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为了研究双折射率对双折射光纤环境轴向应变灵敏度的影响,选取双折射应变系数相同,双折射率不同的双折射光纤,通过数值模拟得到轴向应变灵敏度随双折射率变化的趋势。模拟结果表明轴向应变灵敏度随着双折射率增加而减小。实验选取不同双折射率光纤构建光纤环境轴向应变传感器,进行应变灵敏度对比实验,将获取的双折射率、轴向应变灵敏度数据进行曲线拟合,实验拟合曲线与仿真曲线呈现良好的一致性。结果表明,选择双折射率较小的双折射光纤作为敏感元件可以提高双折射光纤环境轴向应变灵敏度,但是双折射率存在一定下限,否则将产生微弱的干涉光谱而无法进行轴向应变测量。
In order to study the influence of birefringence on the axial strain sensitivity of birefringent fiber, birefringent fibers with the same birefringence strain and different birefringence were selected to obtain the change of axial strain sensitivity with birefringence. The simulation results show that the axial strain sensitivity decreases with increasing birefringence. In the experiment, different birefringence optical fibers were used to construct the optical fiber axial strain sensor, and the strain sensitivity was compared with the experimental data. The obtained birefringence and axial strain sensitivity data were curve fitted. The fitting curve and simulation curve showed good agreement . The results show that the birefringent fiber with smaller birefringence can be used as sensitive element to improve the axial strain sensitivity of birefringent fiber. However, there is a certain lower limit of birefringence. Otherwise, the interference spectrum will be weak and the axial strain can not be measured.