在格雷编码布里渊光时域分析(BOTDA)传感器中,采用随机扰偏技术,不仅会在消除强偏振牵引效应时引起传感信号信噪比恶化,同时也会引入较强的偏振随机噪声(PRN)而降低传感信号的测量准确度。通过仿真分析和实验研究,证实了偏振随机噪声对传感信号的影响,并基于布里渊相移谱抑制了偏振随机噪声,实验结果表明该方法可使传感准确度提高3倍。

Random polarization control in Golay-coded Brillouin optical time domain analysis (BOTDA) fiber sensors can be used to mitigate the deterioration in the signal-to-noise ratio caused by the strong pulling effect of polarization. However, a relatively strong polarization random noise (PRN) is induced, which may reduce the measurement accuracy of the sensing signal. In this study, the effect of PRN on the sensing signal was confirmed through simulation analysis and experimental verification. Furthermore, Brillouin phase shift was used to suppress PRN. Experimental results show that the sensing accuracy is enhanced threefold using the proposed method.