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四频差动陀螺采用恒定偏频方案,较好地解决了锁区的问题,与交变偏频的单陀螺相比有一定的优势。但是由于是采用圆偏振光,增益管过纵磁场的零漂大,因此地磁及杂散磁场对四频差动陀螺的影响是相当大的。又由于一般高导磁软磁材料对应力、温度很敏感,很难适应陀螺的应用环境。设计出的适用于工程环境的磁屏蔽罩满足了四频差动激光陀螺。
The quadrifilar differential gyroscope adopts a constant bias scheme, which solves the problem of the lock zone well and has some advantages over the single gyro with alternating frequency offset. However, due to the use of circularly polarized light, the gain tube has a large zero drift over the longitudinal magnetic field. Therefore, the influence of the geomagnetic and stray magnetic fields on the quadruple-frequency differential gyro is considerable. Also due to the general high magnetic permeability of the magnetic material, the temperature is very sensitive, it is difficult to adapt to the application environment of the gyroscope. The magnetic shield designed for the engineering environment meets the quad-band differential laser gyro.