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

International Conference on Materials Engineering and Science

Amar, H.^1,2 ; Ghodbane, H.^1 ; Amir, M.^3 ; Bouziane, T.^1 ; Younes, A.^2

University Mohamed Khider of Biskra, Algeria^1

Research Center in Industrial Technologies CRTI, P.O. Box 64, Cheraga, Algiers

16014, Algeria^2

University Mouloud Mammeri University of Tizi-Ouzou, Algeria^3

关键词: Detection of defects;    Electromagnetic properties;    Internal diameters;    Measurements of;    Open-ended coaxial sensors;    Reflection modes;    Sensing material;    Vector network analyzers;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/454/1/012072/pdf
DOI  :  10.1088/1757-899X/454/1/012072

来源: IOP

【 摘 要 】

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.