分析了石英音叉陀螺驱动端叉指振动速度幅值在3个不同谐振频率点的稳定性,实现了最佳谐振频率点的控制。首先根据机电等效理论得出陀螺等效电路中串联支路电流等效于音叉振动速度;然后分析了串联支路导纳的幅频特性,得出在串联谐振频率点处音叉振动速度幅值受频率抖动影响最小的结论;但实际求得的谐振频率点与真实谐振频率点之间存在差别。设计移相电路,调整移相电路的阻容值使陀螺工作在不同的谐振频率点,通过比较可以看出在真实串联谐振频率点处陀螺驱动端叉指振动最稳定;调整移相电路的阻容值使其产生3.78°的相移可使陀螺工作在真实串联谐振频率点处。

The amplitude stability of the driving oscillation velocity at three different resonance frequencies is analyzed, and the control for the quartz tuning fork gyroscope at the best resonance frequency is realized. First, based on the theory of electro-mechanical equivalent, the viewpoint that the current in series branch circuit is equivalent to the oscillation velocity is presented. And then, a conclusion is obtained that the dithering of the frequency has least effect on amplitude of the tuning forks oscillation velocity at the series resonance frequency. But there is difference between the real resonance frequencies and the measured resonance frequencies. A phase-shift circuit is designed and its resistance and capacitance are adjusted to make the gyro work at different resonance frequencies. It is showed that the amplitude stability of the driving oscillation velocity is the best at the real series resonance frequency. A phase-shift of 3.78° can make the gyro work at the real series resonance frequency by adjusting the circuits resistance and capacitance.