基于三次样条函数的光栅传感光缆舞动波长估计

Wave wavelength estimation of fiber-optic grating sensor based on cubic spline function

摘要:

基于光栅传感的分布式光纤复合架空地线(OPGW)健康监测得到了广泛研究。本文针对OPGW光缆舞动事件,提出一种基于构建三次样条函数拟合的舞动波长预测方法。首先,通过理论分析推导并建立了光栅传感相移信号与舞动波长的数学联系；然后,利用仿真分析了理想舞动情况下信号三次样条函数拟合前后的相移信号结果,初步证明了本文提出方法的有效性；最后,将其应用在于伊犁哈萨克自治州的某220 kV线路,对比分析典型弱风环境及强风环境下的舞动监测强度图,实际监测结果表面,本文所选取方法能够增强强度图信号特征,有效估计强风条件下舞动波长约200 m,弱风条件下舞动波长约50 m。该方法为舞动事件的图像识别智能监测提供技术参考,具有较强应用前景。

Abstract:

Distributed Optical Fiber Composite Overhead Ground Wire (OPGW) health monitoring based on fiber Bragg grating (FBG) sensor has been widely studied. Aiming at the OPGW cable dancing event, we propose a wave wavelength prediction method based on constructing cubic spline function fitting. Firstly, the mathematical relation between FBG sensor phase shift signal and wave is established through theoretical analysis. And then the results of phase shift signal before and after cubic spline function fitting under ideal dancing condition are analyzed by simulation, it proves the effectiveness of the proposed method. Finally, it is applied to a 220 kV line in Ili Kazak Autonomous Prefecture, we compare and analyze the intensity chart of dancing monitoring in typical weak wind environment and strong wind environment. According to the actual monitoring results, the proposed method in this paper is effective on enhancing the signal characteristics of intensity graph, and effectively estimate the waving wavelength of about 200 m in strong wind condition and 50 m in weak wind condition. This method provides technical reference for intelligent monitoring of image recognition of dancing events and has strong application prospect.