中国激光, 2018, 45 (5): 0510002, 网络出版: 2018-05-02
基于FPGA的分布式光纤传感系统偏振控制研究 下载: 906次
Research on Polarization Control of Distributed Optical Fiber Sensing System Based on FPGA
传感器 分布式光纤传感 偏振控制 现场可编程门阵列 改进和声搜索算法 定位误差 sensors distributed optical fiber sensing polarization control field programmable gate array improved harmony search algorithm positioning error
摘要
为了消除基于双马赫-曾德尔干涉的分布式光纤传感系统中偏振退化和偏振相位漂移对定位性能的影响, 提出了一种结构简单、效率高的基于现场可编程门阵列(FPGA)的偏振控制方法。该方法采用偏振控制器反馈技术, 以两路光信号的反馈值作为控制函数, 结合改进的和声搜索(IHS)算法, 利用FPGA硬件并行结构和流水线技术快速实现算法迭代并控制偏振控制器调整偏振态。实验结果表明, 该方法能够在短时间内调整系统偏振态, 偏振控制时间约为0.7808 s, 系统的定位精度提高到±20 m以内, 有效地消除了偏振效应对定位性能的影响;另外以FPGA代替计算机作为系统的控制核心, 提升了数据处理速度, 缩短了偏振控制时间, 提高了系统集成度从而有利于实现偏振控制仪器的小型化。
Abstract
In order to eliminate the influence of polarization-induced fading and polarization-induced phase shift on the positioning performance in a dual Mach-Zehnder interferometry disturbance sensing system, a polarization control method based on field programmable gate array (FPGA) with simple structure and high efficiency is proposed. The method adopts polarization controller feedback technology and uses feedback values of two optical signals as control functions. In combination with the improved harmony search (IHS) algorithm, the FPGA hardware parallel structure and pipeline technology are used to rapidly implement the algorithm iteration and control the polarization controller to adjust the polarization state. The experimental results show that the method can adjust the polarization state of the system in a short time, the polarization control time is about 0.7808 s, and the positioning error of the system is improved up to within ±20 m, which effectively eliminate the polarization effect on the positioning performance. Besides, the use of FPGA instead of the computer as the control core of the system improves the data processing speed, reduces the polarization control time, and improves the integration of system, thereby facilitating the miniaturization of the polarization control instruments.
李鹏程, 刘琨, 江俊峰, 潘亮, 马鹏飞, 李志辰, 张炤, 李鑫, 刘铁根. 基于FPGA的分布式光纤传感系统偏振控制研究[J]. 中国激光, 2018, 45(5): 0510002. Li Pengcheng, Liu Kun, Jiang Junfeng, Pan Liang, Ma Pengfei, Li Zhichen, Zhang Zhao, Li Xin, Liu Tiegen. Research on Polarization Control of Distributed Optical Fiber Sensing System Based on FPGA[J]. Chinese Journal of Lasers, 2018, 45(5): 0510002.