用双周期光纤光栅实现温度和应变的同时测量

介绍了光纤光栅传感器的一般原理，分析了长周期光纤光栅和Bragg光纤光栅的应变和温度响应机理。结果表明，长周期光纤光栅和Bragg光纤光栅的温度和应变灵敏度不仅与纤芯参数和光栅周期有关，还依赖于包层参数。在同一根光纤上先后写入长周期光纤光栅、Bragg光纤光栅，利用长周期光纤光栅和Bragg光纤光栅基模与包层模耦合时温度和应变灵敏度的不同，实现应变和温度的同时测量。

Simultaneous Measurement of Temperature and Strain Using a Dual-Period Fiber Grating

The general principle of fiber grating sensors is introduced,then the formula of strain and temperature response mechanism of Long Period Fiber Gratings (LPFG) and Fiber Bragg Gratings (FBG) are obtained. The results show that the temperature and strain sensitivities of LPFG and FBG not only depend on the core parameters and gratings period, but also depend on the cladding parameters. A LPFG and FBG are written into the same section of a fiber successively. In LPFG and FBG, the temperature and strain sensitivity are different when the fundamental guided mode is coupled to different cladding modes. As a result, the strain and temperature can be measured simultaneously.