Volume 45 Issue 3
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Wang Peng, Lou Shuqin, Liang Sheng, Zhang Yan. Selective average based threshold algorithm for φ-OTDR distributed fiber-optic sensing system[J]. Infrared and Laser Engineering, 2016, 45(3): 322003-0322003(6). doi: 10.3788/IRLA201645.0322003
Citation: Wang Peng, Lou Shuqin, Liang Sheng, Zhang Yan. Selective average based threshold algorithm for φ-OTDR distributed fiber-optic sensing system[J]. Infrared and Laser Engineering, 2016, 45(3): 322003-0322003(6). doi: 10.3788/IRLA201645.0322003
shu

Selective average based threshold algorithm for φ-OTDR distributed fiber-optic sensing system

doi: 10.3788/IRLA201645.0322003
  • 1.

    School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing 100044,China;

  • 2.

    School of Science,Beijing Jiaotong University,Beijing 100044,China

  • Received Date: 2015-07-05
  • Rev Recd Date: 2015-08-15
  • Publish Date: 2016-03-25
  • Accurate threshold is the key factor for reducing both of missing and nuisance alarm rates, which is essential for the -OTDR distributed fiber-optic sensing system. In order to solve this problem effectively, the algorithm based on the selective average was proposed. During this proposed algorithm, a pre-selection scheme was achieved using the correlation difference method to determine a signal template. Then, the match of threshold template can be realized. Theoretical and experimental results show that by the proposed algorithm the threshold can be obtained to decrease the missing and nuisance alarm rates, and improve the signal-to-noise ratio(SNR) of the -OTDR distributed fiber optic sensing system. In comparison with current direct and moving average algorithm, the missing alarm rate is decreased by 2%, and the nuisance alarm rate is decreased by 5% and 3%. What's more, the SNR is increased by 2.55 dB and 1.1 dB, respectively. In conclusion, the proposed algorithm was also useful to improve the real-time reliability of the system for the practical applications.
  • [1] Liu Ming, Zhang Shulin, Li Hua, et al. Study of a selective averaging method formagnetocardiography-based noise suppression[J]. Acta Phys Sin, 2013, 62(9):098501. (in Chinse)刘明, 张树林, 李华, 等. 一种应用于心磁噪声抑制的选择性平均算法研究[J]. 物理学报, 2013, 62(9):098501.
    [2] Lu Y, Zhu T, Chen L, et al. Distributed vibration sensor based on coherent detection of phase-OTDR[J]. Journal of Lightwave Technology, 2010, 28(22):3243-3249.
    [3] Wang Jie, Jia Xinhong, Rao Yunjiang, et al. Phase-sensitive optical time-domain reflectometer based on bi-directional Raman amplification[J]. Acta Phys Sin, 2013, 62(4):044212. (in Chinse)王杰, 贾新鸿, 饶云江, 等. 基于双向拉曼放大的相位敏感光时域反射仪[J]. 物理学报, 2013, 62(4):044212.
    [4] Wang Siyuan, Lou Shuqin, Liang Sheng, et al. Pattern recognition method of fiber distributed disturbance sensing system based on M-Z interferometer[J]. Infrared and Laser Engineering, 2014, 43(8):2613-2618. (in Chinse)王思远, 娄淑琴, 梁生, 等. MZ干涉仪型光纤分布式扰动传感系统模式识别方[J]. 红外与激光工程, 2014, 43(8):2613-2618.
    [5] Zhang Chunxi, Zhong Xiang, Li Lijing, et al. Long-distance intrusion sensor based on phase sensitivity optical time domain reflectometry[J]. Infrared and Laser Engineering, 2015, 44(2):742-746. (in Chinse)张春熹, 钟翔, 李立京, 等. 基于相位敏感光时域反射计的长距离入侵探测系统[J]. 红外与激光工程, 2015, 44(2):742-746.
    [6] Lv Qiying, Li Lijing, Wang Hongbo, et al. Influences of laser on fiber-optic distributed disturbance sensor based on -OTDR[J]. Infrared and L aser Engineering, 2014, 43(12):3918-3923. (in Chinse)吕其英, 李立京, 王洪波, 等. -OTDR的分布式光纤扰动传感系统光源参数影响[J]. 红外与激光工程, 2014, 43(12):3918-3923.
    [7] Wang Z N, Li J, Fan M Q, et al. Phase-sensitive optical time-domain reflectometry with Brillouin amplification[J]. Optics Letters, 2014, 39(15):4313-4316.
    [8] Peng F, Wu H, Jia X H, et al. Ultra-long high-sensitivity -OTDR for high spatial resolution intrusion detection of pipelines[J]. Optics Express, 2014, 22(11):13804-13810.
    [9] Zhong X, Zhang C, Li L, et al. Influences of laser source on phase-sensitivity optical time-domain reflectometer-based distributed intrusion sensor[J]. Applied Optics, 2014, 53(21):4645-4650.
    [10] Xie K L, Rao Y J, Ran Z L. Distributed optical fiber sensing system based of Rayleigh scattering light -OTDR using single-mode fiber laser with high power and narrow linewidth[J]. Acta Optica Sinica, 2008, 28(3):569-572.
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Selective average based threshold algorithm for φ-OTDR distributed fiber-optic sensing system

doi: 10.3788/IRLA201645.0322003
  • 1. School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing 100044,China;
  • 2. School of Science,Beijing Jiaotong University,Beijing 100044,China
  • Received Date: 2015-07-05
  • Rev Recd Date: 2015-08-15
  • Publish Date: 2016-03-25

Abstract: Accurate threshold is the key factor for reducing both of missing and nuisance alarm rates, which is essential for the -OTDR distributed fiber-optic sensing system. In order to solve this problem effectively, the algorithm based on the selective average was proposed. During this proposed algorithm, a pre-selection scheme was achieved using the correlation difference method to determine a signal template. Then, the match of threshold template can be realized. Theoretical and experimental results show that by the proposed algorithm the threshold can be obtained to decrease the missing and nuisance alarm rates, and improve the signal-to-noise ratio(SNR) of the -OTDR distributed fiber optic sensing system. In comparison with current direct and moving average algorithm, the missing alarm rate is decreased by 2%, and the nuisance alarm rate is decreased by 5% and 3%. What's more, the SNR is increased by 2.55 dB and 1.1 dB, respectively. In conclusion, the proposed algorithm was also useful to improve the real-time reliability of the system for the practical applications.

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