论文部分内容阅读
采用耦合模理论分析了光纤布拉格光栅(FBG)反射偏振相关损耗(RPDL)峰位置与轴向力和侧向力的关系,进而通过相关灵敏度系数矩阵,应用单根FBG实现对轴向力和侧向力的同时测量,从而得到结构体内部二维力及二维应变信息。实验测得,(RPDL)左峰和右峰的轴向力灵敏度分别为0.986 2nm/N和0.986 7nm/N,侧向力灵敏度分别为0.007 1nm/N和0.000 5nm/N,轴向力和侧向力测量精度分别为±0.01N和±0.51N。本文方法核心传感元件简单,稳定性好,精度高,易于实现,为检测材料内部结构变化提供了新方法。
The coupling mode theory was used to analyze the relationship between RPDL peak position and axial force and lateral force of fiber Bragg grating (FBG), and then the correlation coefficient of sensitivity coefficient matrix Simultaneous measurement of force to obtain the structure of two-dimensional force and two-dimensional strain information. The experimental results show that the axial force sensitivity of RPDL is 0.986 2nm / N and 0.986 7nm / N for the left and right peaks, respectively. The lateral force sensitivity is 0.007 1nm / N and 0.0005nm / N, respectively. To the force measurement accuracy of ± 0.01N and ± 0.51N. The proposed method has the advantages of simple core element sensing, good stability, high precision and easy implementation, providing a new method for detecting the change of internal structure of materials.