G - Physics – 01 – B
Patent
G - Physics
01
B
G01B 15/02 (2006.01) G01N 22/00 (2006.01) G01N 22/02 (2006.01)
Patent
CA 2074109
-23- MICROWAVE STEEL BELT LOCATION SENSOR FOR TIRES 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° to -180°) 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.
Bakhtiari Sasan
Zoughi Reza
Borden Ladner Gervais Llp
Colorado State University Research Foundation
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