Multimode oscillator enabling simultaneous monitoring of variations in several resonance frequencies of a resonator

摘要

A multimode oscillator comprising:
a resonator including:
a moving element;actuators of the moving element according to two symmetric and antisymmetric resonance modes;several detectors of the displacement of the moving element;polarization circuitry of the detectors by signals out of phase with each other;a first calculator carrying out a first operation conserving the frequential components of the first mode and cancelling those of the second mode;a second calculator carrying out a second operation conserving the frequential components of the second mode and cancelling those of the first mode;;and in which the resonator and the calculators form two self-oscillating loops making the oscillator resonate simultaneously in the two modes.

主权项

1. A multimode oscillator comprising at least:
a resonator including:
at least one moving elementactuators able to make the moving element resonate according to at least two resonance modes of which one is symmetric and the other is antisymmetric;several detectors of the displacement of the moving element each comprising at least one electrical parameter of which the value varies as a function of the displacement of the moving element and coupled to the moving element such that they induce, in at least first and second output signals of the resonator representative of the variations in said electrical parameter, phase differences such that φE1−φO1≠φE2−φO2, with φE1 the phase of a first frequential component of the first output signal linked to a first of the resonance modes, φO1 the phase of a first frequential component of the second output signal linked to the first of the resonance modes, φE2 the phase of a second frequential component of the first output signal linked to a second of the resonance modes, and φO2 the phase of a second frequential component of the second output signal linked to the second of the resonance modes; polarization circuitry able to apply to the detectors electric polarization signals; a first calculator able to carry out at least one first operation between the first and second output signals conserving the first frequential components of the first and second output signals and cancelling the second frequential components of the first and second output signals; a second calculator able to carry out at least one second operation between the first and second output signals conserving the second frequential components of the first and second output signals and cancelling the first frequential components of the first and second output signals; and in which the resonator and the first and second calculators form part of at least two self-oscillating loops able to make the resonator resonate simultaneously in the two resonance modes.