Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1994-08-16
1999-12-21
Ballato, Josie
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
324646, G01R 2704
Patent
active
060053976
ABSTRACT:
The thickness of the layers of rubber covering the steel belts within a tire can be measured by transmitting a microwave signal toward the outer surface of the tire and measuring the phase shift of the signal reflected by the tire. In the preferred embodiment, a waveguide is used to direct the microwave signal toward the tire. A standing wave is created within the waveguide by interference between the transmitted microwave signal and the microwave signal reflected from the tire. A series of crystal detectors mounted along the length of the waveguide measure the standing wave. A processor calculates the phase of the reflection coefficient, and determines the thickness of the rubber layer as a predetermined function of the phase. By proper selection of the microwave frequency and the spacing between the waveguide and the tire, the rubber layer thickness can be uniquely determined as a function of phase for any range of rubber thicknesses likely to be encountered in a tire. In addition, a phase reversal (from 180.degree. to -180.degree.) can be arranged to occur at a specific rubber thickness by proper selection of these parameters. This can be used in the tire retreading process to halt buffing when a predetermined minimum rubber thickness has been reached.
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Bakhtiari Sasan
Zoughi Reza
Ballato Josie
Colorado State University Research Foundation
Solis Jose M.
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