John A Cosenza

US Patent:

7098671, Aug 29, 2006

Filed:

Mar 5, 2004

Appl. No.:

10/794426

Inventors:

Fred Bassali - Kew Gardens Hills NY, US
John Cosenza - Coram NY, US

International Classification:

G01R 27/32

US Classification:

324642, 324644

Abstract:

A microwave measurement system is utilized for the determination of displacement of a piston in a fluid filled cylindrical structure. The piston plus cylindrical encasement of the hydraulic system is modeled as a uniform cylindrical waveguide terminated in a metal plate. A novel shaped probe antenna to measure the slope of the relative phase of the reflected equivalent voltage wave with respect to frequency. The idea to measure the slope of the relative phase is novel and requires 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.

US Patent:

7466144, Dec 16, 2008

Filed:

Aug 4, 2006

Appl. No.:

11/499905

Inventors:

Fred Bassali - Kew Gardens Hills NY, US
John Cosenza - Coram NY, US

International Classification:

G01R 27/32
F01B 31/12

US Classification:

324644, 324646, 92 5 R, 91 1

Abstract:

A microwave measurement system is utilized for the determination of displacement of a piston in a fluid filled cylindrical structure. The piston plus cylindrical encasement of the hydraulic system is modeled as a uniform cylindrical waveguide terminated in a metal plate. A novel shaped probe antenna to measure the slope of the relative phase of the reflected equivalent voltage wave with respect to frequency. The idea to measure the slope of the relative phase is novel and requires 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.