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CAPACITIVE LIQUID LEVEL MEASUREMENT WITH DIFFERENTIAL OUT-OF-PHASE CHANNEL DRIVE TO COUNTERACT HUMAN BODY CAPACITANCE
CAPACITIVE LIQUID LEVEL MEASUREMENT WITH DIFFERENTIAL OUT-OF-PHASE CHANNEL DRIVE TO COUNTERACT HUMAN BODY CAPACITANCE
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机译:电容式液位测量,具有不同的相移通道驱动,可抵消人体电容
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摘要
Capacitive liquid level measurement uses differential out-of-phase (OoP) channel drive to counteract human body capacitance. In an example embodiment, a container assembly includes a capacitive sensor with symmetrical CHx and CHy capacitor electrodes, corresponding in height to a liquid level measurement range. A CHx driver provides a CHx excitation/drive to the CHx electrode, and a CHy driver provides OoP CHy excitation/drive to the CHy electrode that is substantially 180 degrees out-of-phase with the CHx drive. Capacitance associated with the liquid level is measured by acquiring capacitance measurements through the CHx channel (such as based on capacitive charge transfer), and converting the capacitance measurements to an analog voltage corresponding to liquid-level capacitance (which can then be converted to digital data). The capacitive sensor can be configured with SHLDx/SHLDy shields disposed behind, and driven in phase with, respective CHx/CHy electrodes.
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