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Study of a novel distributed vibration sensing system based on weak fiber Bragg gratings (Retracted article)

机译：基于弱纤维布拉格光栅的新型分布式振动传感系统研究（缩回文章）

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摘要

A novel vibration sensing system based on distributed weak fiber Bragg gratings is demonstrated to overcome the drawbacks of the conventional methods used in optical fiber sensing networking, such as insufficient quantity of multiplexed fiber Bragg gratings in wavelength-division multiplexing systems and low signal intensity in conventional time-division multiplexing systems. By mixing wavelength-division multiplexing technology and time-division multiplexing technology, the physical parameters of the fiber Bragg grating locations can be measured, but the distributed measurement along the whole optical fiber cannot be realized. The proposed novel sensing system detects the vibration events along the optical fiber link according to the signal's intensity interference variation caused by the reflected signals with the adjacent weak fiber Bragg gratings. The position of the vibration events can be accurately determined by using time-division multiplexing technology. The experimental results verify that this novel system is more convenient for realizing vibration detection and demodulation along the whole optical fiber than before, and the system locating accuracy can be up to 20.5 m, with the capability of detecting various signals with 0.2 V of the driven signals as the bottom limit of voltage and a frequency range from 3 to 1000 Hz. (C) 2018 Optical Society of America
机译：证明了一种基于分布式弱光纤布拉格光栅的新型振动传感系统，以克服光纤感测网络中使用的传统方法的缺点，例如波分复用系统中的多路复用光纤布拉格光栅的不足和传统的低信号强度时分复用系统。通过混合波分复用技术和时分复用技术，可以测量光纤布拉格光栅位置的物理参数，但是沿整个光纤的分布测量不能实现。所提出的新型感测系统根据由具有相邻弱光纤布拉格光栅的反射信号引起的信号的强度干扰变化来检测沿光纤链路的振动事件。可以通过使用时分复用技术来准确地确定振动事件的位置。实验结果验证了这种新颖的系统更方便地实现沿整个光纤的振动检测和解调，并且系统定位精度最高可达20.5米，具有检测具有0.2V驱动的各种信号的能力信号作为电压的底部极限和频率范围为3至1000Hz。 （c）2018年光学学会

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