基于小波包的相位敏感OTDR分布式光纤振动信号降噪方法的研究

发布时间：2018-06-29 12:32

本文选题：小波包 + 相位敏感光时域反射计　；参考：《光电子·激光》2017年01期

【摘要】：针对传统的基于相位敏感光时域反射计(鐖-OTDR)的分布式振动传感系统在对外界振动信号降噪效果方面的不足,提出了一种基于小波包的降噪优化方法:首先分析采集到振动点处信号的特征并选取最优基波Sym6,比对不同的基波分解层数对于原始信号降噪处理后的效果,从中选择三层分解作为最优化分解层数。其次对信号处理前后的信号进行傅里叶变换,通过频域比对证明小波包降噪方法能够有效去除主振信号以外的噪声。再次针对振动点附近的采集点进行了频谱分析,结果显示只有振动点对应采集点的频率与振动频率相同,从而证明了系统实际空间分辨率可达到1 m。
[Abstract]:The traditional distributed vibration sensing system based on phase sensitive optical time domain reflectometer (OTDR) is not effective in noise reduction of external vibration signals. A noise reduction optimization method based on wavelet packet is proposed. Firstly, the characteristics of the signal collected at the vibration point are analyzed and the optimal fundamental wave Sym6 is selected to compare the effect of different fundamental decomposition layers on the original signal noise reduction. The three-layer decomposition is selected as the optimal number of decomposition layers. Secondly, the signal before and after signal processing is processed by Fourier transform, and it is proved by frequency domain comparison that the wavelet packet denoising method can effectively remove the noise other than the main vibration signal. The frequency spectrum analysis of the sampling point near the vibration point is carried out again. The results show that only the frequency of the acquisition point corresponding to the vibration point is the same as the vibration frequency, which proves that the actual spatial resolution of the system can reach 1 m.
【作者单位】：武汉理工大学光纤传感技术国家工程实验室光纤传感技术与信息处理教育部重点实验室;汉口学院电子信息工程学院;长江大学计算机科学学院;
【基金】：湖北省教育厅科学研究计划指导性项目(B2016322);湖北省教育厅科学技术研究项目(B2015445) 2015年长江大学社科基金(2015csy002) 长江大学楚文化研究院开放基金(CWH201602) 中央高校基本科研业务费专项资金(2015III056)资助项目
【分类号】：TN253;TP212

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