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谐振式光纤陀螺(R-FOG)是基于Sagnac效应产生的谐振频率差来检测旋转角速率的一种新型光学传感器。利用闭环锁频系统可以减小光纤环形谐振腔受温度、应力等外界环境变化的影响,提高陀螺性能。提出了数字与模拟相结合的闭环锁频系统方案设计,克服了模拟锁频电路带来的电路温漂,采用模拟解调技术来降低了对系统A/D转换器的转换速度的要求,同时无需对复杂数字解调算法的研究。闭环锁频系统应用于陀螺测试系统中,实验测得10 s时间内的锁频精度为2.15(°)/s。
Resonant Fiber Optic Gyroscope (R-FOG) is a new type of optical sensor based on the difference of resonance frequency caused by Sagnac effect to detect the rotation angular velocity. The use of closed-loop frequency-locked system can reduce the ring resonator temperature, stress and other changes in the external environment, improve gyro performance. The design of the closed-loop frequency-locked system combining digital and analog is proposed to overcome the circuit temperature drift caused by the analog frequency-locked circuit. The analog demodulation technique is adopted to reduce the conversion speed of the system A / D converter. Meanwhile, No need for complex digital demodulation algorithm. The closed-loop frequency-locked system is applied to the gyro test system. The experimentally measured frequency-locking accuracy within 10 s is 2.15 (°) / s.