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分析了副载波调频技术用于光纤光栅阵列查询的基本原理。从理论上推算了系统的查询空间分辨率及查询范围,并结合波分复用技术进行了光纤光栅传感网络的地址查询演示实验,同时使用可调谐滤波器对每个光栅信号进行了解调。实验结果很好地说明了该查询方案的可行性,且在单个光栅上的被测应变与可调谐滤波器的控制电压呈较好的线性关系。该系统具备有查询由几百个FBG组成的传感网络的潜在能力。
The basic principle of using subcarrier frequency modulation technology for fiber array interrogation is analyzed. The query spatial resolution and the query range of the system are theoretically deduced. The address query demonstration experiment of FBG sensor network is carried out in combination with the WDM technology. At the same time, each grating signal is demodulated using a tunable filter. The experimental results illustrate the feasibility of the proposed scheme, and the measured strain on a single grating shows a good linear relationship with the control voltage of the tunable filter. The system has the potential to query a sensor network consisting of hundreds of FBGs.