POTDR振動傳感系統(tǒng)的數(shù)據(jù)處理與分析方法
發(fā)布時間:2019-06-15 14:21
【摘要】:偏振敏感光時域反射儀(POTDR)可用于檢測光纖中背向傳輸瑞利散射信號里由振動引起的偏振態(tài)變化信息。立足于將基于偏振敏感光時域反射儀的全分布式振動傳感器開發(fā)成一個便捷的測量儀器,研究了偏振敏感分布式振動光纖振動傳感實驗系統(tǒng)的數(shù)據(jù)處理與分析方法,重點研究了數(shù)字平均降噪和小波降噪以提高系統(tǒng)的響應實時性和信噪比。研究上述方法下系統(tǒng)的信噪比、響應時間、振幅分辨率、頻率分辨率等參數(shù)所能達到的精度。研究結(jié)果表明使用時域波形平均的方法和小波降噪的方法均可大幅提高系統(tǒng)信噪比。系統(tǒng)實現(xiàn)了14 km的分布式振動傳感,在1.26 s的時間響應下達到1 Hz的頻率分辨率,系統(tǒng)信噪比達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.
【作者單位】: 南京曉莊學院電子工程學院;南京大學光通信工程研究中心;
【基金】:江蘇省高校自然科學研究項目(16KJB510019,16KJB140008) 南京曉莊學院青年專項基金(2013NXY100,2015NXY034)資助項目
【分類號】:TP212
本文編號: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.
【作者單位】: 南京曉莊學院電子工程學院;南京大學光通信工程研究中心;
【基金】:江蘇省高校自然科學研究項目(16KJB510019,16KJB140008) 南京曉莊學院青年專項基金(2013NXY100,2015NXY034)資助項目
【分類號】:TP212
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