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A novel microwave sensor using a Complementary Circular Spiral Resonator (CCSR) accurately identifies liquids and measures ethanol-water concentrations. This low-cost, high-sensitivity sensor shows promise for industrial liquid monitoring applications.

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CCSRdielectric constanthigh sensitivityliquid determinationlow-costmicrowave sensor

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Area of Science:

  • Microwave Engineering
  • Sensor Technology
  • Material Science

Background:

  • Accurate liquid identification and concentration determination are crucial for industrial processes.
  • Existing methods may be costly, bulky, or lack sensitivity.
  • Development of a compact, cost-effective, and sensitive sensor is needed.

Purpose of the Study:

  • To develop and validate a low-cost, high-sensitivity microwave sensor for liquid analysis.
  • To identify common liquid samples and determine the dielectric constants of ethanol-water mixtures.
  • To establish a reliable method for liquid monitoring using resonant frequency measurements.

Main Methods:

  • Fabrication of a Complementary Circular Spiral Resonator (CCSR) operating at 2.4 GHz.
  • Integration of a square channel using acrylic paint for precise liquid sample placement.
  • Utilizing High-Frequency Simulator Structure (HFSS) for dielectric constant estimation.
  • Measurement of resonant frequency shifts to determine liquid properties.

Main Results:

  • The CCSR sensor demonstrated high sensitivity in identifying various liquid samples.
  • Accurate determination of ethanol-water mixture concentrations was achieved.
  • Experimental results showed strong agreement with established data.
  • Two parabolic equations were derived for liquid identification and concentration analysis.

Conclusions:

  • The developed microwave sensor offers a feasible, low-cost solution for liquid monitoring.
  • High sensitivity and low material consumption make it suitable for industrial applications.
  • The system provides a broad prospect for real-time liquid analysis and quality control.