改进的自适应非局部均值去噪方法提高Φ-OTDR信噪比

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2025-05-03 DOI:10.1016/j.optcom.2025.131914

Weiming Zeng, Yizheng Sun, Hengwei Shen, Wen Chen, Jing Liu, Yushan Chen, Zhichun Fan

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引用次数: 0

摘要

提出了一种改进的自适应非局部均值（NLM）去噪方法——侧窗非局部均值（SW-NLM）。与传统NLM滤波采用中心对称的方形窗口不同，SW-NLM方法利用矩形侧窗进一步提高了相敏光时域反射计的信噪比（Φ-OTDR）。此外，SW-NLM方法结合了自适应参数估计，通过计算滤波后迹线的信噪比，并相应地优化平滑系数和窗口大小。SW-NLM算法将信噪比提高了45.85 dB，比NLM滤波提高了25.5%，同时通过侧窗技术更好地保留了有效的振动信息。并将SW-NLM应用于双振动条件下，验证了其多点检测能力。该工作有助于提高Φ-OTDR的性能，提高其信号识别能力。

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SNR improvement for Φ-OTDR with improved adaptive non-local means denoising method

An improved adaptive non-local means (NLM) denoising method, called side window NLM (SW-NLM), was proposed in this study. Unlike the centrally symmetric square windows used in traditional NLM filtering, the SW-NLM method utilized rectangular side windows to further improve the signal-to-noise ratio (SNR) of phase-sensitive optical time domain reflectometer (

Φ

-OTDR). Additionally, SW-NLM method incorporated adaptive parameter estimation by calculating the SNR of the filtered traces and optimizing smoothing coefficients and window sizes accordingly. SW-NLM algorithm increased the SNR by up to 45.85 dB, achieving a 25.5% improvement over the NLM filtering while better preserving effective vibration information through the side window technique. Moreover, SW-NLM was applied to dual vibration condition to validate its capability of multipoint detection. This work contributes to enhancing the performance of

Φ

-OTDR and improving its signal recognition capability.

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来源期刊

Optics Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.