光纤布喇格光栅低温传感的特性研究

Study on the Characteristic of Fiber Bragg Grating Sensing in Low Temperature

从光纤布喇格光栅的温度传感模式出发,对光纤布喇格光栅的温度传感特性进行了分析,推导出了光纤光栅的一阶与二阶温度灵敏度系数,并运用MATLAB对实验数据进行了拟和,所得多项式和理论值吻合得很好.并对低温传感进行了实验,将在常温下得出的多项式进行了热光系数的修正,所得的结果同时符合常温与低温的传感特性,解决了低温与常温情况下的理论计算与实验的不一致性.

The theory temperature sensing experimental finding of Fiber Bragg grating （FBG） temperature sensing is presented,the character of FBG is analyzed. It is deduced the sensitivity coefficients of first-order and second-order, and s is protracted by the MATLAB. The gaine theory value. The experiment is processed in the low temperature in the polynomial of the and low temperature. It with the temperature. no is rmal temperature,the result is accorded resolved that the theory account of the d polynomial better inosculate with ,the thermo-optic coefficient is emen with the sensing character of the nor ded mal normal and low temperature is not agree