布拉格光纤光栅传感器的温度响应研究

在非均匀温度分布的作用下，布拉格光纤光栅的主要参数有效折射率和光栅周期都会发生非均匀的变化。同均匀温度分布相比，光纤光栅的反射光谱结构会发生变化。在光波导模耦合理论的基础上，建立了布拉格光纤光栅在非均匀温度场下反射谱的分析数学模型，利用龙格—库塔法对其进行数值求解。给出了几种典型温度分布下的布拉格光纤光栅反射谱，分析了它们的特点。

Response of Optical Fiber Bragg Grating Sensors in Temperature Fields

When optical fiber Bragg grating (FBG) sensors are subject to non homogeneous temperature distribution, the response of FBG reflective spectrum will change due to both the fiber core index and the grating pitch will experience non homogeneous variation. Based on couple modes equations, the mathematical model of the response of FBG reflective spectrum to non homogeneous temperature fields is established, and Runge Kutta numerical method is utilized to gain numerical result. The response of FBG reflective spectrum in some typical non homogeneous temperature distribution is showed and the character of them is analyses.