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- W1567148239 abstract "由于马赫-曾德尔（Mach Zehnder）光纤干涉传感系统的定位精度在实际应用中受到初始相位偏移的影响,本文针对系统的光路结构,提出了一种基于3×3耦合器的被动数字化解调方法.利用3×3耦合器的2路输出信号构成椭圆曲线,在约束条件下对信号系数进行最小二乘拟合,然后采用微分交叉相乘法解调出相位信号.与传统的解调方法相比,提出的方法降低了对耦合器高对称性的要求,不需限制其它参数;约束条件下椭圆拟合的鲁棒性好,尤其是对于椭圆度较差的数据点具有很强的适应能力,适用于微弱振动信号的解调.仿真结果和现场实验数据证明该方法切实有效,运算量小,利用现场数据解调出的相位信号相关性达到0.992 0;互相关计算显示其在总长43 km的管道上的定位误差为81.2m,有效提高了系统性能." @default.
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- W1567148239 date "2014-01-01" @default.
- W1567148239 modified "2023-09-26" @default.
- W1567148239 title "Digitalized demodulation based on 3×3 coupler for dual Mach-Zehnder fiber interferometer" @default.
- W1567148239 doi "https://doi.org/10.3788/ope.20142206.1410" @default.
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