Research on dynamic variance threshold algorithm based on distributed fiber vibration sensor system
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摘要:
为解决分布式光纤振动传感系统的定位准确性弱、灵敏度低及响应速率慢等问题,提出了一种基于相位敏感光时域反射的动态方差阈值算法。该算法将经过带通滤波预处理后的信号进行方差处理、高斯模糊、阈值寻峰以及重心精确,解决了长距离DVS检测由于背向瑞利散射信号的衰减以及运算量大造成的响应时间长的问题。并且采用并行编程技术将运算速度提高了184%,从而快速准确地确定扰动发生位置。实验研究了39 km长度的光纤上人为扰动和噪声的区别,并通过动态方差阈值算法消除了噪声的影响并确定了扰动位置。该系统响应时间为1 s,空间分辨率为20 m,定位误差低于0.1%。
Abstract:In order to solve the problems of weak positioning accuracy, low sensitivity, and slow response speed of the distributed fiber vibration sensor system, a dynamic variance threshold algorithm based on the phase-sensitive photosensitive time domain reflection is proposed. The signal preprocessed by the band-pass filter is processed by variance processing, Gaussian blur, threshold peak seeking, and accurate center of gravity. The problem of long response time caused by the attenuation of Rayleigh scattering signal and the large amount of computation in the long-distance DVS detection is solved. The parallel programming technology is used to improve the operation speed by 184%, so as to quickly and accurately determine the location of the disturbance. The difference between the man-made disturbance and the noise on a 39 km long optical fiber is experimentally studied, and the influence of the noise is eliminated by the dynamic variance algorithm. The response time of the system is 1 second, the spatial resolution is 20 meters, and the positioning error is less than 0.1%.
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Key words:
- ϕ-OTDR /
- variance /
- gaussian blur /
- threshold value
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[1] Juarez J C, Maier E W, Choi K N, et al. Distributed fiber-optic intrusion sensor system[J]. J Lightwave Technol, 2005, 23(6): 2081−2087. doi: 10.1109/JLT.2005.849924
[2] Tan D J, Tian X Z, Sun W, et al. An oil and gas pipeline pre-warning system based on Φ-OTDR[J]. Proc SPIE, 2014, 9157: 91578W. doi: 10.1117/12.2054698
[3] 吴慧娟, 陈忠权, 吕立冬, 等. 基于DOFVS的新型压力输水管道泄漏在线监测方法[J]. 仪器仪表学报, 2017, 38(1): 159−165. doi: 10.3969/j.issn.0254-3087.2017.01.021
Wu H J, Chen Z Q, Lv L D, et al. Novel pressurized water pipe leak monitoring method based on the distributed optical fiber vibration sensor[J]. Chin J Sci Instrument, 2017, 38(1): 159−165. doi: 10.3969/j.issn.0254-3087.2017.01.021
[4] Bao X Y, Zhou D P, Baker C, et al. Recent development in the distributed fiber optic acoustic and ultrasonic detection[J]. J Lightwave Technol, 2017, 35(16): 3256−3267. doi: 10.1109/JLT.2016.2612060
[5] Duckworth G L, Ku E M. OptaSense distributed acoustic and seismic sensing using COTS fiber optic cables for infrastructure protection and counter terrorism[J]. Proc SPIE, 2013, 8711: 87110G. doi: 10.1117/12.2017712
[6] Taylor H F, Lee C E. Apparatus and method for fiber optic intrusion sensing: 5194847[P]. 1993-03-16.
[7] 梁可桢, 潘政清, 周俊, 等. 一种基于相位敏感光时域反射计的多参量振动传感器[J]. 中国激光, 2012, 39(8): 0805004. doi: 10.3788/CJL201239.0805004
Liang K Z, Pan Z Q, Zhou J, et al. Multi-parameter vibration detection system based on phase sensitive optical time domain reflectometer[J]. Chin J Lasers, 2012, 39(8): 0805004. doi: 10.3788/CJL201239.0805004
[8] Martins H F, martin-Lopez S, Corredera P, et al. High visibility phase-sensitive optical time domain reflectometer for distributed sensing of ultrasonic waves[J]. Proc SPIE, 2013, 8794: 87943F. doi: 10.1117/12.2026081
[9] 孙振世. 基于分布式光纤振动传感的压力水管泄漏监测应用研究[D]. 成都: 电子科技大学, 2016.
Sun Z S. Study on leakage monitor of pressure water pipe based on distributed optical fiber vibration sensing technology[D]. Chengdu: University of Electronic Science and Technology of China, 2016.
[10] 李信宇, 车前, 熊玉川, 等. 基于弱光栅阵列增强的Φ-OTDR传感系统性能分析[J]. 光电子·激光, 2019, 30(7): 673−677. doi: 10.16136/j.joel.2019.07.0002
Li X Y, Che Q, Xiong Y C, et al. The analysis of improved phase-OTDR sensing system employing weak fiber Bragg grating array[J]. J Optoelectron·Laser, 2019, 30(7): 673−677. doi: 10.16136/j.joel.2019.07.0002
[11] 吴慧娟, 刘欣雨, 饶云江. 基于Φ-OTDR的光纤分布式传感信号处理及应用[J]. 激光与光电子学进展, 2021, 58(13): 1306003−51. doi: 10.3788/LOP202158.1306003
Wu H J, Liu X Y, Rao Y J. Processing and application of fiber optic distributed sensing signal based on Φ-OTDR[J]. Laser Optoelectron Prog, 2021, 58(13): 1306003−51. doi: 10.3788/LOP202158.1306003
[12] 褚庆昕, 陈付昌. 多频带通滤波器技术(英文)[J]. 华南理工大学学报(自然科学版), 2012, 40(10): 219−226. doi: 10.3969/j.issn.1000-565X.2012.10.031
Chu Q X, Chen F C. Multiband bandpass filter technologies[J]. J South China Univ Technol (Nat Sci Ed), 2012, 40(10): 219−226. doi: 10.3969/j.issn.1000-565X.2012.10.031
[13] 张燕君, 刘文哲, 付兴虎, 等. 基于EMD-AWPP和HOSA-SVM算法的分布式光纤振动入侵信号的特征提取与识别[J]. 光谱学与光谱分析, 2016, 36(2): 577−582. doi: 10.3964/j.issn.1000-0593(2016)02-0577-06
Zhang Y J, Liu W Z, Fu X H, et al. An extraction and recognition method of the distributed optical fiber vibration signal based on EMD-AWPP and HOSA-SVM algorithm[J]. Spectrosc Spectral Anal, 2016, 36(2): 577−582. doi: 10.3964/j.issn.1000-0593(2016)02-0577-06
[14] 袁晓月, 谭中伟. 基于φ-OTDR的分布式光纤传感技术的现状与发展[J]. 光通信技术, 2018, 42(2): 23−26. doi: 10.13921/j.cnki.issn1002-5561.2018.02.007
Yuan X Y, Tan Z W. Status and development of distributed optical fiber sensing technology based on φ-OTDR[J]. Opt Commun Technol, 2018, 42(2): 23−26. doi: 10.13921/j.cnki.issn1002-5561.2018.02.007
[15] 金燊, 宋伟, 杨纯, 等. 120 km长距离分布式光纤振动传感系统[J]. 光通信研究, 2021(3): 20−24. doi: 10.13756/j.gtxyj.2021.03.005
Jin S, Song W, Yang C, et al. 120 km long-distance distributed optical fiber vibration sensing system[J]. Study Opt Commun, 2021(3): 20−24. doi: 10.13756/j.gtxyj.2021.03.005
[16] 卢斌, 王照勇, 郑汉荣, 等. 高空间分辨率长距离分布式光纤振动传感系统[J]. 中国激光, 2017, 44(10): 1015001. doi: 10.3788/CJL201744.1015001
Lu B, Wang Z Y, Zheng H R, et al. High spatial resolution long distance distributed optical fiber vibration sensing system[J]. Chin J Lasers, 2017, 44(10): 1015001. doi: 10.3788/CJL201744.1015001
[17] Chow D M, Yang Z S, Soto M A, et al. Distributed forward Brillouin sensor based on local light phase recovery[J]. Nat Commun, 2018, 9(1): 2990. doi: 10.1038/s41467-018-05410-2
[18] 潘亮, 刘琨, 江俊峰, 等. 分布式光纤振动和温度双物理量传感系统[J]. 中国激光, 2018, 45(1): 0110002. doi: 10.3788/CJL201845.0110002
Pan L, Liu K, Jiang J F, et al. Distributed fiber-optic vibration and temperature sensing system[J]. Chin J Lasers, 2018, 45(1): 0110002. doi: 10.3788/CJL201845.0110002
[19] Liu S Q, Yu F H, Hong R, et al. Advances in phase-sensitive optical time-domain reflectometry[J]. Opto-Electron Adv, 2022, 5(3): 200078. doi: 10.29026/oea.2022.200078
[20] Zan W, Wang Y, Liu X, et al. Envelope extraction for vibration locating in coherent φ-OTDR[J]. Sensors, 2022, 22(3): 1197. doi: 10.3390/s22031197
[21] Li S, Qin Z G, Liu Z J, et al. Long-distance φ-OTDR with a flexible frequency response based on time division multiplexing[J]. Opt Express, 2021, 29(21): 32833−32841. doi: 10.1364/OE.435883
[22] Zhang M, Wang S, Zheng Y W, et al. Enhancement for φ-OTDR performance by using narrow linewidth light source and signal processing[J]. Photonic Sens, 2016, 6(1): 58−62. doi: 10.1007/s13320-015-0283-7
[23] Peng F, Wu H, Jia X H, et al. Ultra-long high-sensitivity φ-OTDR for high spatial resolution intrusion detection of pipelines[J]. Opt Express, 2014, 22(11): 13804−13810. doi: 10.1016/j.optlaseng.2015.08.010.
[24] 肖文哲, 程静, 张大伟, 等. 用于光纤干涉传感器的高稳定PGC解调技术[J]. 光电工程, 2022, 49(3): 210368. doi: 10.12086/oee.2022.210368
Xiao W Z, Cheng J, Zhang D W, et al. High stability PGC demodulation technique for fiber-optic interferometric sensor[J]. Opto-Electron Eng, 2022, 49(3): 210368. doi: 10.12086/oee.2022.210368
[25] 张永康, 尚盈, 王晨, 等. 分布式光纤入侵信号检测与识别[J]. 光电工程, 2021, 48(3): 200254. doi: 10.12086/oee.2021.200254
Zhang Y K, Shang Y, Wang C, et al. Detection and recognition of distributed optical fiber intrusion signal[J]. Opto-Electron Eng, 2021, 48(3): 200254. doi: 10.12086/oee.2021.200254
[26] Liu T, Li H, He T, et al. Ultra-high resolution strain sensor network assisted with an LS-SVM based hysteresis model[J]. Opto-Electron Adv, 2021, 4(5): 200037. doi: 10.29026/oea.2021.200037