Non-invasive radio frequency liquid level and volume detection system and method using phase shift
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United States of America Patent
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Nov 28, 2017
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Oct 17, 2014
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Mar 8, 2011
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Abstract
A medical fluid system includes a container holding a fluid at a level; and a radio frequency level sensor operably connected to the container and including an emitting electrode and a receiving electrode, the electrodes operating as a transmission line having an electrical impedance that varies with the level or volume of the fluid in the container, the level sensor configured to measure a phase shift of the transmission line, the phase shift indicative of the level or volume of the fluid in the container.
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