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研究了基于编码调制的相位敏感光时域反射计(Φ-OTDR)系统原理,该系统向传感光纤注入经过编码后的光脉冲序列,在接收端经过数据处理提升Φ-OTDR系统信噪比,从而提高系统传感距离.对比研究了脉冲编码方式和传统信号处理方式对系统信噪比的影响;采用格雷码进行了实验分析,通过匹配滤波对编码脉冲回拨信号进行降噪处理,并与单脉冲信号结果进行了对比.结果表明,采用脉冲编码可提高Φ-OTDR系统动态范围,能有效提升系统综合性能.
The phase-sensitive optical time-domain reflectometer (Φ-OTDR) system based on coded modulation is studied. The system injects the encoded optical pulse sequence into the sensing fiber and the signal-to-noise ratio of Φ-OTDR system , So as to improve the sensing distance of the system.The influences of the pulse coding method and the traditional signal processing method on the signal-to-noise ratio of the system are comparatively studied. The gray code is used for the experimental analysis, and the matched pulse filtering is used to reduce the noise of the coded pulse back- The results show that the pulse code can improve the dynamic range of Φ-OTDR system, which can effectively improve the overall performance of the system.