一种新型惯性器件—光纤陀螺

简述光纤陀螺的基本原理,介绍光纤陀螺比传统机械式陀螺所具有的特独优点,并指出全光纤陀螺和集成光学陀螺在惯性导航系统中是一种有生命力的新型惯性器件。     

高准确度光纤陀螺中相位调制的控制研究

在相位调制器基础上，提出了围绕干涉型光纤陀螺的闭环控制方案.对高准确度光纤陀螺中Y波导集成光学器件的调制特性及系统测试方法进行了研究，对其应用及光路各环节配合的技术进行了探讨，对该器件在光纤陀螺系统中的特性和测试系统进行讨论.在高准确度光纤陀螺中取得明显效果.目前，工程样机的零偏稳定性已达到0.02°/h.     

集成光学芯片的闭环光纤陀螺研究

简要分析集成光学芯片闭环光纤陀螺的构成、信号检测方法及电路实现方法。     

集成光学光纤陀螺的噪声分析

集成光学光纤陀螺以其体积小、重量轻、以及高的调制频率与消光比引起了国际上的广泛重视。深入研究光纤陀螺的噪声特性,对于降低零漂是极为重要的。通过广泛调研,从光源、光纤环与集成光学芯片、电路、以及外界环境的角度,详细的论述了各噪声源产生的机理、特征和一些抑制噪声的办法。简要的提出了一种利用负反馈补偿零漂的方法     

干涉式光纤陀螺光路系统的物理模型

光路系统的偏振误差极大地制约着光纤陀螺精度的提高。利用相干矩阵和琼斯矩阵对光纤陀螺中光学器件和熔接点的光学参数进行描述,建立了干涉式光纤陀螺光路系统的物理模型。与之前相关文献报道相比,该模型所表达的光路系统更加接近于工程实际。在此基础上,提出一种分析光学器件和熔接点缺陷,以及光路损耗对光纤陀螺偏振误差影响的新方法。该方法可以有效地分析光路系统缺陷对零偏和标度因数的影响,在工程上可作为评价干涉式光纤陀螺光路系统性能的一个途径。     

集成光学器件对光纤陀螺稳定性影响的研究

通过对集成光学器件调制特性的研究分析,指出了其调制特性影响光纤陀螺稳定性的主要原因,研究并设计了对集成光学器件调制度不稳定性进行实时跟踪补偿的方法,并对设计方案进行了实验,得到较好的实验效果,提高了光纤陀螺的稳定性.     

谐振腔马赫-曾德尔干涉集成光波导陀螺

研究了光学环形腔中的单方向传输光在光学谐振腔中传输的情况，在系统旋转角速率变化时光束会产生频移，在此基础上，设计出一种具有谐振腔马赫-曾德尔干涉集成光波导陀螺结构，可以方便地检测出系统旋转角速率与方向，其检测精度与光波导谐振腔的品质无关。和萨尼亚克集成光波导陀螺相比较，性能价格比有进一步提高的潜力。     

谐振式硅基二氧化硅集成光学陀螺的克尔噪声研究

分析了集成光学谐振式陀螺中克尔噪声的产生机理,利用导波光学理论建立了克尔噪声的数学模型,并基于此模型得出了克尔噪声对集成光学陀螺极限灵敏度影响的数学表达.分析了不同光源谱宽下谐振腔腔长与克尔噪声引起陀螺输出偏移之间的关系;针对集成光学陀螺中克尔噪声的主要产生原因-谐振腔中顺、逆时针的光强不均衡,仿真分析了系统中集成光学...     

高精度长环光纤陀螺抗振性能研究

针对高精度长环光纤陀螺在振动条件下性能下降的问题,从光路、结构和电路闭环控制的角度分析了力学环境导致光纤陀螺误差的机理,并建立了数字闭环控制的系统模型。根据分析和建模结果,提出了从光学设计、光学工艺、结构设计和优化闭环控制的方式改善光纤陀螺抗振性能的方法,并设计了优化闭环控制的增益参数改善振动环境的响应性能。优化参数后的光纤陀螺抗振性能得到了大幅度提高。试验结果证明了改进方案的正确性和有效性,实现了高精度光纤陀螺在动态环境下应用的突破。     

小型铌酸锂多功能集成光学器件

为满足小型光纤陀螺对光学器件小体积的要求,对铌酸锂多功能集成光学小型化器件的结构做了分析和优化设计。采用BPM软件分析了Y形分支波导的S形波导损耗与弯曲长度及折射率差的关系。通过调整退火质子交换的工艺参数,增加了波导对光的束缚能力;降低了小型化芯片上S形波导的弯曲损耗;去掉了原有Y形波导的输出端直波导,直接由S形弯曲波导引至输出端,在更短的芯片上得到了更长的弯曲过渡区。设计制作的芯片长度由常规的20 mm减至12.5 mm,封装后的器件长度减小到20 mm,为目前同类常规器件尺寸的2/3。设计制作的器件插入损耗典型值小于2.5 dB,全温损耗变化量小于0.2 dB。     

基于光纤陀螺的舰载光电系统零值自跟踪稳定方式研究

从光纤陀螺的固有特性入手,结合舰载光电系统实现瞄准线稳定的需求,对基于光纤陀螺的瞄准线稳定控制系统进行了分析研究。针对船摇类扰动的作用机理,提出了基于速率光纤陀螺的舰载光电系统零值自跟踪的瞄准线稳定方法。     

光纤陀螺技术发展及军需分析

介绍光纤陀螺技术的发展和应用情况,分析武器系统对光纤陀螺的需求。     

表面等离子体波光纤传感器应用于复合材料固化监测的研究

对适用于机敏结构的表面等离子体波光纤传感器进行了初步的研究。将这种光纤传感器埋入复合材料结构就构成了所谓机敏结构。这种机敏结构既可进行复合材料的固化监测,又可进行应变检测。有利于传感器数量的减少和布置的简化,减少了传感元件的埋入对结构本身性能的影响。可以充分发挥光纤传感器对结构进行全过程监测的优点,具有广泛的应用前景。     

Study of fiber optic sugar sensor

Over the last two decades, the fiber optic technology has passed through many analytical stages. Some commercially available fiber optic sensors, though in a small way, are being used for automation in mechanical and industrial environments. They are also used for instrumentation and controls. In the present work, an intensity-modulated intrinsic fiber optic sugar sensor is presented. This type of sensor, with slight modification, can be used for on-line determination of the concentration of sugar content in sugarcane juice in sugar industry. In the present set-up, a plastic fiber made of polymethylmethacrylate is used. A portion of the cladding (1 cm, 2 cm, 3 cm) at the mid-point along the length of the fiber is removed. This portion is immersed in sugar solution of known concentration and refractive index. At one end of the fiber an 850 nm source is used and at the other end a power meter is connected. By varying the concentration of sugar solution, the output power is noted. These studies are made due to the change in refractive index of the fluid. The device was found to be very sensitive which is free from EMI and shock hazards, stable and repeatable and they can be remotely interfaced with a computer to give on-line measurements and thus become useful for application in sugar industries.     

Fiber optic sensor interface standardization

The need for a new avionic interconnection scheme that can provide superior performance, installability and maintainability as compared with copper has become evident. Fiber optics, which has been proposed for this role, is expected to improve environmental immunity, decrease system weight, and increase bandwidth. It has also been suggested that sensors based on fiber optics can offer significant advantages in aerospace applications. Realizing these advantages is a difficult challenge because mature sensing technologies have done a good job at reasonable cost. Furthermore, it has been demonstrated that a wide variety of aircraft electrical sensors can be addressed by a few standard interfaces. Therefore, future fiber optic sensor suites will also need to be interrogated through only a few standard interfaces, and standardization of the fiber optic sensor interface will be a primary issue in furthering fiber optic sensing technology for aerospace applications. This paper discusses the fiber optic sensor standardization process underway in the Avionic Systems Division of the Society of Automotive Engineers.     

Novel All Digital Scheme for Open Loop Fiber Optic Gyroscopes

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Performance comparison of slow‐light coupled‐resonator optical gyroscopes

We investigate the connection between group velocity and rotation sensitivity in a number of resonant gyroscope designs. Two key comparisons are made. First, we compare two conventional sensors, namely a resonant fiber optic gyroscope (RFOG) and an interferometric fiber optic gyroscope (FOG). Second, we compare the RFOG to several recently proposed coupled‐resonator optical waveguide (CROW) gyroscopes. We show that the relationship between loss and maximum rotation sensitivity is the same for both conventional and CROW gyroscopes. Thus, coupling multiple resonators together cannot enhance rotation sensitivity. While CROW gyroscopes offer the potential for large group indices, this increase of group index does not provide a corresponding increase in the maximum sensitivity to rotation. For a given footprint and a given total loss, the highest sensitivity is shown to be achieved either in a conventional RFOG utilizing a single resonator, or a conventional FOG.     

A Differentiating Fiber-optic Ring Interferometer

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