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提出了一种基于线型腔拉曼光纤激光器的长距离分布式光纤布拉格光栅(FBG)传感解调系统,并进行了理论分析和实验验证。传感光纤布拉格光栅构成拉曼光纤激光器腔镜的一端,受一维调节器调节控制的匹配光纤布拉格光栅构成腔镜的另一端。一维调节器与步进电机相连,步进电机由计算机(PC)通过可编程逻辑控制器(PLC)进行控制,一维调节器通过调节匹配光纤布拉格光栅的周期来控制激光器的输出。实验结果表明,传感解调系统能很好地实现长距离分布式传感及传感信号的检测。30 km非归零色散位移光纤(NZDSF)用于拉曼增益可以产生信噪比大于40 dB的稳定拉曼激光输出,在4.2 nm范围内系统解调精度为0.05 nm。
A long distance distributed fiber Bragg grating (FBG) sensing demodulation system based on linear cavity Raman fiber laser is proposed, and theoretical analysis and experimental verification are carried out. The sensing fiber Bragg grating forms one end of the Raman fiber laser cavity mirror, and the matched fiber Bragg grating controlled by the one-dimensional regulator forms the other end of the cavity mirror. The one-dimensional regulator is connected to a stepper motor controlled by a computer (PC) via a programmable logic controller (PLC). The one-dimensional regulator controls the output of the laser by adjusting the period of matching fiber Bragg gratings. The experimental results show that the sensing demodulation system can realize long-distance distributed sensing and sensing signal detection well. 30 km Non-Zero Return Dispersion-Shifted Fiber (NZDSF) For Raman gain, a stable Raman laser output with a signal-to-noise ratio greater than 40 dB can be generated with a system demodulation accuracy of 0.05 nm over 4.2 nm.