Wang Zhaoyong, Pan Zhengqing, Fang Zujie, Ye Qing, Lu Bin, Cai Haiwen, Qu Ronghui
Opt Lett. 2015 Nov 15;40(22):5192-5. doi: 10.1364/OL.40.005192.
A phase-sensitive optical time-domain reflectometry (Φ-OTDR) with a temporally sequenced multi-frequency (TSMF) source is proposed. This technique can improve the system detection bandwidth without the sensing range decreasing. Up to 0.5 MHz detection bandwidth over 9.6 km is experimentally demonstrated as an example. To the best of our knowledge, this is the first time that such a high detection bandwidth over such a long sensing range is reported in Φ-OTDR-based distributed vibration sensing. The technical issues of TSMF Φ-OTDR are discussed in this Letter. This technique will help Φ-OTDR find new important foreground in long-haul distributed broadband-detection applications, such as structural-health monitoring and partial-discharge online monitoring of high voltage power cables.
提出了一种具有时间序列多频（TSMF）源的相敏光时域反射仪（Φ-OTDR）。该技术可以在不减小传感范围的情况下提高系统检测带宽。例如，通过实验证明在9.6公里的距离上可实现高达0.5MHz的检测带宽。据我们所知，这是首次在基于Φ-OTDR的分布式振动传感中报道如此长传感范围内的高检测带宽。本文讨论了TSMF Φ-OTDR的技术问题。该技术将有助于Φ-OTDR在诸如结构健康监测和高压电力电缆局部放电在线监测等长距离分布式宽带检测应用中找到新的重要前景。
