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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。
A fiber Fabry-Perot interferometric accelerometer based on a cantilever beam structure is proposed. The fiber Fabry-Perot cavity is fabricated by arc-welding a hollow core photonic crystal fiber (HCPCF) Single-mode fiber in the middle and form. This Fabry-Perot interference structure is strain sensitive and insensitive to temperature and bending. The relationship between the free end disturbance of cantilever beams and the cavity length, the interference light intensity and the photoelectric detection voltage of this Fabry-Perot interference cavity is derived theoretically. The simplified formula of acceleration calculation is obtained. Experiments show that this kind of structure can measure the feasibility of acceleration. On the basis of experiment, the resolution of this system is deduced theoretically. The resolution of this system is about 8.42 × 10-7g with a sensitivity of 0.3386 V / g. The system is further optimized method.