing of Dielectric Materials using
an Active Reflecting Microwave Array
Publication: Publication Date: 1 December 2016Testing Method:
Microwave testing of dielectric materials has
recently become an increasingly important field.
Dielectric materials such as composites are
preferred over metallic counterparts, due to their
light weight and superior strength. Because of the
exponential growth in the use of such materials, a
reliable method for testing is vital. This paper
presents a novel microwave imaging system for
the nondestructive detection of anomalies in
dielectric materials. The system utilizes an active
beam steering array that scans a wide circular
sector of 150° where dielectric targets are positioned.
The scattered field, measured on the arc of
the sector, was used for image reconstruction and
discontinuity detection by means of time reversal
signal processing. Two types of anomalies are
considered in the paper: discontinuities and
metallic impurities. Experimental results of
detecting these anomalies within dielectric
samples are presented.
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