| 摘要: |
| 基于Sagnac效应的谐振式光波导陀螺具有理论精度高及易集成化等特点是导航及制导系统中重要的发展方向。由于波导腔的小型化发展趋势，现阶段光波导腔自由谱宽通常达到GHz以上，并且谐振腔的谐振频率会随温度变化而漂移，因此对激光器调谐范围提出较高的要求。当激光器调谐范围小于谐振腔的自由谱宽时，谐振频率漂移出激光器的调谐范围而导致陀螺失锁；而增大调谐系数时，会造成激光器控制精度的下降，这在陀螺应用中是互相矛盾的。本文提出了一种应用于集成化光波导陀螺样机的半导体激光器双重锁频的方法，解决了光波导谐振腔的失锁问题，并且在保证温度变化不失锁的前提下通过提升激光器控制精度，将锁频精度从7.22°/h提高到2.86°/h，完成了尺寸为Φ18cm×20cm的谐振式光波导陀螺的集成化，其1h长期零偏稳定性为0.0073°/s。 |
| 关键词: 谐振式光波导陀螺 激光辅助锁频 失锁 |
| DOI： |
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| 基金项目:高等学校博士学科点专项科研基金资助项目 |
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| A multilevel laser frequency lock-in technique based on resonator integrated optic gyro |
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| Abstract: |
| The resonator integrated optic gyro (RIOG) based on the Sagnac has the characteristics of high theoretical accuracy and easy integration. It is a research focus of navigation and guidance systems. Easy to losing lock and low lock-in accuracy are serious problem in digital RIOG at present. To solve these problems, a multilevel laser frequency lock-in technique is proposed. Experimental results show that this method can solve the problem of losing lock, and increase the lock-in accuracy more than 10 times in a variable temperature environment without out-of-lock. The integration of digital miniaturized RIOG prototype with size of Φ18cm×20cm has been completed, a long-term (1h) bias stability of 26.6deg/h is successfully demonstrated. |
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