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Article Dans Une Revue Sensors and Actuators A: Physical Année : 2015

Microwave/microfluidic sensor fabricated on a flexible kapton substrate for complex permittivity characterization of liquids

Résumé

A low cost and sensitive microfluidic sensor operating in X-band is proposed and validated. This sensor consists of multiple-stubs coupled to microstrip line and it is dedicated to liquid characterization with perspectives for chemistry and biology. Such device is fabricated using printing technologies on a flexible kapton substrate. The complex permittivity of water-NaCl solutions prepared in different concentrations is estimated by using equations that relate the resonance characteristics and the difference of complex permittivity between the tested sample and the reference one. The calculated values of the real and imaginary parts of the complex permittivity show linear variation as function of the water-NaCl concentrations. For the real part, two linear zones are defined, one for the lower concentrations (<0.5 mol/L) and the second one for the higher concentrations (>0.5 mol/L). However, for the imaginary part, only one linear region is obtained for the concentrations investigated. Good agreement is observed between the results obtained from Cole-Cole model and the estimated values retrieved from measurements. The results obtained demonstrate the sensitivity and the usefulness of the sensor proposed for microwaves microfluidic characterizations. This study has been achieved at 10 GHz but it can be performed for any microwave frequency. Moreover the presented approach with the same calibration can be used to identify other materials that have complex permittivity in the same range. Of course, the sensor presented is not universe and but it can be advantageously used for wide applications in which the solution under test is aqueous. © 2015 Elsevier B.V. All rights reserved.
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Dates et versions

hal-03538485 , version 1 (21-01-2022)

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A. Chahadih, Pierre-Yves Cresson, Z. Hamouda, S. Gu, C. Mismer, et al.. Microwave/microfluidic sensor fabricated on a flexible kapton substrate for complex permittivity characterization of liquids. Sensors and Actuators A: Physical , 2015, 229, pp.128-135. ⟨10.1016/j.sna.2015.03.027⟩. ⟨hal-03538485⟩
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