一种基于自注入锁定的谐振式微光学陀螺设计

Design of a resonant micro-optical gyro based on self-injection locking

针对目前谐振式光学陀螺仪灵敏度低以及窄线宽可调激光器体积大无法集成化等问题,提出一种基于自注入锁定的新型谐振式微光学陀螺设计方案。首先,提出的方案中通过拍频检测技术和互易性灵敏度增强的方法,有效地提高了陀螺灵敏度,其理论灵敏度在6 KHz调制频率下可以达到2×10^-4°/h。此外,提出的方案中通过采用一种微型化MHz线宽的分布式反馈半导体激光器(10 cm^3)代替传统谐振陀螺的窄线宽可调谐激光器(480 cm^3),大大降低了陀螺体积和成本。相应的理论分析与设计计算为所提出的谐振式微光学陀螺的工程化奠定了坚实的基础。

Since the sensitivity of gyro is usually limited by two main factors:low signal-to-noise ratio and immature signal detecting technique,the idea and design of a novel resonant micro-optical gyro based on a self-injection locking technique is proposed.Firstly,according to the proposed scheme,the sensitivity of gyro is improved effectively by enhancing the reciprocity and measuring beat frequency.Theory sensitivity is demonstrated to be at the order of 10^-4°/h under a 6 KHz modulation frequency.In addition,a miniaturized MHz line-wide distributed feedback semiconductor laser(10 cm^3)is used in the proposed scheme to replace the narrow-line-wide tunable laser(480 cm^3)of the conventional resonator gyros,which greatly reduces the volume and cost of gyros.The correlative theoretical analysis and design calculation have laid a solid foundation for the engineering of the proposed resonant micro-optical gyro.