基于惠更斯电桥的 HRG 谐振子精密装配方法

In order to solve the problem that the gain of detection loop is inconsistent due to the asymmetric assembly gap of hemispherical resonator gyroscope (HRG), which leads to additional gyro drift in full Angle mode, a gap detection model based on Huygens bridge is established, and the optimal circuit matching parameters under the model are given. On this basis, a harmonic oscillator assembly gap adjustment device is built. The gap asymmetry control precision is better than 0.1 μm, the gap uniformity is better than 0.9%, and the gap uniformity is improved by 80.4% compared with the traditional capacitance measuring instrument gap adjustment method. The experimental results of full-angle calibration tests on the gyro prototype before and after the assembly scheme improvement show that the lateral fluctuation error of the gyro output angular velocity has been suppressed after the improvement. The stability of the zero-stable gyro output for 1 s smoothing and 100 s smoothing has been improved by 71.7% and 58.7%, respectively, which proves that the precise assembly method based on the principle of Huygens's bridge resonator (HRG) can effectively improve assembly accuracy and gyro accuracy.