基于空芯光子晶体光纤的全光纤法布里-珀罗干涉式加速度传感器

Accelerometer Based on All-Fiber Fabry-Perot Interferometer Formed by Hollow-Core Photonic Crystal Fiber

研究了一种基于悬臂梁结构的光纤法布里-珀罗干涉式加速度传感器,光纤法布里-珀罗腔是用电弧放电熔接方法将空芯光子晶体光纤(HCPCF)熔接在两根普通通信单模光纤中间而构成。这种法布里-珀罗干涉结构对应变敏感,而对温度和弯曲不敏感。理论推导了悬臂梁自由端扰度与这种法布里-珀罗干涉腔的腔长、干涉光强,以及光电探测电压之间的关系,得到了简化的加速度计算公式。实验证明这种结构测量加速度的可行性,在实验的基础上理论推导出这种系统测量加速度的分辨率约为8.42×10-7g,灵敏度为0.3386 V/g,提出了这种系统的进一步优化方法。

All-fiber Fabry-Perot accelerometer based on cantilever structure is investigated.The Fabry-Perot structure is formed by hollow core photonic crystal fibers（HCPCF） and normal single mode fiber by using simple cleaving and splicing methods.Such kind of Fabry-Perot sensing structure is sensitive to strain,but is non-sensitive to temperature and bending.We analyze the relationship between the cavity length of HCPCF Fabry-Perot and light intensity,photoelectric detector voltage and the eccentricity of the free end of cantilever.Finally,we get the simple theoretical formula of computing acceleration.Experimental results show that this kind of Fabry-Perot can be used to measure acceleration,the resolution of the measuring system is about 8.42×10^-7 g,and the sensitivity is 0.3386 V/g.