异面腔四频差动激光陀螺的智能选模

Intelligent modes selection of four-frequency differential laser gyros with non-planar cavity

针对异面腔四频差动激光陀螺(DILAG)工作模式不确定性和跳模对其性能的负面影响,提出了根据开机时腔体温度快速选择最优初始模的智能选模方法。分析了纵模阶数对DILAG的零偏和比例因子的影响以及跳模的危害,指出选择最优初始模是在现有基础上进一步提高DILAG性能的重要方法。通过温度实验做出了最优模相应的压电换能器(PZT)驱动电压随温度的变化曲线,为建立选模模型提供了基本依据。实验表明,智能选模使腔长控制系统加电后能快速稳定在最优初始模,减小了跳模几率,提高了腔长控制电路的鲁棒性和自适应性,对改善DILAG的性能、可靠性具有实用价值。

In order to overcome the negative influence of mode uncertainty and mode jump on four-frequency differential laser gyro（DILAG） with non-planar cavity,an intelligent mode selection method is proposed.By the method the optimum initial mode is rapidly selected according to cavity temperature and known thermal model.The data of piezoelectric transducer（PZT） driver voltage versus temperature for optimum initial mode is obtained with experiment.Then thermal model of optimum initial mode is established.Experimental results show that the intelligent mode selection method made the cavity length control system stable at the optimum initial mode and reduced probability of mode jump.So the method has advantage to improve the bias repeatability and reliability of DILAG.