Method of correcting the gain of a capacitive member, and a device for implementing the method
AssigneeSagem Defense Securite
InventorsJean-Michel Caron, Vincent Ragot
Life of this patent
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Abstract
A method of correcting the gain of a capacitive member having electrodes that are movable relative to each other including the steps of successively applying to one of the electrodes, reduced bias voltages having opposite signs and a common value below a threshold for which a remanent field generated by said reduced bias voltages can be measured, making corresponding measurements of the output signals from the capacitive member; taking an average, and correcting the gain of the capacitive member as a function of the measured output signal.
Claims12
A method of correcting the gain of a capacitive member comprising electrodes that are movable relative to each other, with a remanent field established between the electrodes, for detecting and controlling deformation of a mechanical resonator in a vibrating gyro, wherein the method comprises the steps of:
- applying a reduced DC bias voltage to one of the electrodes, the voltage having a value below a threshold for which a remanent field generated by said reduced bias voltage can't be measured;
- measuring an output signal from the capacitive member;
- and calculating a correction for the gain of the capacitive member as a function of the measured output signal, thereby detecting the deformation of the mechanical resonator.
A device for correcting the gain of a capacitive member comprising electrodes that are movable relative to each other, for detecting and controlling deformation of a mechanical resonator in a vibrating gyro;
- and means for applying a bias signal to one of the electrodes, wherein the device includes means for applying a reduced DC bias voltage to one of the electrodes at a value that is below a threshold for which a remanent field generated by said reduced bias voltage can be measured, means for measuring an output signal from the capacitive member, and means for correcting the gain of the capacitive member as a function of the measured output signal, thereby detecting the deformation of the mechanical resonator.
Dependencies are inferred from the claim text.