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基于光纤Bragg光栅技术和光频域反射(OFDR)技术,构建了一个具有分立式传感子层和分布式传感器子层的双层结构混合式光纤传感网络。在分立式传感子层中,FBG用于实现温度参量的传感;在分布式传感子层中,采用OFDR方法解调光纤中的瑞利散射信息从而获得分布式的应变参量。整个传感网络共用同一个宽光谱可调谐激光光源,分立式子层和分布式子层两者协同工作,实现应变和温度两个参量的高精度测量,其中应变分辨率达到0.75με,温度分辨率达到±1℃。本文构建的传感网络为构建大容量、大规模、多参量、高空间分辨率和高测量精度的光纤传感网络提供了一种有益探索。
Based on fiber Bragg grating technology and optical frequency domain reflection (OFDR) technology, a two-layer hybrid optical fiber sensing network with discrete sub-layers and distributed sensor sub-layers is constructed. In the discrete sensing sublayer, FBG is used to sense temperature parameters. In the distributed sensing sublayer, OFDR is used to demodulate Rayleigh scattering information in the fiber to obtain distributed strain parameters. The whole sensing network shares the same wide-spectrum tunable laser light source, and both the discrete sub-layer and the distributed sub-layer work together to achieve high-precision measurement of strain and temperature, in which the strain resolution reaches 0.75με, the temperature Resolution of ± 1 ℃. The sensor network constructed in this paper provides a useful exploration for constructing an optical fiber sensing network with large capacity, large scale, multi-parameter, high spatial resolution and high measurement accuracy.