基于FPGA的时延辅助定位FBG传感系统的研究与设计

An FPGA time delay auxiliary positioning based optical FBG sensing system

由于受光源谱宽和光纤Bragg光栅传感波长移动范围的限制,FBG传感系统中可复用的FBG数量受到很大限制。为了解决这种限制问题,提出通过传感信号的时间延迟对传感FBG进行定位的方法。设计出基于FPGA的时延辅助定位FBG传感系统,用Fabry-Peror(F-P)腔和时延定位结合的方式对传感信息进行解调,用FPGA进行数据处理。搭建了实验系统,进行了简单的实验。实验结果表明,本文系统增加可复用FBG数量的方法实用性强,精度高。

Because of the wide range of the light source spectral width and optical fiber Bragg grating sensing wavelength mobile range, the number of multiplexed fiber Bragg gratings in the fiber grating sensing system is greatly limiteck If there are too many fiber gratings,it will cause the interference be- tween the codes in the fiber. In order to solve this problem,in this paper,we propose the method of the time delay localization,which uses the time delay of the sensing signal to locate the sensing fiber Bragg gratings. We design a time delay auxiliary positioning optical fiber Bragg grating sensing system. This system works on the basis of field--programmable gate array （FPGA）. It works with the demodulation through the combination of F-P cavity and time delay localization method and processing the data through FPGA. In accordance with the system design,we have built up an experimental system and car- ried out a simple experiment. We present the experimental results, which show that the method can in- crease the number of multiplexed gratings and it is practical and highly accurate.