光源偏振度对光纤陀螺零漂影响的研究

以Y波导集成光学调制器保偏型干涉式光纤陀螺作为研究对象,根据各光学元器件的参数建立了各器件的琼斯矩阵以及光路传输模型,在此基础上进行了光路偏振误差的理论分析。通过推导,得到了保偏型干涉式光纤陀螺的偏振误差表达式,并首次分析了光源偏振度对光纤陀螺零漂的影响。借助光源尾纤输出的光谱,对由0%~3%之间呈线性变化的偏振度以及对经实验测试的光源偏振度的实际值引起的偏振模式耦合误差的零漂值进行了仿真计算。结果表明,当光路中其它参数不变时,由光源偏振度变化引起的零漂值为0.001°/h,满足了高精度光纤陀螺的精度要求。     

激光陀螺磁灵敏度特性研究

分析、计算了激光陀螺的磁灵敏度特性,并进行了磁灵敏度试验.试验结果及分析表明：在腔体加工准确度不变的情况下,采用合理的设计可以大大降低激光陀螺在某些方向上的磁灵敏度,同时磁试验结果对于设计激光陀螺的磁屏蔽结构具有一定的实用价值.     

振动陀螺仪单向时滞耦合系统的摄动分析

针对振动陀螺仪单向时滞耦合系统,研究了角速度、耦合强度、耦合时滞与系统输出信号之间的关系,着重关注耦合时滞对待检测角速度测量结果的影响．本文采用摄动法对振动陀螺仪单向时滞耦合系统进行理论分析,得到了系统输出信号、系统振动边界和待检测角速度的近似表达式,并将数值和近似计算结果进行了对比．理论分析结果与数值结果比较吻合,验证了运用摄动法分析振动陀螺仪单向时滞耦合系统的有效性,也表明了在运用摄动法分析系统时具有局限性．     

速率光纤陀螺寻北仪倾斜补偿算法研究

针对速率光纤陀螺寻北仪,提出了一种倾斜补偿算法.通过采用积分滑动和最小二乘拟合滤波技术,对光纤陀螺和加速度计原始测量信号进行数据处理.试验数据表明,采用本算法解决了由倾斜角存在影响其寻北准确度的关键技术问题.同时给出了提高光纤陀螺寻北仪的准确度的可能因素.     

光纤激光陀螺线宽压缩技术中滤波器的结构设计与分析

研究了光纤激光陀螺系统中滤波器对激光光谱线宽压缩的影响。在理论分析的基础上,提出了用于光纤激光陀螺的Fabry Perot腔滤波器的方案,并进行了结构设计。试验证明FP腔滤波器可以达到满意的滤波效果。     

Distributed temperature measurement using a Fabry-Perot effect based chirped fiber Bragg grating

A temperature distribution sensing system based on the reflection spectrum of a 70 mm apodized chirped fiber Bragg grating has been demonstrated. Reflection variations created by the Fabry-Perot effect due to the intra-grating wavelength shift are presented. By fitting a parametric transfer matrix model of the grating response to measured spectra, the temperature change, position and width of a localized temperature change are obtained. This system is particularly attractive of its simplicity, high spatial resolution and ability in measuring a non-monotonic distribution. Experiments to measure two localized heating regions along the grating indicate that the technique is promising for measuring more complex temperature profiles.     

微型光波导陀螺中无源环形谐振器研究

光波导无源环形谐振器是微型光波导陀螺的核心敏感部件，其性能直接影响陀螺的极限分辨率和各误差项，是此种陀螺设计和制造中的关键。本文通过理论分析，对无源环形谐振器进行了深入的研究，提出了可行的光学系统设计，并结合现有先进的光学工艺，提出了加工与制造的方案。     

Fundamentals of the interferometric fiber-optic gyroscope

This paper reviews the basics of the interferometric fiber-optic gyroscope: fundamental principle based on Sagnac effect, importance of reciprocity and single-mode propagation, analysis of coherence and polarization problems, signal processing techniques. It also describes the technological progresses of guided-wave components (single-mode optical fiber, semi-conductor diode source, integrated optics, in-line fiber components). Finally, recent trends like multi-axis configurations and rare-earth doped fiber source are presented.     

自适应陷波器在机抖激光陀螺信号处理中的应用

首先利用极零点受限自适应陷波器对二频机械抖动激光陀螺输出信号利用预处理,然后再进行低通滤波器处理的方法,不仅有效地消除了抖动输出,而且减小了由FIR滤波器引起的时间延迟。     

Reduced minimum configuration fiber optic gyro for land navigation applications

Further cost reduction of the fiber optic gyroscope is necessary in order to meet the economic requirements of land navigation systems. We have previously concentrated on the reduction of the number of splices and component improvements in the open-loop, minimum configuration. Now we eliminate nonessential components and splices. The source-detector coupler is not part of the Sagnac interferometer and serves solely to provide isolation between the broadband optical source and the photodetector. Many commercial laser diodes incorporate a back-facet photodetector to monitor laser intensity. The signal returned from the Sagnac interferometer traverses the laser, is received at this photodetector, and can be distinguished from the laser signal by the bias modulation. Configuring a gyro in this manner eliminates a directional coupler and the separate photodetector as well as up to three fiber splices in an all-fiber gyroscope. A production, open-loop, fiber optic gyroscope has been modified to demonstrate this principal. The gyroscope can be constructed with only two fiber splices and exhibits performance comparable to the conventional minimum configuration.