Defect depth effect on the reflection coefficient of an open-ended coaxial sensor

Auteurs :  H.Amar, H. Ghodbane, M. Amir, T.Bouziane, Z.GUEZOUI, M. Zergoug, Y. Abderrahmane
Année : 2018
Domaine : Electronique
Type : Communication
Conférence: 1st International Conference on Materials Engineering & Science (IConMEAS 2018)
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Mots clés : simulation, Coaxial cable sensor, Defects, HFSS, Realization

Résumé : 

In this paper we present a realization of an open-ended coaxial sensor of internal diameter (2a) and the outer diameter (2b) for the detection of defects in a plate of aluminum, those defects are with deferent depth and created by using electro-erosion technique. Wire with a pressure of the order of μm, the measurements of the reflection coefficients (S11) are carried out using a VNP vector network analyzer. The network analyzer has been calibrated in a frequency band from 200MHz to 20GHz. The AC voltage created between the two conductors generates an electromagnetic field across the internal dielectric. This field extends outside the cylinder to a distance comparable to its diameter 2b, which represents the thickness of the sensor-sensing material in contact with the plate. The waves are subsequently reflected to the inside of a sensor carrying information on the electromagnetic properties of the medium in contact with the sensor opening. Therefore, the sensor provides measurements in reflection mode only, giving the reflection coefficient as a function of the frequency of the waves guided and reflected at the sensor opening. The experimental results were valid in comparison comparing with the found in the literature.