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利用光栅效应和保偏光纤的双折射效应相消原理,设计并制备了一种折射率不敏感温度传感器。传感器由写在熊猫保偏光纤(PMF)上的倾角为45°的长周期光纤光栅(LPFG)对构成。实验结果表明,当满足特定条件时随着环境折射率的变化,谐振波长零漂移;随着环境温度的升高,谐振波长向长波方向漂移,温度灵敏度高达37pm/℃,高于报道的螺旋型折射率调制级联光栅对(温度灵敏度为30pm/℃),三倍于Bragg光栅的温度灵敏度(10pm/℃)。这种结构具有的折射率不敏感性,特别适用于生产过程中液体的温度测量,而不必考虑折射率和温度的交叉敏感性。
Using the principle of grating effect and the principle of birefringence of PM fiber, a refractive index insensitive temperature sensor is designed and fabricated. The sensor consists of a long-period fiber grating (LPFG) pair written at an angle of 45 ° on a Polaroid PM fiber. The experimental results show that the resonant wavelength changes with the change of ambient refractive index and the zero drift. When the ambient temperature rises, the resonant wavelength shifts to the long-wave direction, and the temperature sensitivity is as high as 37 pm / Refractive index modulation cascaded grating pairs (temperature sensitivity of 30 pm / C), three times the temperature sensitivity of Bragg gratings (10 pm / C). This structure has the refractive index insensitivity, especially suitable for the production of liquid temperature measurement, without having to consider the refractive index and temperature cross-sensitivity.