基于OTDM的FBG传感器网络超高速解调系统的设计

摘要

Based on the principle of fiber Bragg grating( FBG)and optical time-division multiplexing( OTDM) ,a high-speed demodulation scheme for the matched-grating strain sensor network is proposed. Ultra-high speed demodulation system for multiple FBG senor channels is achieved using FPGA +ARM circuit design. Especially, the noise effect brought by either light path or circuit is significantly suppressed using a composite filtering algorithm,and the variation range of the peak power is reduced from ?.03dB to ?.31 dB. The designed system can be used in various environments and has important reference value.%基于光纤Bragg光栅(FBG)和光时分复用(OTDM)的基本原理研究匹配光栅应变传感器网络的高速解调问题.给出了运用FPGA+ARM的匹配光栅应变解调系统设计,实现了多个FBG信道的同时监测.重点在通过寻峰算法寻到峰值的情况下,结合一种复合滤波算法(限幅法+滑动滤波法),极大地抑制了光路和电路中产生的噪声,将峰值功率变化范围由-1.03 dB压缩到-0.31 dB,使得所设计的系统能够在多种环境中应用,具有重要的参考价值.