Huang Jingwei, Chen Yongchao, Song Qiuheng, Peng Hekuo, Zhou Pengwei, Xiao Qian, Jia Bo
Opt Express. 2020 Aug 17;28(17):24820-24832. doi: 10.1364/OE.399640.
A novel distributed fiber-optic sensor is proposed and demonstrated, in which two Mach-Zehnder interferometers are used to detect the interference signals with different wavelengths, and one 3 × 3 coupler is deployed to demodulate the time-varying phase change caused by vibration. The novel dual Mach-Zehnder interferometer (DMZI) is composed of two wavelength division multiplexers. Then, a time delay estimation algorithm is designed to construct two related signals using the phase difference, and the two constructed signals are used to obtain vibration position through cross-correlation. Experimental results show that the sensing distance can reach 100 km and the location error is within ±25 m.
提出并演示了一种新型分布式光纤传感器，其中使用两个马赫-曾德尔干涉仪来检测不同波长的干涉信号，并部署一个3×3耦合器来解调由振动引起的时变相位变化。新型双马赫-曾德尔干涉仪（DMZI）由两个波分复用器组成。然后，设计了一种时延估计算法，利用相位差构建两个相关信号，并通过互相关利用这两个构建信号来获取振动位置。实验结果表明，传感距离可达100 km，定位误差在±25 m以内。
