【摘要】 对级联长周期光纤光栅(C-LPFG)的温度敏感特性进行了理论和实验研究。讨论了C-LPFG的谐振波长温度灵敏度与包层模的阶次、光纤光栅周期的关系,进行了20～80℃温度传感实验,实验结果表明,谐振波长与温度成线性响应,升降温数据的重复性比较好,测得其谐振波长温度灵敏度为0.250 1nm/℃、而相同参数的LPFG所测得的谐振波长温度灵敏度为0.131nm/℃。表明,C-LPFG的温度灵敏度远高于同样参数的LPFG。更多还原

【Abstract】 The temperature response characteristics of cascaded long period fiber grating(C-LPFG,or called as long period fiber grating pair,LPFGP) are researched theoretically and experimental.The relationships between the C-LPFG temperature sensitivity and the order of cladding mode,the period of the long period grating pair are discussed as well.The temperature sensing experiment is done with the temperature ranging from 20 ℃ to 80 ℃.The experimental results show that the C-LPFG resonant wavelength has a linear relation with the time.The data has good repeatability.The resonant wavelength′s temperature sensitivity is 0.250 1 nm/℃,while with the same parameters the LPFG′s temperature sensitivity is 0.131 nm/℃.we can see that C-LPFG temperature sensitivity is higher than that of the LPFG with the same parameters.更多还原