Muanenda Yonas, Oton Claudio J, Faralli Stefano, Nannipieri Tiziano, Signorini Alessandro, Di Pasquale Fabrizio
Opt Lett. 2016 Feb 1;41(3):587-90. doi: 10.1364/OL.41.000587.
We demonstrate a hybrid distributed acoustic and temperature sensor (DATS) using a commercial off-the-shelf (COTS) distributed feedback (DFB) laser, a single-mode optical fiber, and a common receiver block. We show that the spectral and frequency noise characteristics of the laser, combined with a suitable modulation scheme, ensure the inter-pulse incoherence and intra-pulse coherence conditions required for exploiting the fast denoising benefits of cyclic Simplex pulse coding in the hybrid measurement. The proposed technique enables simultaneous, distributed measurement of vibrations and temperature, with key industrial applications in structural health monitoring and industrial process control systems. The sensor is able to clearly identify a 500 Hz vibration at 5 km distance along a standard single-mode fiber and simultaneously measure the temperature profile along the same fiber with a temperature resolution of less than 0.5°C with 5 m spatial resolution.
我们展示了一种混合分布式声学和温度传感器（DATS），它使用商用现货（COTS）分布式反馈（DFB）激光器、单模光纤和一个通用接收器模块。我们表明，激光器的光谱和频率噪声特性，结合合适的调制方案，确保了在混合测量中利用循环单纯形脉冲编码的快速去噪优势所需的脉冲间非相干和脉冲内相干条件。所提出的技术能够同时进行振动和温度的分布式测量，在结构健康监测和工业过程控制系统中有重要的工业应用。该传感器能够沿着标准单模光纤在5公里距离处清晰识别500赫兹的振动，并同时以小于0.5°C的温度分辨率和5米的空间分辨率测量沿同一光纤的温度分布。
