Denoising Algorithm for <i>φ</i>-OTDR System Based on Adaptive Wavelet Threshold

Donghui Wan; Shengpeng Wan; Junsong Yu

doi:10.3788/LOP232722

Laser & Optoelectronics Progress, Volume. 61, Issue 21, 2106004(2024)

Denoising Algorithm for φ-OTDR System Based on Adaptive Wavelet Threshold

Donghui Wan¹, Shengpeng Wan^1、*, and Junsong Yu^2、**

¹Key Laboratory of Optoelectronic Information Science and Technology of Jiangxi Province, School of Measuring and Optical Engineering, Nanchang Hangkong University, Nanchang 330063, Jiangxi , China

²Key Laboratory of Nondestructive Test, Ministry of Education, School of Measuring and Optical Engineering, Nanchang Hangkong University, Nanchang 330063, Jiangxi , China

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Figures & Tables(9)

Fig. 1. Structure of φ-OTDRsystem based on heterodyne detection

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Fig. 2. I/Q orthogonal demodulation flowchart

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Fig. 3. Image with different threshold functions

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Fig. 4. Simulated ground intrusion environment

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Fig. 5. Stampede signal waveform after denoising by different methods

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Fig. 6. Mining signal waveform after denoising by different methods

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Fig. 7. Object drop signal waveform after denoising by different methods

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Fig. 8. Rolling signal waveform after denoising by different methods

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Table 1. SNR of 4 types of events after denoising by different methods
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Table 1. SNR of 4 types of events after denoising by different methods
Method SNR /dB
Stampede Mining Object drop Rolling
None 11.72 9.19 9.12 12.78
Hard threshold function 14.75 14.04 16.07 17.10
Soft threshold function 16.32 18.60 21.88 20.06
Proposed 24.83 32.92 32.99 27.24

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Donghui Wan, Shengpeng Wan, Junsong Yu. Denoising Algorithm for φ-OTDR System Based on Adaptive Wavelet Threshold[J]. Laser & Optoelectronics Progress, 2024, 61(21): 2106004

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