Device and method for capacitive measurement by a floating bridge
AssigneeNanotec Solution
InventorsFrédéric Ossart, Didier Roziere
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Abstract
A device for capacitive measurement by a floating bridge, including: a sensor module including at least one measuring electrode and at least one guard electrode arranged close to a target connected to a general earth, at least one integrated circuit for capacitive measurement, provided with a guard to which the guard electrode is connected, having an input connected to the measuring electrode, a guard connected to the reference earth of the integrated circuit, an excitation output connected to the general earth, a measurement output, and structure for supplying the integrated circuit for capacitive measurement in floating mode.
Claims35
A device for capacitive measurement by a floating bridge, comprising:
- a sensor module comprising at least one measuring electrode and at least one guard electrode arranged close to a target connected to a general earth,
- a guard to which said guard electrode is connected,
- at least one integrated circuit for capacitive measurement, and comprising (i) a measurement input and (ii) an excitation output for measuring capacitances between electrodes connected respectively to said measurement input and to an excitation signal generated on said excitation output, (iii) an earth terminal and (iv) a measurement output,
- means for supplying said integrated circuit for capacitive measurement in floating mode, and
- wherein said measurement input is connected to said measuring electrode, said guard is connected to the reference earth terminal of said integrated circuit, and said excitation output is connected to said general earth.
A method for capacitive measurement by floating bridge using a sensor module, comprising steps of:
- arranging at least one measuring electrode and at least one guard electrode close to a target connected to a general earth,
- connecting said guard electrode to a guard,
- providing at least one integrated circuit for capacitive measurement, comprising (i) a measurement input and (ii) an excitation output for measuring capacitances between electrodes connected respectively to said measurement input and to an excitation signal generated on said excitation output, (iii) an earth terminal and (iv) a measurement output,
- supplying said integrated circuit for capacitive measurement in floating mode,
- connecting said measurement input to said measuring electrode,
- connecting said guard to the reference earth terminal of said integrated circuit, and
- connecting said excitation output to said general earth.
Dependencies are inferred from the claim text.