Competitive Coriolis Vibrating Gyroscope with a Metal Resonator

The article deals with the design and features of manufacturing a Coriolis vibrating gyroscope (CVG, angular rate sensor) with a metal resonator. Piezoelectric elements are used to excite and detect oscillations of the resonator.

The design of the resonator is very important, because the technical characteristics of the CVG mainly depend on the resonator. For the production of a high-quality metal resonator with predetermined properties, a good choice is the precision alloy of 21NKMT-VI. Elimination of defects in the manufacture of the resonator, which lead to a variety of frequencies and variability, is achieved by balancing. The basic method is balancing in the 4th form of the distribution of mass defects. Calibration of the CVG with the electronics unit is the final stage of the CVG manufacturing, which results in: providing a resonance tuning condition for the sensing element, determining the feedback coefficients of the oscillation retention loop, determining the metrological characteristics of the CVG, and obtaining the correction function of the output signal from various parameters after the test complex.

When determining the correction function, the fact was taken into account that the signals for suppressing the quadrature and coriolis components are not absolutely independent. When the node signal is demodulated to quadrature and coriolis components, it is necessary to analyze the signal passed through piezoelectric elements, amplifiers and ADC. Each of these elements adds a temperature-dependent phase shift to the node signal. This phase shift can be taken into account, but not with absolute accuracy. Therefore, the output signal of the CVG should be considered as a linear combination of signals of the quadrature and coriolis components of the compensation signal. To reduce the noise of the output signal, it is possible to use various types of noise suppressing filters

The results of tests of the CVG confirming its competitiveness in comparison with the commercial analogue. The electronic control module can be designed using the Russian element base.

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