基于LabVIEW的石英音叉陀螺闭环驱动的实现

Realization of The Closed Loop Driving for Quartz Tuning Fork Gyroscope Based on LabVIEW

分析了石英音叉陀螺驱动端幅频相频特性,设计了LabVIEW控制算法,使陀螺工作在最佳频率点;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驱动端叉指振动速度,且串联支路电流在不同频率点处对频率的敏感度不同,然后通过对陀螺进行扫频得到了陀螺驱动端幅频相频特性,最后,基于在谐振频率点附近陀螺驱动端相频特性呈线性关系,设计了LabVIEW控制算法;根据该算法,设置相位分别为0°和-4,°40min内这两个谐振频率点处驱动反馈信号的标准差分别为1.4728e-005v、1.9229e-005v(1σ),因此,0相位处为较理想工作点,设置参考相位为各个谐振频率点的对应相位,通过比较可确定陀螺的最佳谐振频率点,提高陀螺驱动端的振动稳定性。

The characteristic of the amplitude-frequency and the phase-frequency at the quartz tuning fork gyroscope＇s driving is ana- lyzed, and the controlling arithmetic of LabVIEW is designed, causing the quartz tuning fork gyroscope （gyro） to quiver at the best frequency. First, based on the theory of electro-mechanical equivalent, the viewpoint that the current in series branch circuit is equivalent to the os- cillation velocity is presented, and the current＇s sensitivity to frequency is different at different frequencies; Then, the characteristic of the amplitude-frequency and the phase-frequency at the quartz tuning fork gyroscope＇s driving is got according to frequency sweep. In the end, based on the linear characteristic of the phase-frequency near the gyro＇s driving resonance frequency, design a controlling arithmetic of Lab- VIEW. Set the phase at 0deg and--4deg. At these two resonance frequencies the standard differences of the driving feedback signal are 1. 4728e--005v, 1. 9229e--005v （la） in forty minutes, so, at the 0deg there is the better resonance frequency. Setting the reference phase at the gyro＇s different resonance frequencies＇ corresponding phases and comparing them, the gyro＇s best resonance frequency can be gotten, improving the stability of the gyro＇s quiverment at the driving.