保偏布喇格光纤光栅传感特性研究

摘要

Based on the theoretical analyses of sensing characteristics in polarization-maintaining fiber Bragg grating (PMFBG), temperature and axial-strain experiments were carried out. The experiments verified the conclusions of the theoretical analyses:PMFBG shows a linear trend (over than 0.99) under the change of temperature or axial-strain.The temperature-sensitive coefficients of its two polarization direction were 0.01189 nm/°C and 0.01132nm/°C.The axial-strain-sensitive coefficients of its two polarization direction were 0.00470 nm/N and 0.00450nm/N.It is shown that fast-axle and slow-axle have different rates with ambient temperature or axial-stress changes. And this can be used to solve the problem of cross-sensitivity.%对保偏布喇格光纤光栅(PMFBG)的温度和应力传感特性理论分析和实验.得到PMFGB在温度或轴向压力的作用下双峰均呈现线性变化趋势,拟合度在0.99以上,快慢轴的温度敏感系数分别为0.01189nm/℃和0.01132nm/℃,轴向应力敏感系数分别为0.00470nm/N和0.00450nm/N.结果表明,PMFBG的在温度和应力的作用下快慢轴变化速率不同,可以解决温度应力交叉敏感问题.