POTDR振动传感系统的数据处理与分析方法
发布时间：2019-06-15 14:21
【摘要】：偏振敏感光时域反射仪(POTDR)可用于检测光纤中背向传输瑞利散射信号里由振动引起的偏振态变化信息。立足于将基于偏振敏感光时域反射仪的全分布式振动传感器开发成一个便捷的测量仪器,研究了偏振敏感分布式振动光纤振动传感实验系统的数据处理与分析方法,重点研究了数字平均降噪和小波降噪以提高系统的响应实时性和信噪比。研究上述方法下系统的信噪比、响应时间、振幅分辨率、频率分辨率等参数所能达到的精度。研究结果表明使用时域波形平均的方法和小波降噪的方法均可大幅提高系统信噪比。系统实现了14 km的分布式振动传感,在1.26 s的时间响应下达到1 Hz的频率分辨率,系统信噪比达10 d B。
[Abstract]:The polarization sensitive time domain reflectometer (POTDR) can be used to detect the polarization state change caused by vibration in the backpropagation Rayleigh scattering signal in optical fiber. Based on the development of a fully distributed vibration sensor based on polarization sensitive time domain reflectometer into a convenient measuring instrument, the data processing and analysis method of polarization sensitive distributed vibration fiber vibration sensing experimental system is studied, with emphasis on digital average noise reduction and wavelet noise reduction to improve the real-time response and signal-to-noise ratio of the system. The accuracy of signal-to-noise ratio (SNR), response time, amplitude resolution, frequency resolution and other parameters of the system under the above method is studied. The results show that the signal-to-noise ratio (SNR) of the system can be greatly improved by using the time domain waveform average method and the wavelet denoising method. The distributed vibration sensor with 14 km is realized. The frequency resolution of 1 Hz is achieved under the time response of 1.26 s, and the signal-to-noise ratio (SNR) of the system is 10 d.
【作者单位】： 南京晓庄学院电子工程学院;南京大学光通信工程研究中心;
【基金】：江苏省高校自然科学研究项目(16KJB510019,16KJB140008) 南京晓庄学院青年专项基金(2013NXY100,2015NXY034)资助项目
【分类号】：TP212
本文编号：2500285
[Abstract]:The polarization sensitive time domain reflectometer (POTDR) can be used to detect the polarization state change caused by vibration in the backpropagation Rayleigh scattering signal in optical fiber. Based on the development of a fully distributed vibration sensor based on polarization sensitive time domain reflectometer into a convenient measuring instrument, the data processing and analysis method of polarization sensitive distributed vibration fiber vibration sensing experimental system is studied, with emphasis on digital average noise reduction and wavelet noise reduction to improve the real-time response and signal-to-noise ratio of the system. The accuracy of signal-to-noise ratio (SNR), response time, amplitude resolution, frequency resolution and other parameters of the system under the above method is studied. The results show that the signal-to-noise ratio (SNR) of the system can be greatly improved by using the time domain waveform average method and the wavelet denoising method. The distributed vibration sensor with 14 km is realized. The frequency resolution of 1 Hz is achieved under the time response of 1.26 s, and the signal-to-noise ratio (SNR) of the system is 10 d.
【作者单位】： 南京晓庄学院电子工程学院;南京大学光通信工程研究中心;
【基金】：江苏省高校自然科学研究项目(16KJB510019,16KJB140008) 南京晓庄学院青年专项基金(2013NXY100,2015NXY034)资助项目
【分类号】：TP212
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