Teng Fei, Yi Duo, Hong Xueming, Li Xuejin
Opt Express. 2021 Apr 26;29(9):13696-13705. doi: 10.1364/OE.421569.
In this study, an optimized localization algorithm is proposed for a dual-Sagnac structure-based fiber optic distributed vibration sensing (DVS) system. Different from the previous localization algorithms, the spectrum peak ratio of the interference signals in the frequency domain is applied for localization calculation, and the localization accuracy is effectively improved for the interference signal with low Signal-Noise-Ratio (SNR). Besides, the proposed optimized algorithm can solve the difficult problem of multi-point vibration localization by employing a continuous low-coherence light source, which largely reduces the system cost. Meanwhile, multi-parameter including the frequency and amplitude of the vibration signal can be retrieved simultaneously except for the vibration position, which is not available for the traditional localization algorithm of the interferometric DVS system. Experimental results verify that the system with the proposed optimized algorithm can realize high-accuracy localization of single-point vibration, multi-point with single-frequency vibration, multi-point with multi-frequency vibration. The corresponding maximum localization errors are only 0.18%, 0.22%, and 0.36% respectively.
在本研究中，针对基于双萨尼亚克结构的光纤分布式振动传感（DVS）系统，提出了一种优化的定位算法。与以往的定位算法不同，该算法应用频域中干扰信号的频谱峰值比进行定位计算，对于低信噪比（SNR）的干扰信号，有效提高了定位精度。此外，所提出的优化算法通过采用连续低相干光源，能够解决多点振动定位的难题，大大降低了系统成本。同时，除了振动位置外，还能同时获取包括振动信号频率和幅度在内的多个参数，而这对于干涉式DVS系统的传统定位算法是无法实现的。实验结果验证，采用所提出优化算法的系统能够实现单点振动、单频多点振动、多频多点振动的高精度定位。相应的最大定位误差分别仅为0.18%、0.22%和0.36%。
