Disertation Proposalby Farhad Bassali
Advisor: Dr. Gerald Whitman
Department of Electrical and Computer Engineering, NJIT
Time: 02:30 PM, Wednesday, April 21, 29, 2004.
Place: Room 305 Faculty bulding, New Jersey Institute of Technology (NJIT), Newark, NJ.

Abstract

A microwave measurement system is developed for the determination of piston displacement in a fluid filled cylindrical structure. The piston plus cylindrical encasement of a hydraulic / pneumatic system is modeled as a uniform cylindrical waveguide terminated in a metal plate, the measurement system incorporates a novel shaped probe antenna to measure the relative phase of the reflected equivalent voltage wave with respect to frequency. The idea to measure the slope of the relative phase is new and required construction of a new antenna structure. Instead of using the phase slope with respect to frequency, the total phase shift in a given frequency range is used to determine the location of the piston in the cylindrical chamber. Simulation and measurement will be used to determine the impedance of the antenna as well as the electromagnetic field at different locations inside the cylinder. In addition, the antenna will be analyzed to optimize its design, which ought to result in minimizing the reflections.