环境折射率和环境温度变化是影响光纤应变测量误差的主要因素。本文利用双模光纤纤芯双模式(LP01和LP11)支持特性设计了一款环境折射率不敏感的双模光纤(DMF)长周期光纤光栅LPFG)应变传感器。设计了传感器模型结构,制作了最优化参数的传感器样品。实验测试了DMF-LPFG传感结构对外部环境中应变、温度和折射率的响应。通过在单模光纤上用紫外激光刻写的布拉格光栅(FBG)解决了环境温度的交叉影响。轴向应变实验结果表明,该新型结构传感器在0 με~840 με应变范围内其轴向应变灵敏度可以达到-5.4 pm/με,该灵敏度值相比较于普通LPFG有很大提高。温度在25 ℃~80 ℃范围内其灵敏度为58.86 pm/℃,表现出较好的线性度。同时,传感器对环境折射率变化表现出不敏感特性。通过采用双参数矩阵对少模LPFG和FBG的应变和温度灵敏度进行处理,可以实现双参数的同时解调。该新型复合光栅结构具有良好的传感性能和工程应用前景。
基于双模LPFG折射率不敏感双参量传感器
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出版日期:2021年3月22日
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参考文献
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基金项目:
国家科技攻关资助项目(61327012);国家自然科学基金资助项目(61735014);国家重大科研仪器研制资助项目(61927812);国家重点研究发展计划(2017YFB0405502)
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引用本文:
王向宇, 乔学光, 禹大宽. 基于双模LPFG折射率不敏感双参量传感器[J]. 光电工程, 2021, 48(3): 200247.