Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1992-10-13
1993-06-01
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
324638, 324642, 324645, 73146, G01M 1702, E01C 2300
Patent
active
052163725
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.
REFERENCES:
patent: 2442606 (1948-06-01), Korman
patent: 2605323 (1952-07-01), Samuel
patent: 3238451 (1966-03-01), Shively
patent: 3549986 (1970-12-01), Prine
patent: 3562642 (1971-02-01), Hochschild
patent: 3622874 (1971-11-01), Chasek
patent: 3648164 (1972-03-01), Searle et al.
patent: 3796948 (1974-03-01), Wentworth
patent: 4075555 (1978-02-01), Wight
patent: 4224624 (1980-09-01), Evans
patent: 4707652 (1987-11-01), Lowitz
patent: 4818930 (1989-04-01), Flemming
patent: 4936529 (1990-06-01), Maine
Caldecott, "The Generalized Multiprobe Reflectometer and Its Application to Automated Transmission Line Measurements", IEEE Transactions on Antennas and Propagation, vol. AP-21, No. 4, pp. 550-554, Jul. 1973.
Zoughi, et al., "Nondestructive Microwave Thickness Measurements of Dielectric Slabs", Materials Evaluation, vol. 48, No. 9, pp. 1100-1105, Sep. 1990.
Bakhtiari Sasan
Zoughi Reza
Colorado State University Research Foundation
Solis Jose M.
Wieder Kenneth A.
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