CAPACITIVE SENSOR AND MEASUREMENT SYSTEM
First Claim
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1. A system comprising:
- a capacitive sensor including a first electrode and a second electrode; and
a measurement system configured to sense a capacitance between the first electrode and the second electrode and apply a first offset to the sensed capacitance to provide an offset compensated capacitance.
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Abstract
A system includes a capacitive sensor including a first electrode and a second electrode. The system includes a measurement system configured to sense a capacitance between the first electrode and the second electrode and apply a first offset to the sensed capacitance to provide an offset compensated capacitance.
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Citations
25 Claims
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1. A system comprising:
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a capacitive sensor including a first electrode and a second electrode; and a measurement system configured to sense a capacitance between the first electrode and the second electrode and apply a first offset to the sensed capacitance to provide an offset compensated capacitance. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for sensing, the method comprising:
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providing a capacitive sensor including a first electrode and a second electrode; sensing a capacitance between the first electrode and the second electrode; and applying a first offset signal to the sensed capacitance to provide an offset compensated capacitance. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A system comprising:
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a first transmitter electrode; a second transmitter electrode; a receiver electrode between the first and second transmitter electrodes; and a circuit configured to apply a first excitation signal to the first transmitter electrode and a second excitation signal phase shifted 180°
from the first excitation signal to the second transmitter electrode to determine a sum of a first capacitance between the first transmitter electrode and the receiver electrode and a second capacitance between the second transmitter electrode and the receiver electrode. - View Dependent Claims (15)
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16. A sensor comprising:
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a first transmitter electrode; a second transmitter electrode; a first receiver electrode; a second receiver electrode; and a circuit configured to apply a first excitation signal to the first transmitter electrode and a second excitation signal phase shifted 180°
from the first excitation signal to the second transmitter electrode to determine a sum of a first capacitance between the first transmitter electrode and the first receiver electrode and a second capacitance between the second transmitter electrode and the second receiver electrode. - View Dependent Claims (17, 18, 19, 20)
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21. A method for sensing, the method comprising:
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providing a capacitive sensor including a first transmitter and receiver electrode pair for sensing a first capacitance and a second transmitter and receiver electrode pair for sensing a second capacitance; applying a first excitation signal to the first transmitter electrode; applying a second excitation signal to the second transmitter electrode, the second excitation signal phase shifted 180°
from the first excitation signal;receiving a third signal from the first receiver electrode; receiving a fourth signal from the second receiver electrode; and determining a sum of the first capacitance and the second capacitance based on the third and fourth signals. - View Dependent Claims (22, 23, 24, 25)
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Specification