基于3×3耦合器的马赫-曾德尔干涉仪的光纤光栅波长解调技术
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2005
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Resumo |
介绍了一种基于3×3和2×2光纤耦合器构成的非平衡马赫-曾德尔干涉仪的波长解调方案。理论分析和数据对比表明,相对于由两个2×2光纤耦合器构成的马赫-曾德尔干涉仪,本干涉仪具有宽谱的灵敏度、能跟踪波长的变化方向和相位展开的优点,实验方案用于测量固定在悬臂梁上的传感光纤布拉格光栅(FBG)的峰值波长变化,获得了±1pm的静态波长解调精度,在10Hz处的动态分辨率为27nε/√Hz。相位展开算法使得应变测量范围达到了2014με,对应的相位变化为3.22π。 A wavelength interrogation scheme which based on a unbalanced Mach-Zehnde interferometer (MZI) composed by a 3×3 and a 2×2 fiber coupler was introduced. Theoretical analysis and experimental data showed that compared with MZI by two 2×2 couplers, the experiment MZI has advantages of high sensitivity in wide spectral range, and possibility of tracking wavelength change direction and phase unwrapping. The experimental set-up was used to measure the peak-wavelength change of an fiber Bragg grating (FBG) strain sensor fixed on a cantilever. The static resolution of wavelength interrogation of the set-up was measured to be ±1 pm, and the dynamic resolution to be 27 nε/Hz at 10 Hz frequency; the strain range as large as 2014 με was demodulated by a phase unwrapping algorithm, corresponding to a phase shift of 3.22π. |
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Idioma(s) |
中文 |
Fonte |
黄冲;蔡海文;耿健新;董作人;刘锐;鲍星合;瞿荣辉;方祖捷.基于3×3耦合器的马赫-曾德尔干涉仪的光纤光栅波长解调技术,中国激光,2005,32(10):1397-1400 |
Palavras-Chave | #光栅 #光纤光学 #光纤光栅传感器 #波长解调 #非平衡马赫-曾德尔干涉仪 #3×3光纤耦合器 #fiber optics #fiber Bragg grating sensor #wavelength interrogation #unbalanced Mach-Zehnder interferometer #3×3 fiber coupler |
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期刊论文 |