【作者】 胡志雄；

【导师】 武星；

【作者基本信息】 天津大学 ， 光电子技术， 2007， 硕士

【摘要】 干涉型光纤陀螺是发展最早、应用最广泛的光纤陀螺,目前其惯性级产品的研制与开发也正日趋成熟。但是,由于一些随机性、非互易性因素的影响,大大限制了其性能的提高。如何有效抑制干涉型光纤陀螺的各种噪声,从而提高测量精度,已经成为一个主要研究热点。偏振态变化和光源稳定性是影响干涉型光纤陀螺测量精度的重要因素。为了改善光纤陀螺的性能,本文围绕这两个方面开展了一系列的研究工作。首先我们建立光纤陀螺的光学模型,分析了偏振态变化对光纤陀螺的输出造成的影响。然后开发研制出消光比测试平台,并对单模保偏光纤的消光比进行了测试。我们测试了两只光纤陀螺用的光纤环在不同温度下的消光比性能,并对测试结果进行了分析。从消光比的测试我们又引申出保偏光纤的定轴问题,在了解了保偏光纤定轴的一般方法后,我们利用光的衍射基础理论对垂直照射保偏光纤的衍射进行了理论分析,并通过试验对保偏光纤的定轴提出一些比较可行的设想。光源的性能直接决定了一个光纤陀螺的好坏。我们分析了光源稳定性对光纤陀螺的影响,然后设计了SLD光源的驱动电路。在设计光源的驱动电路时,我们将APC和ATC控制相结合,采用了PID电路,除此之外还引入了一个系统温度补偿电路,得到了很好的效果。通过在不同温度下的稳定性试验,我们对光纤陀螺用的光源进行了评价与测试。更多还原

【Abstract】 Interferometric fiber optic gyroscope (I-FOG) is the earliest developed, and the most widely applied fiber gyroscope. At present, the research and development of its inertia-class products are growing maturer. However, some random and nonreciprocal factors greatly limit the improvement of its performance. How to effectively inhibit the various noise of I-FOG, thereby improving measurement accuracy, has become a major research focus.Changes of polarization and stability of light source are two important factors which greatly influence the measurement accuracy of I-FOG. In order to improve the performance of I-FOG, we focus on these two aspects to conduct a series of studies.Firstly, we established an optic model for fiber optic gyroscope and analyzed the impact of changes of polarization on the output of I-FOG. Then we developed a testing platform and successfully tested extinction ratio of the single-mode polarization-maintaining fiber. The extinction ratio of two I-FOG fiber optic ring under different temperatures was tested and the testing results were analyzed. There is a problem in testing the extinction ratio of polarization-maintaining fiber, which is how to find the axis orientation of polarization-maintaining fiber. After understanding general methods, we conducted a theory analysis on the diffraction of light perpendicularly impinging the polarization-maintaining fiber by using the optical diffraction theory, and we have proposed a number of feasible ideas.The performance of light source directly determines the measurement accuracy of a I-FOG. We analyzed the impact of stability of light source on the output of I-FOG, then we designed the drive of SLD light source. We combined Auto Power Control with Auto Temperature Control, using proportion-integral-derivative control circuit. In addition, we have also introduced a temperature compensation circuit, and the test proved to be a very good result. Through stability test under different temperatures, the performance of light source can be given a evaluation test.更多还原