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为获得性能优良的熔锥型光纤耦合器.利用740FT-IR显微红外光谱仪,研究了不同制作工艺条件下耦合器中石英玻璃结构的差异。测定了在不同拉伸速度时制作的光纤耦合器,石英玻璃在650.2000cm^-1波数范围内的红外吸收光谱.观察到了石英光纤玻璃的两个特征峰,由Si-O-Si反对称伸缩振动引起的特征峰940.950cm^-1和由Si-O-Si对称伸缩振动引起的特征峰770—780cm^-1。由于工艺条件的不同,特征峰的强度和位置都发生了变化,并测量了其变化的大小。拉制速度越快,石英玻璃中Si-O-Si键的不对称伸缩振动越强.且波数的移动与光纤耦合器的性能密切相关。 相似文献
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Through theoretical analysis and experiments, the viscoelastic mechanical model of optical fiber coupler in the process of fused biconical taper was established, and the numerical analysis in non-uniform temperature field was made. The results show that the rheological parameters, such as drawing speed and fused temperature, have a tremendous influence on stress distribution and performance of optical fiber coupler, especially the influence of fused temperature. The change of fused temperature by 5 ℃ can lead to the change of the maximum stress by 30% and stress difference by 20% in the same cross section. The change of temperature gradient by 3% can result in the change of stress difference by 90%. In the present condition of rheological technology, rheological defects such as crystallizations and microcracks are easy to generate in the optical fiber coupler. 相似文献
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热挤压模具的失效工程分析 总被引:4,自引:0,他引:4
用传统方法校核模具强度时,能得出带有普遍意义的分析结果,但计算结果与实际结果有差异。本文利用有限元法对热挤压模具进行了计算和分析,计算结果与实际情况相当吻合,对模具结构优化设计有重要的参考价值。 相似文献
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