Liquid gaging system contamination monitor
First Claim
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1. In a liquid gaging system, an apparatus for monitoring a quadrature signal from a capacitive sensor, comprising:
- a capacitive sensor for providing a liquid measurement signal related to a liquid in a tank, the liquid measurement signal comprising a capacitive signal and a quadrature signal; and
means for monitoring the quadrature signal through null detection of the capacitive signal, the null detection being implemented through a successive approximation sequence, the means for monitoring being connected to the sensor.
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Abstract
The present invention is part of a liquid gaging system and comprises an apparatus for monitoring a quadrature signal from a capacitor sensor. Included is a capacitive sensor for providing a liquid measurement signal related to a liquid in a tank, the liquid measurement signal comprising a capacitive signal and a quadrature signal. The invention also includes apparatus for monitoring the quadrature signal through null detection of the capacitive signal, the null detection being implemented through a rebalance approximation sequence. The apparatus for monitoring is connected to the sensor.
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Citations
46 Claims
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1. In a liquid gaging system, an apparatus for monitoring a quadrature signal from a capacitive sensor, comprising:
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a capacitive sensor for providing a liquid measurement signal related to a liquid in a tank, the liquid measurement signal comprising a capacitive signal and a quadrature signal; and means for monitoring the quadrature signal through null detection of the capacitive signal, the null detection being implemented through a successive approximation sequence, the means for monitoring being connected to the sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. In a liquid gaging system, an apparatus for selectively monitoring individual sensors one at a time for a quadrature signal, comprising:
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a plurality of capacitive sensors, each sensor providing a liquid measurement signal related to a liquid in a tank, each liquid measurement signal comprising a capacitive signal and a quadrature signal; and means for selectively monitoring individual sensors one at a time for the quadrature signal, the means for selectively monitoring being connected to the sensors. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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Specification