Title :
A method for evaluating the dielectric properties of composites using a combined embedded modulated scattering and near-field microwave nondestructive testing technique
Author :
Hughes, Dana ; Zoughi, Reza
Author_Institution :
Dept. of Electr. & Comput. Eng., Missouri Univ., Rolla, MO, USA
Abstract :
Investigation into the derivation of the dielectric property of a material with an embedded modulated PIN diode-loaded dipole is described, using an open-ended rectangular waveguide as the irradiating source. Previous measurements of the curing of a mortar specimen show the sensitivity of this combined technique and its potential for inspecting composite structures. Modification of previous algorithms for back calculating the dielectric properties of a material with a conductor backing is considered. The modification would involve replacing the reflection at the conductor with the reflection at a modulated dipole antenna. For this, comparisons between the reflection coefficients of the dipole antenna and an infinite conducting plate are made. These results are analyzed, and the necessary considerations are discussed
Keywords :
composite materials; dielectric measurement; dielectric properties; electromagnetic wave scattering; microwave measurement; nondestructive testing; composites; conductor backing; dielectric properties; embedded modulated PIN diode-loaded dipole; embedded modulated scattering; microwave nondestructive testing; near-field microwave NDT technique; open-ended rectangular waveguide; reflection coefficients; sensitivity; Conducting materials; Curing; Dielectric materials; Dielectric measurements; Diodes; Dipole antennas; Mortar; Rectangular waveguides; Reflection; Reflector antennas;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2001. IMTC 2001. Proceedings of the 18th IEEE
Conference_Location :
Budapest
Print_ISBN :
0-7803-6646-8
DOI :
10.1109/IMTC.2001.929528
