提出一种具有温度自校准功能的光纤折射率(RI)传感器, 传感头结构由2段很短的多模光纤(MMF)之间夹熔一段对折射率不敏感的光纤布拉格光栅(FBG)构成, 传感头总长度为14 mm, FBG可以为折射率测量提供良好的温度校准功能。实验结果证明, 该传感器的折射率灵敏度为126 nm。其干涉光谱共振波长的温度灵敏度为35.09 pm/℃, 用于温度校准的FBG的温度灵敏度为11.14 pm/℃。相比于普通的折射率传感器, 这种具有温度自校准功能的折射率传感器具有良好的实用前景。

We proposed a type of optical fiber refractive index(RI) sensor with the temperature calibration ability. The sensing head consisted of two very short lengths of multimode fiber (MMF) and a length of refractivity-insensitive fiber Bragg grating (FBG) fused between them, which had a total length of 14 mm. Here the FBG was used as the temperature calibration component for refractivity measurement. The experimental results show that the RI sensitivity of this sensor is about 126 nm, the temperature sensitivity of the resonance wavelength is 35.09 pm/℃, and the temperature sensitivity of the FBG is 11.14 pm/℃. Compared with the general refractive index sensors, this sensor with a good temperature calibration ability has better application prospect.