Fiber optic distributed acoustic sensor (DAS) and distributed temperature sensor (DTS) are considerably important for many applications. It is challenging to design a hybrid DAS-DTS system using the same optical fiber because the operation principles of the two sensors are different. We here deploy the widespread standard multimode fiber (MMF) for simultaneous distributed acoustic and temperature sensing. In particular, we operate the MMF in a quasi-single-mode (QSM) state to simultaneously fulfill the functionality requirements of the DAS and DTS. The reported design offers simultaneous vibration and temperature monitoring with high accuracy. In particular, the DAS has a 12.98 dB mean signal-to-noise ratio (SNR) and the DTS offers temperature measurements with ±1 °C accuracy. This technique is significant for many industrial applications because it efficiently tackles a long-standing issue in practical implementation.

中文翻译：

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使用多模光纤同时分布式声学和温度传感

光纤分布式声学传感器 (DAS) 和分布式温度传感器 (DTS) 在许多应用中都非常重要。由于两种传感器的工作原理不同，因此设计使用相同光纤的混合 DAS-DTS 系统具有挑战性。我们在这里部署了广泛使用的标准多模光纤 (MMF)，用于同时进行分布式声学和温度传感。特别是，我们在准单模 (QSM) 状态下运行 MMF，以同时满足 DAS 和 DTS 的功能要求。报告的设计提供高精度的同步振动和温度监测。特别是，DAS 的平均信噪比 (SNR) 为 12.98 dB，DTS 提供精度为 ±1 °C 的温度测量。