共查询到20条相似文献,搜索用时 859 毫秒
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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. 相似文献
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As a basic velocity, DVL is introduced in the navigation solution process of Fiber Optic Gyro Strapdown Inertial Navigation System (FOG SINS). According to the special application background, DVL error is unavoidable to be introduced to navigation information that is calculated by FOG SINS. Firstly, the effect of DVL error on steady-state error of misalignment angles is derived. Secondly, the estimation method of DVL error is proposed: the DVL velocity error is calculated by attitude information, which is resolved respectively from compass solution method and inertial navigation solution method. At last, both simulations and ocean experiments verify the feasibility of the method. 相似文献
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To analyze the bias error in the optical path of closed-loop polarization-maintaining (PM) fiber optical gyroscope (FOG), the interference signal term carrying only Sagnac phase shift in phase is divided into two types: one generated by interference between main wave-trains in the clock-wise (CW) direction and counter clock-wise (CCW) direction, and the other one generated by interference between secondary wave-trains in the CW and CCW direction. The residual term is discovered in the second kind, which is caused by synthetic effect of broad-spectrum source and birefringence effect in a FOG with the existence of crossovers. The main influencing factors and the effect on FOG performance of the bias error generated by the residual term is analyzed, and its suppression measures are promoted. Simulation result demonstrates that the bias error can be suppressed from about 0.02°/h to less than 2×10−4°/h at room temperature and its peak to peak value of variation with temperature can be suppressed to less than 4×10−4°/h, through matching birefringent fiber length and increasing the delay between modes of light source, which is small enough to meet the requirement of FOG with high performance. 相似文献
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To analyze quantitatively and systematically the reflection error in optical path of closed-loop polarization-maintained (PM) fiber optical gyroscope (FOG), the optical model is established and analyzed. Based on the optical model and the principle of the coherence detection in signal processing, the source of the reflection error is disclosed from the point of wave trains, and its effect on FOG performance is analyzed in detail, including variation as the step wave on modulator and as the environment temperature. In addition, the measures are promoted to suppress the reflection error, and the simulation result demonstrates that the peak-to-peak value of the reflection error can be suppressed from about 0.8°/h to less than 6×10−3°/h through matching the length of birefringent pigtails, which is small enough to meet the requirement of FOG with high performance. 相似文献
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随着光纤陀螺研究的不断进展,对陀螺光源的稳定性的要求也越来越高。SFS(超荧光光纤光源)正是应用于高精度陀螺要求的宽带光源,它的平均波长和功率的温度稳定性直接影响着光纤陀螺的性能。从SFS的特性分析对其驱动系统进行了设计,提出并实现了温度稳定性的控制方案。 相似文献
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Effects of Polarization-Maintaining Fibre Degrading on Precision of Fibre Optic Gyroscopes in Radiation Environment 下载免费PDF全文
In the space environment, the precision of fibre optic gyroscopes (FOGs) degrades because of space radiation. Photonic components of FOGs are affected by radiation, especially the polarization-maintaining (PM) fibre coil. In relation to the space radiation environment characteristic, we have carried out a series of radiation experiments on a PM fibre coil with 6OCo radiation source at different dose rates. Bazed on the experimental results, the formula between the PM-fibre loss and radiation dose rate is built, and the relation between the precision of FOG and radiation dose is obtained accordingly. The results strongly show that the precision of our FOG degrades owing to the attenuation of the polarization-maintaining fibre, which provides theoretical foundation for the radiation-resistant design of the FOG. 相似文献
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Pan Ma Ningfang Song Jing Jin Jingming Song Xiaobin Xu 《Optics & Laser Technology》2012,44(6):1829-1833
In this paper, we investigate the birefringence of polarization maintaining photonic crystal fibers (PM-PCFs) under thermal effect. Modeling and simulation of PM-PCFs under thermal effect are conducted. Birefringence in a PM-PCF as a function of the temperature is measured experimentally. The experimental results are in agreement with theoretical calculation, and show that the relative temperature dependent birefringence coefficient of the PM-PCF, dΔn/dT/Δn, is 2.93×10?5/°C, which is typically ~35 times less than that of conventional panda fibers. The insensitivity of polarization properties in PM-PCFs to temperature is demonstrated. These findings have important benefits in fiber optic systems and sensors, especially in fiber optic gyroscopes (FOG) where it translates into a lower polarization error and thus a higher measurement precision. 相似文献
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通过对Shupe误差数学模型进行分析,确定了引起Shupe误差、导致陀螺零偏误差大的原因之一是闭环光纤陀螺光纤环温度场时空分布不均。利用Ansys Workbench与Icepark软件建立了闭环光纤陀螺敏感单元有限元热模型,并对该模型进行了瞬态与稳态温度场的仿真分析,得出通过改进陀螺外罩设计可以使光纤环温度场分布更加均匀,有助于减小Shupe误差引入的零偏误差。结合仿真结果,进一步对陀螺外罩的几种热设计方案进行了热仿真分析与定量化设计,确定了陀螺外罩的最优设计方案:当内层采用厚度为0.8 mm的软磁合金材料作为隔热层,外层采用厚度为1.5 mm硬铝材料作为均热层时,光纤环的温度时空变化率最小。通过对优化方案进行实验验证,使光纤环在降温过程中温度变化减小了1.8 ℃,使其最高最低点温度差减小了0.68 ℃。 相似文献
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《Optik》2014,125(24):7244-7246
This paper presents an accurate calibration method for drift of fiber optic gyroscope (FOG) in multi-position north-seeking phase. To avoid the effect of the rate of change of accelerometer bias on the drift estimate of FOG, north-seeking by coarse-alignment is performed in multi positions and the north-seeking results are used to compute the drift of FOG. The laboratory test results prove that the proposed method can not only achieve multi-position north-seeking, but also accurately calibrate the drift of FOG. The comparison with the traditional method highlights the superior performance of the proposed method. 相似文献
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Bias thermal stability of a fiber-optic gyroscope using polarization-maintaining photonic crystal (PM-PCF) was studied. The thermal sensitivity of birefringence in PM-PCF and polarization cross talking in fiber coil was measured. Using an OCDP method, the polarization cross talking causing phase error of the fiber-optic gyroscope (FOG) was analyzed. The contrast experiment result of the FOGs with the PM-PCF coil and PMF coil showed that using PM-PCF instead of PMF can improve the FOG’s bias thermal stability by about 50 %. 相似文献
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随机漂移是影响光纤陀螺精度的主要因素之一,建立陀螺随机漂移模型以便在滤波时加以修正是提高系统精度的有效方法。针对传统随机漂移模型建模耗时长、过敏感等问题,提出基于Allan方差的光纤陀螺随机漂移模型。通过各噪声项的功率谱密度函数推导出随机微分方程,用Allan方差分析出光纤陀螺各噪声项量化参数,将量化参数代入以单位白噪声驱动的随机微分方程,得到随机漂移模型。实验结果表明,该模型拟合出的随机漂移单项噪声误差不超过8.6%,远低于传统模型产生的单项噪声误差58.3%,是一种有效的光纤陀螺随机漂移建模方法。 相似文献
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基于温度激励的光纤陀螺光纤环瞬态特性检测 总被引:3,自引:1,他引:2
光纤陀螺基于萨尼亚克效应测量垂直于光纤环平面的敏感轴方向上的旋转分量。光纤环是光纤陀螺的核心部件,光纤环的缠绕质量直接影响着光纤陀螺的整体性能,对光纤环的缠绕质量全面检测十分必要。针对目前光纤环检测手段的局限性,提出了一种基于温度激励的光纤陀螺光纤环瞬态特性检测方法,全面表征了光纤环的缠绕质量。建立了光纤环柱面坐标三维计算模型,采用有限元方法定量分析光纤环不对称度和局部温度激励位置精度对光纤环瞬态响应的影响,同时开展了光纤环温度激励相应实验,实验结果与光纤环三维物理模型数值计算结果相一致,在理论和实验上验证了光纤环瞬态特性检测方法的可行性。 相似文献