宽带光源光谱不对称性对光纤陀螺性能的影响

发布时间：2018-03-18 07:49

本文选题：光纤陀螺　切入点：宽带光源　出处：《中国惯性技术学报》2017年05期 　论文类型：期刊论文

【摘要】：光谱不对称性是宽带光源的非理想特性之一,这种特性对标度因数的影响在中高精度光纤陀螺中会逐渐显现出来。为了分析光谱不对称性及其对光纤陀螺的影响,结合光纤陀螺所用宽带光源的典型光谱参数,对宽带光源的光谱不对称性进行了理论计算,分析了传统量化光谱不对称性方法存在的问题和局限性,并在此基础上提出了一种更加准确合理的光谱不对称性的量化指标。研究表明,光谱不对称性会产生相对相位误差,并在调制通道中产生视在增益误差,导致陀螺第二反馈回路"错误"调整调制通道的增益,引起光纤陀螺标度因数的非线性误差。对于类矩形光谱当不对称度小于10~(-2)时,视在增益误差引起的标度因数非线性误差会达到25′10~(-6)。因此在进行光源设计时需要将光谱不对称性作为一个定量考虑的指标。
[Abstract]:Spectral asymmetry is one of the non-ideal characteristics of broadband light source, and the influence of this characteristic on scale factor will gradually appear in medium and high precision fiber optic gyroscope. In order to analyze the spectral asymmetry and its influence on fiber optic gyroscope, Combined with the typical spectral parameters of broadband light source used in fiber optic gyroscope, the spectral asymmetry of broadband light source is calculated theoretically, and the problems and limitations of the traditional method of quantifying spectral asymmetry are analyzed. On this basis, a more accurate and reasonable quantization index of spectral asymmetry is proposed. It is shown that spectral asymmetry produces relative phase error and apparent gain error in modulation channel. The gain of the modulation channel is adjusted by "error" in the second feedback loop of the gyroscope, and the nonlinear error of the scale factor of the fiber optic gyroscope is caused. The nonlinear error of scaling factor caused by apparent gain error will reach 25 ~ 10 ~ (-6). Therefore, spectral asymmetry should be considered as a quantitative index in light source design.
【作者单位】：天津航海仪器研究所;
【基金】：装备预研项目(41417010102)
【分类号】：TN96

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