【作者】 何周；

【导师】 李绪友；

【作者基本信息】 哈尔滨工程大学 ， 导航、制导与控制， 2009， 硕士

【摘要】 布里渊光纤陀螺作为第三代光纤陀螺,代表了光纤陀螺高精度和小型化的发展方向,它具有小型化和直接频率读出的优势,更适用于捷联惯导系统,目前在国际上只处于理论研究阶段。本文首先针对布里渊光纤陀螺的几个基础问题,如布里渊光纤陀螺的工作原理、布里渊光纤陀螺谐振腔内偏振态稳定性及阈值光功率的研究、布里渊光纤陀螺谐振腔的研究与设计、锁定现象的成因及其抑制方法研究等。本课题的具体研究内容如下:本文首先介绍了受激布里渊光纤陀螺的工作原理,在分析介绍Sagnac效应的基础上,重点分析了光纤中的受激布里渊散射效应和布里渊光纤陀螺拍频的产生机理。其次,对布里渊光纤陀螺敏感环中的偏振态稳定性和阈值光功率进行了研究,理论上推导研究了在敏感环熔接点进行偏振主轴旋转不同角度时泵浦光和受激布里渊光的谐振稳定性;分析推导了折射率呈阶跃均匀保偏光纤和折射率呈平方均匀保偏光纤的布里渊散射阈值与光纤长度和光纤纤芯半径的关系,并实验测试了布里渊光纤陀螺谐振腔的阈值。第三,对布里渊光纤陀螺谐振腔进行了研究与设计。布里渊谐振腔是布里渊光纤陀螺的核心,首先研究了光纤谐振腔的基本结构和原理,然后对谐振腔内的光强进行了分析和研究,最后设计了布里渊光纤谐振腔,并对谐振腔特性进行了测试。最后,研究了布里渊光纤陀螺的锁定效应,先分析了布里渊光纤陀螺的锁定效应及其成因,然后建立了考虑存在锁定效应的拍频公式和输入输出表达式,并对抑制锁定效应的偏频法和推拉式相位调制法作了详细的研究,最后提出了四频差动方案,并分析了其抑制锁定效应的原理和优点。更多还原

【Abstract】 As the third generation fiber-optic gyroscope, Brillouin fiber-optic gyroscope (B-FOG) is on behalf of the development direction of fiber optic gyroscope with high precision and miniaturization. Because it has the advantages of small size and frequency direct read out, so it is more applicable to the strap-down inertial navigation system, but in the international there is only research in theoretical stage. This article first researches the basic issues in B-FOG, such as the B-FOG working principle is analyzed, the B-FOG fiber ring resonator is researched and designed, the study on B-FOG threshold power and the cause of the lock-in phenomenon ,then the suppression methods of lock-in phenomenon are proposed. In detail studies as follows:Firstly, the B-FOG working principle is analyzed in depth. Based on the analysis of Sagnac effect, Stimulated Brillouin scattering effect in the optical fibers is detailed analyzed, and the beat frequency mechanism of Brillouin fiber-optic gyro is investigated.Secondly, the optical power threshold and polarization stability in B-FOG are analyzed.Theoretically studied at the stability of pumped light and stimulated Brillouin light when polarization spindle rotating at a different angle, and the formulas between threshold with fiber optical length and radius of step refractive index and square refractive index polarization maintaining fiber is presented, and the Brillouin fiber-optic gyroscope resonator threshold is tested by experiment.Thirdly, the Brillouin fiber-optic gyroscope resonator is researched and tested, the Brillouin cavity is the core of Brillouin fiber-optic gyros, the basic structure and principles are investigated initially, then the light intensity in the resonant cavity are analyzed, then the Brillouin fiber-optic resonant cavity is designed, the theoretical results are verify by experimental tests.Finally, the lock-in phenomenon in B-FOG is researched and analyzed in detail, first the causes of lock-in phenomenon is researched, then the beat frequency formula which consider the existence of lock-in phenomenon and input-output expression are established, and the partial frequency method and push-pull phase modulation were studied in detail, finally, the principles and advantages of the four-frequency differential system scheme is analyzed in detail.更多还原