Zhou Yin, Yan Lianshan, Liu Can, He Haijun, Li Zonglei, Qian Heng, Ye Jia, Pan Wei, Luo Bin
Opt Express. 2021 Oct 11;29(21):33926-33936. doi: 10.1364/OE.440675.
The measurement accuracy of a Brillouin optical time domain analysis (BOTDA) fiber sensor is determined by the signal-to-noise ratio (SNR) of the received sensing signal. Here, a new hybrid aperiodic coding method is proposed to improve the SNR. In the proposed method, two pre-discovered short seed aperiodic codes (SA-codes) are used to construct a new hybrid aperiodic code (HA-code) in a nested way. The HA-code inherits the good denoising capabilities of the two SA-codes and features a high coding gain. In the proof-of-concept experiment, a SNR improvement up to 8 dB is obtained, which improves the measurement certainty to 1.67 MHz over a 117.46 km sensing range under a spatial resolution of 2.6 m.
布里渊光时域分析（BOTDA）光纤传感器的测量精度由接收到的传感信号的信噪比（SNR）决定。在此，提出了一种新的混合非周期编码方法来提高信噪比。在所提出的方法中，使用两个预先发现的短种子非周期码（SA码）以嵌套方式构建一个新的混合非周期码（HA码）。该HA码继承了两个SA码良好的去噪能力，并具有高编码增益。在概念验证实验中，获得了高达8 dB的信噪比提升，在2.6 m的空间分辨率下，在117.46 km的传感范围内将测量精度提高到1.67 MHz。
