发明名称 |
Microwave steel belt location sensor for tires |
摘要 |
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 DEG to -180 DEG ) 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. <IMAGE> |
申请公布号 |
ZA9205652(B) |
申请公布日期 |
1994.01.28 |
申请号 |
ZA19920005652 |
申请日期 |
1992.07.28 |
申请人 |
COLORADO STATE UNIVERSITY RESEARCH FOUNDATION |
发明人 |
REZA ZOUGHI;SASAN BAKHTIARI |
分类号 |
G01B15/02;G01M17/02;G01N22/00;G01N22/02 |
主分类号 |
G01B15/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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