Application of a magnetic sensor for determining the mass imbalance of the Coriolis vibratory gyroscope with cylindrical metallic resonator

Abstract

The main working part of the Coriolis vibratory gyroscopes (CVGs) is a thin-walled axially symmetrical shell made of a high-Q material. One of the popular designs nowadays are CVGs with cylindrical metallic resonators. Various manufacturing errors lead to emergence of the mass imbalance on the resonator surface that decreases the sensor accuracy. Errors in the mass distribution are eliminated by the balancing procedure following the mass imbalance parameters evaluation by measuring the amplitude of the elastically suspended resonator's center of mass vibration with the use of two-coordinate sensors. Application of piezoelectric sensors presents certain difficulties due to the fact that their signal strongly depends on the nature of the acoustic sensor-to-surface contact, which is badly reproduced when reinstalling the resonator. In addition, piezoelectric sensors are sensitive to several forms of deformation, which brings in an additional measurement error. In the report, for the first time, we propose to use for this purpose magnetoelectric sensors. Experiments carried out on the specialized layout equipment have shown that the use of the two-coordinate magnetoelectric sensor allows determining imbalance parameters of metallic resonators with accuracy sufficient for low- and medium class CVGs.