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通过对普通光纤布拉格光纤(FBG)用HF腐蚀,制作了不同直径尺寸的微纳FBG(MNFBG)用于液体折射率传感实验研究。结果表明,MNFBG的反射波长在1.33~1.43折射率范围内均随液体折射率的增大向长波方向移动,而且保持良好的二次非线性关系,最大波长灵敏度可达14.41nm/RIU;在1.33~1.38和1.38~1.43的较小折射率范围内,反射波长随折射率变化具有良好的线性关系,而且随着芯径尺寸的减小,反射波长随折射率变化的灵敏度、线性度以及线性响应范围均成递增规律。本文研究不仅拓展了FBG的功能化应用,而且为基于FBG的折射率传感器的设计、优化以及合理应用提供一定参考。
Through the HF etching of ordinary fiber Bragg fiber (FBG), different diameter size micro-nano FBG (MNFBG) was fabricated for liquid refractive index sensing experiment. The results show that the maximum wavelength sensitivity of MNFBG can reach 14.41nm / RIU with the refractive index of 1.33 ~ 1.43 and the long wavelength direction of MNFBG. ~ 1.38 and 1.38 ~ 1.43, the reflection wavelength has a good linear relationship with the change of refractive index, and with the decrease of core diameter, the sensitivity of reflection wavelength with the change of refractive index, linearity and linear response The range is an increasing law. This study not only expands the functional application of FBG, but also provides some reference for the design, optimization and rational application of FBG-based refractive index sensor.