基于弯曲损耗的光纤环路温度传感器

Fiber temperature sensor based on bent loss

为实现高精度光纤温度传感,本文对新型光纤环路温度传感器进行研究。该传感器通过折射率的改变感知环境温度变化,并直接影响到光在光纤中的传输损耗。通过分析温度、弯曲半径对折射率的影响,即弹光效应和热光效应。给出了传输损耗、测温范围与弯曲半径的关系,并依此进行了测温精度和稳定性实验,实验结果表明,功率型光纤环路温度传感器具有精度较高、成本低、易于集成等优点。

In order to achieve high precision temperature sensing,a new fiber temperature sensor is studied.The change of the environment temperature is perceived through the refractive index change,and this directly affects the transmission loss of light propagating in optical fiber.The influence of temperature and bent radius on refractive index is analyzed,namely the photoelastic effect and thermo-optic effect.The relationship between transmission loss,temper-ature range and the bending radius is obtained.Based on this,the accuracy and stability experiments of the measuring temperature is done,the experiment results show that the power optical fiber temperature sensor has a high accuracy, low cost,ease of integration,and so on.