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通过在单模光纤后依次熔接一段大芯径空芯光纤和一段小芯径空芯光纤,制作了一种由小芯径空芯光纤形成环形反射面的全光纤法-珀腔。由于这种环形反射面结构的中间通孔适合气体或低粘度液体进出,因此可将其应用于气体或低粘度液体的折射率测量。分析了这种结构形成光纤法-珀腔的机理,并实验研究了这种基于环形反射面的干涉式折射率传感器,得到了这种传感器用于折射率测量时的分辨率约为1.652×10-6。可以预见这种具有环形反射面的法-珀干涉式折射率传感器在有毒、易燃、易爆的气体以及低粘度液体的折射率或含量检测中具有极大的潜在应用价值。
A full-fiber Fabry-Perot cavity with a circular reflecting surface formed by a small core hollow fiber is fabricated by fusing a section of large core hollow fiber and a section of small core hollow core fiber after the single mode fiber. Due to the fact that the middle through-hole of this toroidal reflector structure is suitable for gas or low-viscosity liquid in and out, it can be applied to the refractive index measurement of gas or low-viscosity liquids. The mechanism of forming the fiber-optic chamber with this kind of structure is analyzed, and the interferometric refractive index sensor based on toroidal reflecting surface is experimentally studied. The resolution of this sensor used in refractive index measurement is about 1.652 × 10 -6. It is foreseeable that this Fabry-Perot interferometric refractive index sensor with annular reflector has great potential applications in the detection of refractive index or content of toxic, flammable and explosive gases as well as low viscosity liquids.