Design and optimization of a microfluidic-based inductor used as a multifunction-sensor

Nizar Habbachi, Hatem Boussetta, Mohamed Adel Kallala, Kamel Besbes


A planar miniaturized inductor has been designed in order to realize some transduction functions linked to the presence of fluids. Its electrical behaviour has been studied for two liquids: Galinstan and salted water. Their presence between metallic armatures modifies the inductance value at a nominal frequency, chosen at 2GHz. By using a FEM software, the spatial distributions of magnetic field and surface current density in the entire device have been modelized for six arbitrary positions of these liquids in inductor microchannels. The geometrical aspects of the device have been studied and their influence examined for each liquid.  We show that the inductor performances are influenced by the spiral width variations and the inter-turn distances of the coil. Considering the device as a sensor, we have evaluated the variations of two parameters: inductance and quality factors, which can respectively attain 664% (for gallistan) and 175% (for salted water) from their nominal values.


Variable inductor ; sensor; micro-fluids;

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