论文部分内容阅读
基于尾纤端面镀金属反膜的单根长周期光纤光栅,提出了一种包层部分腐蚀的长周期光纤光栅迈克耳孙干涉仪结构,提高了长周期光纤光栅(LPFG)的灵敏度。应用干涉原理,得出了长周期光纤光栅迈克耳孙干涉仪干涉波峰随外界环境折射率的变化关系。并从实验上对腐蚀前的长周期光纤光栅迈克耳孙干涉仪和带腐蚀结构的长周期光纤光栅迈克耳孙干涉仪的折射率传感灵敏度进行对比。结果表明,包层部分腐蚀的长周期光纤光栅迈克耳孙干涉仪反射谱中的干涉峰值对折射率传感的灵敏度得到了显著的提高,对于折射率为1.333和1.352的液体,干涉峰值的移动量从0.9 nm增加到3.4 nm。
Based on a single long-period fiber grating with metallized anti-film on the pigtail end face, a long-period fiber grating Michelson interferometer with a partially eroded cladding layer is proposed to improve the sensitivity of long period fiber grating (LPFG). By using the principle of interference, the relationship between the interference peaks of the long-period fiber grating Michelson interferometer with the refractive index of the external environment was obtained. The sensitivity of the Michelson interferometer and the long-period fiber grating Michelson interferometer with corrosive structure are compared experimentally. The results show that the sensitivity of the interference peak in the reflection spectrum of the partially eroded long-period fiber Bragg grating Michelson interferometer to refractive index sensing has been significantly improved. For the liquid with refractive index of 1.333 and 1.352, the shift of the interference peak The amount increased from 0.9 nm to 3.4 nm.