谐振式光学陀螺闭环锁频关键技术

发布时间：2018-06-01 14:50

本文选题：谐振式光学陀螺 + 调制解调　；参考：《中北大学》2015年硕士论文

【摘要】：谐振式光学陀螺具有寿命长、可靠性高、参数稳定性好等特点。工作原理决定了谐振式光学陀螺具有小型化潜质,用其构建的惯性系统具有质量轻、体积小、功耗低等优势。相关器件在微纳卫星惯性导航制导、姿态测量与姿态稳定、以及油井测斜、大坝测斜、大地测量和振动测量等相关领域具有广泛的应用价值,对谐振式光学陀螺的深入研究具有十分重要的科学意义。谐振式光学陀螺是基于Sagnac效应,通过对经过微腔顺、逆时针传输的光束进行频率差检测,从而实现对角速度的精确测量。由载体旋转引起的谐振频差极其微弱,而其动态范围谐振频差都很大,光学腔对温度、磁场等环境因素非常敏感；在大动态范围的谐振频差下实现高精度的频差检测较困难。目前,常用的解决方法是采用闭环跟踪锁频技术锁定光纤环形谐振腔内顺逆时针传输的光路中的一路信号,利用相关检测技术实现对另一路微弱信号的提取,因此,对光纤环形谐振腔频率的锁定技术的研究显得尤为重要。本文对传统模拟锁相放大器进行了改进,采用双相位锁相放大器电路,对调制透射谱波进行解调；数字锁频电路根据某一光路解调信号来实现频率的跟踪锁定。对快速跟踪锁频系统的性能进行了测试,结果表明,系统工作稳定,激光器频率能被锁定到设定光路的谐振频率上,可以满足R-FOG系统的测试需求。
[Abstract]:The resonant optical gyroscope has the advantages of long life, high reliability and good parameter stability. The working principle determines that the resonant optical gyroscope has the potential of miniaturization, and the inertial system constructed by it has the advantages of light weight, small volume and low power consumption. The related devices have been widely used in inertial navigation guidance, attitude determination and attitude stabilization, as well as oil well slant, dam slant, geodetic and vibration measurement and so on. The research of resonant optical gyroscope is of great scientific significance. The resonant optical gyroscope is based on the Sagnac effect. The accurate measurement of angular velocity is realized by detecting the frequency difference of the beam propagating counterclockwise through the microcavity. The resonant frequency difference caused by the carrier rotation is very weak, but the resonant frequency difference in the dynamic range is very large, the optical cavity is very sensitive to the environmental factors such as temperature, magnetic field, and it is difficult to realize the high precision frequency difference detection under the large dynamic range resonance frequency difference. At present, the common solution is to use the closed-loop tracking and frequency locking technique to lock one signal in the optical path in the optical circuit of the optical fiber ring resonator, and to extract the weak signal of the other path by using the correlation detection technology. It is very important to study the frequency locking technique of fiber ring resonator. In this paper, the traditional analog phase-locked amplifier is improved, and the modulation transmission spectrum is demodulated by using the dual-phase phase-locked amplifier circuit, and the digital frequency locking circuit realizes the frequency tracking and locking according to a certain optical demodulation signal. The performance of the fast tracking frequency locking system is tested. The results show that the system works stably and the laser frequency can be locked to the resonant frequency of the set optical path, which can meet the testing requirements of the R-FOG system.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253

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