Guided wave radar level gauge system with dielectric constant compensation through multi-mode propagation
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United States of America Patent
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Oct 28, 2014
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Jun 14, 2011
filing date -
Jun 14, 2011
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Abstract
A guided wave radar level gauge system, comprising a transmission line probe configured to support a first propagation mode such that it travels along the transmission line probe with a first propagation velocity exhibiting a first dependence on a dielectric constant of the surrounding medium, and support a second propagation mode such that it travels along the transmission line probe with a second propagation velocity exhibiting a second dependence, different from the first dependence, on the dielectric constant of the surrounding medium. The guided wave radar level gauge system further comprises processing circuitry connected to the transceiver for determining the filling level based on the reflected electromagnetic signal in the first propagation mode and the second propagation mode, and a known relation between the first dependence and the second dependence on the dielectric constant of the surrounding medium. Hereby, a filling level determination that is independent of the dielectric constant of the medium surrounding the transmission line probe can be achieved.
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