Yu Fei-Hong, Liu Shuaiqi, Shao Liyang, Xu Weijie, Xiao Dongrui, Zhao Fang, Hu Jie, Lin Weihao, Wang Guoqing, Wang Weizhi, Wang Feng, Liu Huanhuan, Shum Perry Ping
Opt Lett. 2022 Jul 15;47(14):3379-3382. doi: 10.1364/OL.456925.
Phase-sensitive optical time-domain reflectometry (Φ-OTDR) based on heterodyne detection is widely used for its simple structure and high signal-to-noise ratio (SNR). However, the large amount of raw data of Φ-OTDR places a heavy burden on the storage device and also limits the transferability of the data. In this Letter, we propose an ultra-low sampling resolution technique to solve the data storage problem in heterodyne Φ-OTDR. Experimental results show that the optical phase variations induced by external vibrations can be successfully demodulated from the 1-bit-resolution raw data, and a vibration SNR of 58.03 dB is achieved. In addition, this work also reveals that a data acquisition device with extremely low sampling resolution is sufficient for heterodyne Φ-OTDR, signifying that the cost of the system can be further decreased.
基于外差检测的相敏光时域反射仪（Φ-OTDR）因其结构简单、信噪比高而被广泛应用。然而，Φ-OTDR的大量原始数据给存储设备带来了沉重负担，也限制了数据的可传输性。在本信函中，我们提出了一种超低采样分辨率技术来解决外差式Φ-OTDR中的数据存储问题。实验结果表明，由外部振动引起的光相位变化能够从1位分辨率的原始数据中成功解调出来，并且实现了58.03 dB的振动信噪比。此外，这项工作还表明，具有极低采样分辨率的数据采集设备对于外差式Φ-OTDR就足够了，这意味着系统成本可以进一步降低。
