Optical ultrasonic sensor multiplexing for partial discharge (PD) detection based on a single photodetector is a challenging task. In this paper, we propose a novel multiplexed optical ultrasonic sensing system based on swept frequency interferometry. Optical ultrasonic sensor multiplexing is achieved using different carrier frequencies that depend on the length differences between the sensing fibers and the reference fiber. Only one photodetector is required for multiple-point optical fiber ultrasonic sensing. The experimental results indicate that the ultrasonic signals generated by a partial discharge defect model can be simultaneously detected. Then, the PD defect was accurately localized based on the arrival times of an ultrasonic signal at the multiplexed sensors.

中文翻译：

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使用单个光电探测器的电力变压器多路复用光学局部放电传感系统

基于单个光电探测器进行局部放电（PD）检测的光学超声传感器多路复用是一项艰巨的任务。在本文中，我们提出了一种基于扫频干涉法的新型多路复用光学超声传感系统。使用不同的载波频率可以实现光学超声传感器的多路复用，这些载波频率取决于传感光纤和参考光纤之间的长度差异。多点光纤超声感测仅需要一个光电探测器。实验结果表明，可以同时检测局部放电缺陷模型产生的超声信号。然后，基于超声信号在多路复用传感器处的到达时间，可以准确地定位PD缺陷。