反射光谱力量和在坡度紧张下面的纤维布拉格栅栏(FBG ) 的带宽被研究并且试验性地示威了。坡度种类在 FBG 上被使用,它能导致拓宽的 FBG 带宽,导致反射力量的变化。基于夫妇模式理论和转移矩阵方法,在坡度种类之间的部分线性关系,反射力量,和带宽被模仿并且分析,并且反射光谱上的 FBG 长度的影响被分析。在实验,严格的坡度污点设备被设计;试验性的结果显示反射眼的力量和在坡度污点下面的 FBG 的带宽涉及 FBG 的长度。试验性的结果与理论分析很好一致,它有重要指导在 FBG 的意义动态察觉到。
The reflective spectrum power and the bandwidth of the fiber Bragg grating (FBG) under gradient strain are researched and experimentally demonstrated. The gradient strain is applied on the FBG, which can induce FBG bandwidth broadening, resulting in the variation of reflective power. Based on the coupled-mode theory and transfer matrix method, the segmental linear relationship between the gradient strain, the reflective power, and the bandwidth is simulated and analyzed, and the influence of the FBG length on the reflective spectrum is analyzed. In the experiment, the strict gradient stain device is designed; the experimental results indicate that the reflective optic power and the bandwidth of the FBG under gradient stain are concerned with the length of the FBG. Experimental results are well consistent with the theoretical analysis, which have important guiding significance in the FBG dynamic sensing.