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Salt content detection using a microwave sensor
Bao, X.; Wang, Z.; Bao, J.; Gugliandolo, G.; Yuan, H.; Zhao, Z.; Li, J.; Donato, N.; Crupi, G.; Nauwelaers, B.; Schreurs, D. (2022). Salt content detection using a microwave sensor, in: 2022 IEEE International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters (MetroSea). pp. 479-483. https://dx.doi.org/10.1109/METROSEA55331.2022.9950949
In: (2022). 2022 IEEE International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters (MetroSea). IEEE: [s.l.]. ISBN 978-1-6654-9943-9; e-ISBN 978-1-6654-9942-2. https://dx.doi.org/10.1109/MetroSea55331.2022, more

Available in  Authors 
Document type: Conference paper

Keyword
    Marine/Coastal
Author keywords
    Complex conductivity; interdigital electrodes; microfluidic technique; microwave sensing; saline solutions

Authors  Top 
  • Bao, X.
  • Wang, Z.
  • Bao, J., more
  • Gugliandolo, G.
  • Yuan, H.
  • Zhao, Z.
  • Li, J.
  • Donato, N.
  • Crupi, G.
  • Nauwelaers, B., more
  • Schreurs, D., more

Abstract
    A microwave interdigital-electrode (IDE) sensor is used to detect the salt content in saline solutions. As there is electrode polarization when measuring a liquid that contains lots of ions, and considering its dispersion property at microwaves, frequency dependent complex conductivity is investigated in the present study. A reasonable equivalent circuit of the liquid loaded IDE sensor is provided, which is further used to deduce the characterization theory. The theory demonstrates that the measured scattering (S-)parameters can be accurately translated to the complex conductivity of the liquid under detection. The characterization theory is validated with finite-element simulation method. The measurements on some saline solutions demonstrate that the IDE method has the capability of detecting the salt content in liquids in a non-invasive and contactless way. This technique is targeted for a fast pollution detection or characterization of sea water.

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