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The paper reports on the implementation of an inductive RF sensing technique dedicated to the non-contact evaluation of the dielectric properties of organic materials. The technique lies on the use of a high quality-factor RF resonator, electromagnetically coupled to the material under evaluation, and distantly monitored by an RF bobbin coil connected to a network analyzer. A lumped element electrical model of the set-up is proposed and used to estimate the complex permittivity of the material, starting from the complex impedance read out at the ends of the monitoring coil. The contactless measurement technique is implemented for the dielectric monitoring of yogurts during their gelation process. Results obtained under various operating conditions and yogurt preparation parameters are discussed and compared with results obtained with a conventional open ended coaxial contact probe. The obtained preliminary results open the way to the development of easy-to-implement and non-invasive dielectric monitoring techniques of organic materials, with many prospects in agrifood as well as health monitoring applications.
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