荧光光纤光栅传感特性的实验研究

Experimental Research on the Sensing Properties of Fluor escent Fiber Gratings

在载氢掺铒光纤上写入Bragg光纤光栅,得到新型光子学器件荧光光纤光栅.分别对其Bragg波长(λB)及荧光寿命(τ)的温度(T)及应变(ε)响应特性进行了实验研究,并且给出了λB和τ分别关于(T,ε)的拟合方程.实验结果表明:荧光光纤光栅的λB对T和ε的响应具备一般Bragg光纤光栅的优良特性,测得温度灵敏度为11.1pm/℃,应变灵敏度为1.19pm/με;而且τ对T和ε的响应也具有良好的线性关系,温度灵敏度为0.59μs/℃,应变灵敏度为6.16ns/με.实验结论为解决温度应力交叉敏感、实现温度应力的同时监测提供一条新颖的途径.

The fluorescence fiber gratings are fabricated the structure of fiber Bragg gratings （shortly FBGs） on Hydrogen-loaded Erbium-doped fluorescence fibers. The properties of temperature and strain for λB and τ have been studied experimentally, the fitting equations for λB（T,ε）and τ（T,ε）are given. The results show,like plain FBGs, the Bragg wavelength of fluorescence fiber gratings have well properties in response to temperature and strain, the thermal and stress sensitivity is 11. 1 pm/℃ and 1. 19 pm/με. Moreover, the lifetime of fluorescence fiber gratings represent good linearity with temperature or strain changes,the thermal and stress sensitivity is 0.59 μs/℃ and 6. 16 ns/με,respectively. Finally,the results also provide novel ways of solving the cross-talking problem or simultaneously measuring of temperature and strain.