基于伯格算法的双马赫-曾德干涉光纤传感系统

Dual Mach-Zehnder interferometric optical fiber sensing system based on Burg algorithm

针对双马赫-曾德干涉型光纤振动传感系统定位误差较大的问题,提出了一种基于伯格算法的振动定位方法。利用频谱分析法比较伯格算法与快速傅里叶变换算法在不同频数下的能量特征,通过能量比计算确定最优频数,并进行伯格算法最优阶数的选值分析。在最优频数与最优阶数条件下提取特征数据帧,通过互相关计算获取双路振动信号之间的时延,进而获得振动位置。在双马赫-曾德干涉光纤振动传感系统中,开展了振动定位实验研究。实验结果表明,在2.2 km的传感光纤上,本方法能顺利提取出振动信号频率的特征数据帧,且振动定位绝对误差为7.3 m,为提升双马赫-曾德干涉光纤传感系统定位精度提供了新方法。

Aiming at the problem of large positioning error of dual Mach-Zehnder interferometric optical fiber vibration sensor system,a vibration positioning method based on Burg algorithm is proposed.The spectral analysis method is used to compare the energy characteristics of the Burg algorithm and the fast Fourier transform algorithm at different frequencies.The optimal frequency is determined by calculating the energy ratio,and the value selection analysis of the optimal order of the Burg algorithm is carried out.Under the conditions of optimal frequency and order,feature data frames are extracted,and the time delay between two vibration signals is obtained through cross correlation calculation,so as to obtain the vibration position.In the dual Mach-Zehnder interferometric optical fiber vibration sensor system,the experimental research on vibration location is carried out.The experimental results show that the method can successfully extract the characteristic data frame of vibration signal frequency on the 2.2 km sensing optical fiber,and the absolute error of vibration location is 7.3 m,which provides a new method to improve the positioning accuracy of the dual Mach-Zehnder interferometric optical fiber sensing system.