Distributed acoustic sensing with high response bandwidth and large dynamic range using multi-frequency time-slot multiplexing pulses based on UWFBG array

IF 2.6 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Optical Fiber Technology Pub Date : 2025-04-28 DOI:10.1016/j.yofte.2025.104247

Ke Tang , Minghong Yang , Yu Wang , Ruofan Wang , Jianguan Tang , Cheng Cheng , Cong Liu

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引用次数: 0

Abstract

The frequency division multiplexing (FDM) scheme is proposed to enhance the repetition rate, which is limited by fiber length in the phase-sensitive optical time-domain reflectometry (Φ-OTDR). However, it is still challenging to increase the dynamic strain range effectively due to inconsistent phase offsets. This work firstly proposes a novel multi-frequency time-slot multiplexing (MFTSM) scheme, which mitigates the phase offset issues across different frequencies and achieves a higher response frequency and larger dynamic range. In a proof-of-principle experiment where the number of multiplexed frequencies and the reuse count per frequency are set to two, the proposed scheme demonstrated that, compared to the traditional IQ scheme, the response bandwidth expands three times and the measurable range of dynamic strain improves 4.66 dB within a 765-meter fiber length, with 5 m spatial resolution.

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基于UWFBG阵列的多频时隙复用脉冲分布式声传感具有高响应带宽和大动态范围

针对相敏光时域反射法（Φ-OTDR）中受光纤长度限制的重复率，提出了频分复用（FDM）方案。然而，由于相位偏移不一致，有效地增加动态应变范围仍然是一个挑战。本文首先提出了一种新的多频时隙复用（MFTSM）方案，该方案缓解了不同频率间的相位偏移问题，实现了更高的响应频率和更大的动态范围。在复用频率数和每频率重复使用次数设置为2的原理验证实验中，与传统的IQ方案相比，该方案的响应带宽扩大了3倍，动态应变的可测范围在765 m的光纤长度内提高了4.66 dB，空间分辨率为5 m。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Fiber Technology 工程技术-电信学

CiteScore

4.80

自引率

11.10%

发文量

327

审稿时长

63 days

期刊介绍： Innovations in optical fiber technology are revolutionizing world communications. Newly developed fiber amplifiers allow for direct transmission of high-speed signals over transcontinental distances without the need for electronic regeneration. Optical fibers find new applications in data processing. The impact of fiber materials, devices, and systems on communications in the coming decades will create an abundance of primary literature and the need for up-to-date reviews. Optical Fiber Technology: Materials, Devices, and Systems is a new cutting-edge journal designed to fill a need in this rapidly evolving field for speedy publication of regular length papers. Both theoretical and experimental papers on fiber materials, devices, and system performance evaluation and measurements are eligible, with emphasis on practical applications.