Abstract
Abstract
In this paper, a comparative study between two open ended coaxial sensors with and without cavity is presented. Those sensors are used for materials characterization (composite, dielectric, liquid) and surface defects detection. First Galerkin’s method in the Fourier transform domain is applied to the determination of the resonant frequencies of an open-ended coaxial sensor. The obtained results are used for the realization of two open ended coaxial sensors with and without cavity. The defects detection testbed includes a network analyzer, two open ended coaxial sensors and two aluminum plates with defects of various depths. The proposed method is based on the reflected electromagnetic waves from defected surface, wish are captured by a coaxial sensor. The behavior of the sensor is then studied through reflection coefficient measurements for each kind of defect. A comparative study between the realized sensors is also carried out.