解调
超声波传感器
干涉测量
材料科学
光纤
外差探测
局部放电
声学
激光器
干扰(通信)
光纤传感器
光学
电子工程
频道(广播)
计算机科学
工程类
物理
电气工程
电压
电信
作者
Weiqi Qin,Guoming Ma,Sihan Wang,Jing Hu,Zhong-Qin Lin,Rongbin Shi,Hongyang Zhou,Yuan Wang
出处
期刊:IEEE Transactions on Instrumentation and Measurement
[Institute of Electrical and Electronics Engineers]
日期:2023-01-01
卷期号:72: 1-9
被引量:1
标识
DOI:10.1109/tim.2023.3311048
摘要
To realize the highly sensitive multiple-point 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-meter-long delay fiber, the proposed system performed a 9.54 dB lower average detection limit than that of PZT. Finally, based on the proposed system, a partial discharge source was accurately located in a 1000 mm×1000 mm×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.
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