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理论上推导了光纤法布里-珀罗复合结构传感器的反射光谱条纹对比度与外界介质折射率的关系,并分析了实验参数对传感器灵敏度的影响.利用化学腐蚀渐变折射率多模光纤制作了光纤法布里-珀罗复合结构折射率传感器,空气中的条纹对比度可达30dB以上,折射率测量的灵敏度达45dB/RIU(refraction index unit,简RIU)以上.实验结果与理论符合很好.通过理论和实验分析,提出了进一步提高传感器灵敏度的方法.
The relationship between the contrast ratio of the reflection spectrum of the fiber Fabry-Perot composite sensor and the refractive index of the medium is theoretically deduced, and the influence of the experimental parameters on the sensitivity of the sensor is analyzed.The graded index multi-mode fiber with chemical etching is used to fabricate the fiber The Fabry-Perot composite structure refractive index sensor has a stripe contrast ratio in the air of more than 30 dB and a refractive index measurement sensitivity of 45 dB / RIU or more, and the experimental results are in good agreement with the theory Theoretical and experimental analysis, put forward to further improve the sensitivity of the sensor.