Liquid gaging system null balance circuitry
First Claim
1. Apparatus for nulling a signal from a capacitive sensor means with a signal from a reference comprising:
- capacitive sensor means for providing a liquid measurement signal;
reference means for selectively providing a series of reference signals having predetermined amplitudes, the reference means having terminal means for receiving a series of rebalance approximation sequence control signals for selectively controlling the signal amplitudes, the rebalance approximation sequence control signals being generated through a successive approximation sequence;
computing means for generating the series of rebalance approximation sequence control signals through the successive approximation sequence, the computing means being connected to the reference means; and
null detecting means for detecting the presence of a null, the null detecting means being connected to the capacitive sensor means and the reference means.
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Abstract
Circuitry for nulling a signal from a capacitive sensor apparatus with a signal from a reference. The invention includes capacitive sensor apparatus for providing a liquid measurement signal. Also included is reference apparatus for selectively providing a series of reference signals having predetermined amplitudes, the reference apparatus having terminal apparatus for receiving rebalance approximation sequence control signals for selectively controlling the signal amplitudes. The invention further includes null detecting apparatus for detecting the presence of a null, the null detecting apparatus being connected to the capacitive sensor apparatus and the reference apparatus.
50 Citations
53 Claims
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1. Apparatus for nulling a signal from a capacitive sensor means with a signal from a reference comprising:
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capacitive sensor means for providing a liquid measurement signal; reference means for selectively providing a series of reference signals having predetermined amplitudes, the reference means having terminal means for receiving a series of rebalance approximation sequence control signals for selectively controlling the signal amplitudes, the rebalance approximation sequence control signals being generated through a successive approximation sequence; computing means for generating the series of rebalance approximation sequence control signals through the successive approximation sequence, the computing means being connected to the reference means; and null detecting means for detecting the presence of a null, the null detecting means being connected to the capacitive sensor means and the reference means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. Apparatus for nulling a signal from individual capacitive sensor means with a signal from a reference comprising:
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a plurality of capacitive sensor means, each capacitive sensor means providing a liquid measurement signal; reference means for selectively providing a series of reference signals having predetermined amplitudes, the reference means having terminal means for receiving a series of rebalance approximation sequence control signals for selectively controlling the signal amplitudes, the rebalance approximation sequence control signals being generated through a successive approximation sequence; computing means for generating the series of rebalance approximation sequence control signals through the successive approximation sequence, the computing means being connected to the reference means; and null detecting means for detecting the presence of a null caused by the liquid measurement signal from individual capacitive sensor means and a reference signal from the reference means, the null detecting means detecting a null corresponding to one capacitive sensor means at a time, there being means for connecting the null detecting means to the reference means and to each capacitive sensor means. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. Apparatus for nulling a signal from individual capacitive sensor means with a signal from a reference comprising:
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a plurality of capacitive sensor means, each capacitive sensor means providing a liquid measurement signal; reference means for providing a reference signal having a controllable amplitude, the reference means having terminal means for receiving control signals for selectively controlling the reference signal amplitude; and null detecting means for detecting the presence of a null caused by the liquid measurement signal from individual capacitive sensor means and a reference signal from the reference means, the null detecting means detecting a null corresponding to one capacitive sensor means at a time, there being means for connecting the null detecting means to the reference means and to each capacitive sensor means. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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Specification