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为了提高光纤光栅(FBG)传感系统的传感容量以及传感器的实际工程生存能力和后期可维护性,提出了一种基于光频域反射(OFDR)技术的总线型拓扑结构的FBG传感系统。利用OFDR技术,采用相同波长的FBG传感器,克服了光源带宽对系统传感容量的限制,极大提高了系统的传感器复用能力和空间分辨率。与传统的采用弱反射率FBG串联组网相比,本文系统采用强反射率FBG和光分路器实现总线型拓扑结构,在提高传感器的生存能力的同时,克服了串接式FBG传感网络中存在的多重反射和光谱阴影对测量精度的影响。温度实验表明,系统的波长重复性为±4pm。
In order to improve the sensing capacity of FBG sensing system and the actual engineering survivability and the maintainability of the sensor, a FBG sensor system based on OFDR (Optical Frequency Domain Reflectometry) technology is proposed . Using OFDR technology, the FBG sensor of the same wavelength is adopted to overcome the limitation of the light source bandwidth on the sensing capacity of the system and greatly improve the system’s sensor multiplexing capability and spatial resolution. Compared with the traditional FBG serial networking with weak reflectivity, the system uses a high reflectivity FBG and an optical splitter to achieve a bus topology. While improving the survivability of the sensor, it overcomes the disadvantages of the serial FBG sensor network The Influence of Multiple Reflections and Spectral Shadows on Measurement Accuracy. Temperature experiments show that the system wavelength repeatability of ± 4pm.