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激光陀螺通常使用压电陶瓷换能器(PZT)作为反馈控制元件来维持腔长不变,然而PZT在推拉过程中产生的歪扭将会引起腔损的变化,进而导致光强以及零偏的变化。为了提高激光陀螺的零偏稳定性,对PZT歪扭导致的零偏变化进行了理论和实验研究。理论分析表明,PZT歪扭导致的光强变化与零偏变化密切相关,当光强相对变化10-3时,零偏变化约0.02 Hz。改变激光陀螺的纵模阶数,同时测量对应的光强和零偏,所得实验结果与理论分析基本一致。研究表明,目前四频激光陀螺中PZT歪扭导致的零偏变化在0.01 Hz的量级,因此通过对PZT制作工艺进行改进可进一步提高四频激光陀螺的性能。该研究对高精度四频激光陀螺的研制具有一定的参考价值。
Laser gyroscopes generally use piezoelectric ceramic transducers (PZT) as the feedback control element to maintain the cavity length. However, the distortion generated by the PZT during the push-pull process will cause the cavity loss to change, resulting in the light intensity and the bias Variety. In order to improve the bias stability of the laser gyro, theoretical and experimental studies on the zero-bias changes caused by the PZT skew are carried out. The theoretical analysis shows that the change of light intensity caused by the distortion of PZT is closely related to the change of zero bias. When the relative light intensity changes 10-3, the zero bias changes about 0.02 Hz. Changing the order of the longitudinal modes of the laser gyroscope and measuring the corresponding light intensities and zero offsets at the same time, the experimental results are basically consistent with the theoretical analysis. The research shows that the current bias of PZT in quadruplex laser gyroscope is about 0.01 Hz. Therefore, the performance of quadrupole laser gyro can be further improved by improving the fabrication process of PZT. The research has certain reference value for the development of high precision quadrupole laser gyroscope.