Opt Lett. 2023 Feb 15;48(4):1048-1051. doi: 10.1364/OL.482219.
An effective orthogonal signal generation method for heterodyne-detection-based phase-sensitive optical time-domain reflectometer systems is proposed to accelerate the phase demodulation process. The demodulation principle is based on the spatial phase shifting technique. By exploiting the relative phase difference between adjacent spatial sampling channels, the orthogonal signal is easily obtained from basic algebra calculations. The simulation and experimental results showed that the proposed method achieved >100% computation speed improvement compared with the conventional methods, with a slight trade-off in phase demodulation performance. Therefore, the proposed method is potentially beneficial for the distributed acoustic sensing technology for reducing the computation complexity of phase demodulation procedures.
提出了一种用于外差探测型相位敏感光时域反射计系统的有效正交信号生成方法，以加速相位解调过程。该解调原理基于空间相移技术。通过利用相邻空间采样通道之间的相对相位差，可以通过基本的代数计算轻松获得正交信号。仿真和实验结果表明，与传统方法相比，该方法的计算速度提高了>100%，而相位解调性能略有下降。因此，该方法对于分布式声学传感技术具有潜在的益处，可以降低相位解调过程的计算复杂度。
