Method for implementing a resonator under electrostatic forces
View Patent ↗In an implementation in rate gyro mode, the method includes exciting the vibrating member with a combination of control signals including an amplitude control signal at a frequency twice the resonant frequency, and a quadrature control signal at DC. In free gyro mode, the method includes the steps of applying a combination of signals to common electrodes 5 and of applying the combination in alternation to main electrodes 5.1 and 5.2 and to auxiliary electrodes 7.1 and 7.2 interleaved between the main electrodes.
1. A method of implementing a resonator in free gyro mode, the resonator comprising a vibrating member adapted to be set into vibration at a resonant frequency by means of a combination of control signals comprising, during a sustaining stage, an amplitude control signal at a frequency twice the resonant frequency of the vibrating member, and a DC quadrature control signal, both control signals being amplitude modulated,
the method including the steps of applying the amplitude control signal to the vibrating member itself, of applying the quadrature control signal to electrodes disposed facing the vibrating member, and of simultaneously detecting vibration of the vibrating member using the same electrodes.
2. A method according to claim 1 , wherein the quadrature control signal is applied in alternation to two groups of the electrodes that are interleaved between each other.
3. A method according to claim 1 , wherein detection gain of the electrodes in quadrature is balanced by analyzing the vibration at a frequency twice the resonant frequency in order to determine the real detection gains, and by calculating a balancing coefficient.