光纤Bragg光栅传感监测解调系统设计

Design of optical fiber Bragg grating sensor monitoring and demodulation system

采用波分和空分混合复用技术和LabVIEW,设计了一种可通过单片机控制的光纤Bragg光栅(FBG)传感监测解调系统,实现了温度和应变的实时监测。实验研究表明,在20～100℃范围内,温度监测平均误差0.3℃,标准差0.163℃,实验灵敏度与标定灵敏度之间的灵敏度误差为0.29%;在0～390με应变范围内,应变监测平均误差2.79με,标准差2.63με,悬臂梁上下FBG实验灵敏度与标定灵敏度之间的灵敏度误差分别为0.10%、0.19%。该解调系统实现了高灵活性、高精度的温度和应变监测。

A fiber Bragg grating(FBG)sensor monitoring and demodulation system controlled by SCM is designed by using WDM and space division multiplexing technology and LabVIEW,and the real-time monitoring of temperature and strain is realized.The experimental results show that the average error of temperature monitoring is 0.3℃,the standard deviation is 0.163℃in the range of 20℃to 100℃,and the sensitivity error between the experimental sensitivity and the calibration sensitivity is 0.29%.In the range of 0 to 390 strain,the average error of the strain monitoring is 2.79μεand the standard deviation is 2.63με.The sensitivity errors between the sensitivity of FBG experiment and the calibration sensitivity of cantilever beam are 0.10%and 0.19%respectively.This demodulation system realizes the temperature and strain monitoring with high flexibility and high precision.