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在基于布里渊散射的光时域反射计(BOTDR)中,信噪比和空间分辨率相互制约,而脉冲编码技术是将探测脉冲编码后注入传感光纤,从而在保证空间分辨率的同时提高入射信号的功率,提高系统信噪比。分析了Golay、Simplex和CCPONS码应用于BOTDR系统的编解码过程及编码增益,研究了基于脉冲编码的本地外差BOTDR分布式传感系统原理和组成,并利用MATLAB对采用三种编码技术的系统性能进行了仿真。仿真结果表明,采用脉冲编码技术后,系统的温度和应变分辨率得到有效地提高,并且编码长度越长,系统性能提升效果越明显,CCPONS码比另外两种码型更具有优越性。
In BOTDR based on Brillouin scattering, the signal-to-noise ratio and the spatial resolution are mutually restricted, and the pulse coding technology is to inject the detection pulse into the sensing fiber, so as to ensure the spatial resolution Improve the incident signal power, improve the system signal to noise ratio. The coding and coding gain of Golay, Simplex and CCPONS codes applied to BOTDR system are analyzed. The principle and composition of local heterodyne BOTDR distributed sensing system based on pulse coding are studied. The system using three coding techniques Performance was simulated. The simulation results show that the temperature and strain resolution of the system are effectively improved after using the pulse coding technology. The longer the coding length, the more obvious the system performance improvement effect is. The CCPONS code has more advantages than the other two patterns.