Istituto di Scienza e Tecnologie dell'Informazione     
Bramanti M. A slot line microwave dielectric permittivity sensor for measure and control of laminated materials. In: The journal of Microwave Power & Electromagnetic Energy, vol. 26 (2) pp. 67 - 71. International Microwave Power Institute, 1991.
Measuring dielectric permittivity is a common technique to characterize malerials which, sometimes, allows also a non-destructive detection of interesting physical properties of objects and systems. A dielectric permittivity sensor far microwave frequency range is proposed, based on a slot line resonator loaded by the material under test which appears particularly suited for characterization of laminated type dielectric materials. The experimentally measured sensitivity resulted about 160 MHz/unit of ɛ∇r. Some results on the use of the sensor to detect air gaps inside dielectric materials are also reported.
Subject Microwave sensors
Dielectric measurements
Non-invasive measurements

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