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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Signal Analysis Signal Demodulation and Numerical Simulation of a Quasi-Distributed Optical Fiber Sensor Based on FDM/WDM Techniques and Fabry-Pérot Interferometers
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Signal Analysis Signal Demodulation and Numerical Simulation of a Quasi-Distributed Optical Fiber Sensor Based on FDM/WDM Techniques and Fabry-Pérot Interferometers

机译：基于FDM / WDM技术和法布里-珀罗干涉仪的准分布式光纤传感器的信号分析信号解调和数值模拟

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摘要

In civil engineering quasi-distributed optical fiber sensors are used for reinforced concrete monitoring, precast concrete monitoring, temperature monitoring, strain monitoring and temperature/strain monitoring. These quasi-distributed sensors necessarily apply some multiplexing technique. However, on many occasions, two or more multiplexing techniques are combined to increase the number of local sensors and then the cost of each sensing point is reduced. In this work, a signal analysis and a new signal demodulation algorithm are reported for a quasi-distributed optic fiber sensor system based on Frequency Division Multiplexing/Wavelength Division Multiplexing (FDM/WDM) and low-precision Fabry-Pérot interferometers. The mathematical analysis and the new algorithm optimize its design, its implementation, improve its functionality and reduce the cost per sensing point. The analysis was corroborated by simulating a quasi-distributed sensor in operation. Theoretical analysis and numerical simulation are in concordance. The optimization considers multiplexing techniques, signal demodulation, physical parameters, system noise, instrumentation, and detection technique. Based on our analysis and previous results reported, the optical sensing system can have more than 4000 local sensors and it has practical applications in civil engineering.
机译：在土木工程中，准分布式光纤传感器用于钢筋混凝土监测，预制混凝土监测，温度监测，应变监测和温度/应变监测。这些准分布式传感器必须应用某种复用技术。然而，在许多情况下，两种或多种多路复用技术被组合以增加本地传感器的数量，然后降低了每个感测点的成本。在这项工作中，针对基于频分复用/波分复用（FDM / WDM）和低精度法布里-珀罗干涉仪的准分布式光纤传感器系统，报告了信号分析和新的信号解调算法。数学分析和新算法优化了其设计，实现，改善了功能并降低了每个传感点的成本。通过模拟运行中的准分布传感器来证实该分析。理论分析与数值模拟是一致的。该优化考虑了多路复用技术，信号解调，物理参数，系统噪声，仪器和检测技术。根据我们的分析和先前报告的结果，该光学传感系统可以具有4000多个本地传感器，并且在土木工程中具有实际应用。

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