Vibrating rate gyro with slaving of detection frequency to excitation frequency
First Claim
1. A gyroscope comprising at least one mass capable of vibrating along an x axis at a resonant excitation frequency Fx and capable of vibrating along axis perpendicular to the x axis, at a resonant detection frequency Fy, under the effect of the Coriolis force generated by a rotation about a z axis perpendicular to the x and y axes, comprising connected to the mass, a signal generator for generating a signal that disturbs the vibration of the mass along the y-axis, and a feedback control loop for controlling the resonant frequency Fy so that Fy is equal or practically equal to Fx throughout the duration of use of the gyroscope, the feedback control loop comprising:
- means for modifying the resonant detection frequency Fy;
means for detecting the variation induced by the disturbing signal on the vibration of the mass along the y-axis, an error signal e representative of the difference between Fx and Fy being deduced from the variation induced by the disturbing signal; and
control means for controlling the Fy-modifying means, the control being established on the basis of the error signal e.
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Abstract
The invention relates to a gyroscope comprising at least one mass capable of vibrating along an x axis at a resonant excitation frequency Fx capable of vibrating along a y axis perpendicular to the x axis, at a resonant detection frequency Fy, under the effect of a Coriolis force generated by a rotation about a z axis perpendicular to the x and y axes. It includes, connected to the mass or masses, a feedback control loop for controlling the resonant frequency Fy so that Fy is equal or practically equal to Fx throughout the duration of use of the gyroscope.
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Citations
17 Claims
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1. A gyroscope comprising at least one mass capable of vibrating along an x axis at a resonant excitation frequency Fx and capable of vibrating along axis perpendicular to the x axis, at a resonant detection frequency Fy, under the effect of the Coriolis force generated by a rotation about a z axis perpendicular to the x and y axes, comprising connected to the mass, a signal generator for generating a signal that disturbs the vibration of the mass along the y-axis, and a feedback control loop for controlling the resonant frequency Fy so that Fy is equal or practically equal to Fx throughout the duration of use of the gyroscope, the feedback control loop comprising:
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means for modifying the resonant detection frequency Fy; means for detecting the variation induced by the disturbing signal on the vibration of the mass along the y-axis, an error signal e representative of the difference between Fx and Fy being deduced from the variation induced by the disturbing signal; and control means for controlling the Fy-modifying means, the control being established on the basis of the error signal e. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification