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[V0.4]Dissertation_Zhenyu.pdf (3.17 MB)

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Using Leaky Coaxial Cables as Proximity Sensors: Numerical Modeling, Experiments, and Investigation

Wang, Zhenyu
http://orcid.org/0000-0003-0092-7570
http://rave.ohiolink.edu/etdc/view?acc_num=osu1637586537905678

Abstract Details

2021, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
Electromagnetic sensors have been explored over the last few years given their characteristic flexible detecting range, easily embedding into other materials, and robustness, to name but a few of the many advantages. This dissertation details the novel use of the leaky coaxial cable (LCX) as an electromagnetic proximity sensor, and elucidates the design, numerical modeling, measurement, and prototyping of a representative application of the LCX as a steering wheel proximity sensor. In this work, a practical, readily embeddable proximity sensor based on a leaky coaxial cable is proposed for detecting the presence and position of a hand on the steering wheel. Various LCX slot configurations were analyzed both numerically and experimentally. For numeric simulations, the finite-difference time-domain (FDTD) method in Cartesian coordinates was applied to a square cross-section straight leaky coaxial cable. A comparable-sized 3D-printed LCX with various configurations was also measured to verify the design of the sensor. Those numerical and experimental results were then used to inform the design of a prototype steering wheel proximity sensor that was fabricated, and then embedded into a Honda 2013 Acura MDX steering wheel. Finally, a network analyzer and the inverse discrete Fourier Transform were used to derive the hand position information. To better investigate the LCX in a curved shape, we also present transient numerical simulations that employ the three-dimensional FDTD method in cylindrical coordinates to investigate the performance of a novel curved leaky coaxial cable proximity sensor. The sensor is embedded inside a steering wheel to detect the hand position. The modeling also includes regions where a cylindrical grid is coupled to a Cartesian grid requiring special approximations to minimize errors while maintaining stability. Simulation results are in good agreement with measurements. Having gained confidence in the numerical model, simulation results are presented to understand the curved leaky coaxial cable near-field properties. Meanwhile, a practical LCX transceiver circuit prototype was designed, fabricated, and analyzed for the application of LCX-based electromagnetic proximity sensors.
Robert Lee (Advisor)
Asimina Kiourti (Advisor)
Fernando Teixeira (Committee Member)
109 p.
Electrical Engineering; Electromagnetics

Recommended Citations

Citations

  • Wang, Z. (2021). Using Leaky Coaxial Cables as Proximity Sensors: Numerical Modeling, Experiments, and Investigation [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1637586537905678

    APA Style (7th edition)

  • Wang, Zhenyu. Using Leaky Coaxial Cables as Proximity Sensors: Numerical Modeling, Experiments, and Investigation. 2021. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1637586537905678.

    MLA Style (8th edition)

  • Wang, Zhenyu. "Using Leaky Coaxial Cables as Proximity Sensors: Numerical Modeling, Experiments, and Investigation." Doctoral dissertation, Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1637586537905678

    Chicago Manual of Style (17th edition)

osu1637586537905678
218
© 2021, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.