Highly Sensitive Partial Discharge Ultrasonic Multipoint Detection Using Single Channel Distributed Feedback Fiber Lasers
Highly Sensitive Partial Discharge Ultrasonic Multipoint Detection Using Single Channel Distributed Feedback Fiber Lasers
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DOI：
10.1109/tim.2023.3311048
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发表时间：
2023
影响因子：
5.6
通讯作者：
W. Qin;Guo-ming Ma;Sihan Wang;Jing Hu;Zhongqin Lin;Rongbin Shi;Hongyang Zhou;Yuan Wang
中科院分区：
文献类型：
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作者：
W. Qin;Guo-ming Ma;Sihan Wang;Jing Hu;Zhongqin Lin;Rongbin Shi;Hongyang Zhou;Yuan Wang
为实现电力变压器局部放电声发射（AE）的高灵敏度多点检测，提出了一种基于分布反馈光纤激光器（DFB-FL）阵列的超声传感系统。将四个DFB-FL连接在一根光纤上作为传感元件，以同步检测PD AE信号。在非平衡马赫-曾德尔干涉仪（MZI）中引入声光调制器（AOM），形成外差相干检测结构，实现超声信号的快速、高灵敏度解调。从理论上讨论了噪声和臂长差对检测下限的影响，并进行了实验验证。通过采用70 m长的延迟光纤，该系统的平均检测限比压电传感器（PZT）低9.54 dB。最后，基于该系统对一个直径为1000 × 1000 × 1100$ mm的油罐中的局部放电源进行了精确定位，定位误差为24.6 mm，该方法在灵敏度、安装方便性、抗干扰性和可靠性等方面具有良好的应用前景。
To realize the highly sensitive multipoint detection of partial discharge (PD) acoustic emission (AE) in power transformers, an ultrasonic sensing system based on a distributed feedback fiber laser (DFB-FL) array was proposed. Four DFB-FLs were connected on a single optical fiber as sensing elements to synchronously detect PD AE signals. The heterodyne coherent detection structure was formed by introducing an acousto-optic modulator (AOM) into the unbalanced Mach-Zehnder interferometer (MZI) to realize the rapid and highly sensitive demodulation of ultrasonic signals. The influence of noises and arm length difference on the lower limit of detection (LLOD) were theoretically discussed and experimentally verified. By adopting a 70-m-long delay fiber, the proposed system performed a 9.54 dB lower average detection limit than that of piezoelectric transducer (PZT). Finally, based on the proposed system, a PD source was accurately located in a $1000 \times 1000 \times 1100$ mm oil tank, and the localization error was 24.6 mm. The proposed method exhibited promising application prospects in sensitivity, installation convenience, anti-interference, and reliability.