光纤陀螺光纤环分布偏振耦合误差预估 
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Estimation of Distributed Polarization Coupling Error in Optical Fiber Coil of Fiber Optic Gyroscope
北京航空航天大学仪器科学与光电工程学院, 北京 100191
图 & 表
图 1. 光纤环分布偏振耦合测试系统
Fig. 1. Test system for distributed polarization coupling in optical fiber coil
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图 2. 单PCs测量值曲线
Fig. 2. Measurement curve of single PCs
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图 3. 存在双PCs时的波列
Fig. 3. Wave trains of two PCs
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图 4. PCs测量数据。(a)对数坐标;(b)线性坐标
Fig. 4. PCs measurement data. (a) Logarithmic coordinate; (b) linear coordinate
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图 5. 测量值与计算值对比。(a)单偏振耦合点;(b)三偏振耦合点
Fig. 5. Comparison of measured and calculated values. (a) Single PCs; (b) three PCs
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图 6. 计算流程
Fig. 6. Flow chart of calculation
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图 7. 计算前后对比曲线
Fig. 7. Contrast curves of before and after calculation
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图 8. 光纤环二次偏振耦合误差模型。(a)光纤环简化模型; (b)图8(a)虚线框放大图
Fig. 8. Secondary polarization coupling error model of optical fiber coil. (a) Simplified model of optical fiber coil; (b) enlarged drawing of dotted box in Fig. 8(a)
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图 9. 光纤环测试与分析系统
Fig. 9. Test and analysis system for optical fiber coil
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图 10. 零漂预估与测试结果。(a)光纤环1号;(b)光纤环2号
Fig. 10. Estimated and measured results of bias drifts. (a) Fiber coil 1; (b) fiber coil 2
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表 1PCs数据划分
Table1. Data partitioning of PCs
| Serial number | Data type | Typical legend | Basic criterion | Handling method |
|---|
| 1 | Residual noise | | Having peak, width is not larger than 2ld | Elimination | | 2 | Single PCs | | Having peak, width is about 2ld | Direct extraction | | 3 | Multiple PCs | | Multiple peaks, width is lower than 2ld | Initialing solving equations |
|
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表 21号光纤环零漂预估与测试结果
Table2. Estimated and measured bias drifts of optical fiber coil 1
| Temperature /℃ | φsum /(10-7 rad) | ΩED /[10-3 (°)·h-1] | ΩMD /[10-3 (°)·h-1] | ΩOri /[(°)·h-1] |
|---|
| -30 | 8.38 | 2.17 | 2.48 | 0.0846 | | -10 | 7.62 | 1.97 | 2.15 | 0.0631 | | 25 | 5.06 | 1.26 | 1.74 | 0.0542 | | 40 | 6.31 | 1.72 | 2.08 | 0.0843 | | 60 | 8.15 | 2.13 | 2.39 | 0.0746 |
|
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表 32号光纤环零漂预估与测试结果
Table3. Estimated and measured bias drifts of optical fiber coil 2
| Temperature /℃ | φsum /(10-7 rad) | ΩED /[10-3 (°)·h-1] | ΩMD /[10-3 (°)·h-1] | ΩOri /[(°)·h-1] |
|---|
| -30 | 7.45 | 1.93 | 2.13 | 0.0849 | | -10 | 7.19 | 1.86 | 1.99 | 0.0651 | | 25 | 5.46 | 1.36 | 1.65 | 0.0544 | | 40 | 6.57 | 1.52 | 1.88 | 0.0562 | | 60 | 7.23 | 1.89 | 2.06 | 0.0983 |
|
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谢泽, 杨远洪, 闫晗, 杨福铃. 光纤陀螺光纤环分布偏振耦合误差预估[J]. 中国激光, 2017, 44(10): 1006004. Xie Ze, Yang Yuanhong, Yan Han, Yang Fuling. Estimation of Distributed Polarization Coupling Error in Optical Fiber Coil of Fiber Optic Gyroscope[J]. Chinese Journal of Lasers, 2017, 44(10): 1006004.
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