长光纤腔低调制频率的谐振式光纤陀螺偏振误差和锁定控制研究

发布时间：2018-01-22 10:09

本文关键词： 谐振式光纤陀螺偏振误差低频调制锁定控制　出处：《浙江大学》2017年硕士论文　论文类型：学位论文

【摘要】：谐振式光纤陀螺(RFOG)的研究已经有几十年的历史,但一直以来都处于实验室研究阶段,在工程上可行的实现方案往往太过复杂而使系统显得庞大,而简单的实现方案其性能指标往往达不到实用性要求。谐振式光纤陀螺与干涉式光纤陀螺(IFOG)相比,其优点是只需要几十分之一的光纤长度即可实现相同的散粒噪声极限灵敏度,与之相关的谐振式微光陀螺(RMOG)由于能够光学集成,在系统小型化方面具有巨大潜力,因此相关课题的研究具有重要的意义和价值。在本文描述的实验平台上,通过选取合适参数的光学器件,构造出调制频率在20kHz~30kHz附近的谐振腔结构,与传统的数百kHz甚至MHz级别调制频率的结构相比,这种结构由于较窄的谐振线宽,而具有更高的散粒噪声探测灵敏度,存在一定的潜在价值。由于当前激光器线宽级别限制或相位噪声的影响,更窄的谐振线宽在当前技术机理下难以实现环路锁定,从而不具有研究的可行性。研究的内容包括:(1)给定器件参数条件下基本参数的计算和测定,包括系统白噪声影响下的实际线宽,环路特征频率和纤细度,调制解调方案相关参数等;(2)理论分析由于器件特性、器件加工以及偏振特性引入的影响Sagnac相移的各种光学噪声;(3)理论分析并实验验证环路锁定的反馈控制相关原理和参数,提出一定准则下存在最优的PI参数组合,且具有较大的鲁棒性;(4)通过高频调制的方案精确测定了谐振腔的自由谱宽。
[Abstract]:The research of resonant fiber optic gyroscope (RFOG) has a history of several decades, but it has been in the laboratory research stage all the time. The feasible project in engineering is too complicated to make the system appear huge. The performance of the simple scheme is often not up to the practical requirements. The resonant fiber optic gyroscope (Rfog) is compared with the interferometric fiber optic gyroscope (IFOG). The advantage of RMOG is that it requires only a fraction of the fiber length to achieve the same shot noise limit sensitivity, which is associated with the resonant LLL gyroscope (RMOG) because of its optical integration. It has great potential in the miniaturization of the system, so the research of related topics has important significance and value. On the experimental platform described in this paper, by selecting the appropriate parameters of optical devices. The resonant cavity structure with modulation frequency of 20kHz ~ 30kHz is constructed. Compared with the traditional structure of hundreds of kHz and even MHz modulation frequency, this structure is due to narrower resonant linewidth. But it has higher detection sensitivity of granular noise, which has some potential value, because of the current laser linewidth limit or the effect of phase noise. The narrower resonant linewidth is difficult to realize the loop locking under the current technical mechanism, so it is not feasible to study. The research content includes the calculation and measurement of the basic parameters under the given device parameters. Including the actual line width under the influence of system white noise, loop characteristic frequency and fineness, modulation and demodulation scheme related parameters and so on; (2) A theoretical analysis of various optical noises that influence the phase shift of Sagnac due to the characteristics of the device, device fabrication and polarization characteristics; (3) theoretical analysis and experimental verification of the feedback control theory and parameters of loop locking are carried out, and the optimal Pi parameter combination under certain criteria is proposed, and it is robust. The free spectrum width of the resonator is accurately measured by the scheme of high frequency modulation.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN96

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