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Studies on Dielectric Constants of Liquids at Microwave Frequencies by a Novel Coaxial Cable Fabry-Perot Interferometer Sensor

Zeng, Shixuan
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1543920601816572

Abstract Details

2018, PhD, University of Cincinnati, Engineering and Applied Science: Chemical Engineering.
The understanding of dielectric constant and its temperature and compositional dependencies for dielectric liquids at microwave frequency is needed in many important technologies such as microwave heating, microwave chemical synthesis, electric insulation, and electric device cooling, microwave sensing, and design and synthesis of alternative dielectric fluids, etc. However, there are limited effective techniques for fast and accurate measurement of liquid dielectric constants in high frequency ranges. The technical issues of the current dielectric constant measurement technologies may include the requirement of repeated calibrations, complicated sample preparation, costly precision device fabrication, challenging control of operation conditions, and limited testing frequency ranges. From fluid thermodynamics standpoint, because the molecular interactions and interfacial phenomena in signal phase or multiphase mixtures can significantly influence the fluid permittivity under electromagnetic fields, the overall volumetric and weight fractions are inefficient for correlating the mixture dielectric properties. Therefore, the conventional mixing rules that are established based on the Clausius-Mossotti model are often ineffective in representing the compositional dependencies of dielectric constants for highly non-ideal liquid mixtures. This dissertation deals with (1) the establishment of a novel metal-ceramic coaxial cable Fabry-Perot interferometer (MCCC-FPI) sensor platform and the physical model of its sensing operation, (2) demonstration of the new MCCC-FPI sensor for measuring dielectric constants of liquid fluids in a wide frequency range of 1-6 GHz, (3) studies on dielectric constants of different types of liquid mixtures, and (4) establishment of a new mixing rule for improved correlation between dielectric constant and liquid composition. The dissertation work is also extended to measurement of dielectric constants of the nanoporous zeolite crystals under gas adsorption to explore the potential of using the zeolite-packed MCCC-FPI for gas sensing.
Junhang Dong, Ph.D. (Committee Chair)
Yoonjee Park, Ph.D. (Committee Member)
Vesselin Shanov, Ph.D. (Committee Member)
Hai Xiao, Ph.D. (Committee Member)
114 p.
Chemical Engineering
Dielectric constant; Microwave frequency; Coaxial cable; Interferometer; Mixing rule; Chemical sensor

Recommended Citations

Citations

  • Zeng, S. (2018). Studies on Dielectric Constants of Liquids at Microwave Frequencies by a Novel Coaxial Cable Fabry-Perot Interferometer Sensor [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1543920601816572

    APA Style (7th edition)

  • Zeng, Shixuan. Studies on Dielectric Constants of Liquids at Microwave Frequencies by a Novel Coaxial Cable Fabry-Perot Interferometer Sensor. 2018. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1543920601816572.

    MLA Style (8th edition)

  • Zeng, Shixuan. "Studies on Dielectric Constants of Liquids at Microwave Frequencies by a Novel Coaxial Cable Fabry-Perot Interferometer Sensor." Doctoral dissertation, University of Cincinnati, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1543920601816572

    Chicago Manual of Style (17th edition)

ucin1543920601816572
238
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This open access ETD is published by University of Cincinnati and OhioLINK.