第21卷第11期 2013年11月
文章编号1004-924X(2013)11-2785-06
光学精密工程
Optics and Precision Engineering
基于线性滤波器的布拉格光纤光栅
解调系统的稳定性王喜昌，庞启，徐文军，杨尚明，王中训（烟台大学光电信息学院，山东烟台264005）
Vol. 21No.11
Nov.2013
摘要：基于线性滤波器的解调法是通过探测两路光的光功率比值来确定外界温度和压力变化的。本文通过实验证明了在相同的度或压力下，随着光源总功率减少，两路光的比值不相同，从而影响了系统的稳定性。为了提高系统的稳定性，对两路光功率的变化进行了分析，找到了背景噪声是影响两路光比值变化的基本原因，并对背景噪声进行了处理。实验结果表明，处理背景噪声后的光纤布拉格(FBG)传感器在不同的温度环境下并改变光源功率大小时，比值较恒定，
系统具有很好的稳定性。该修正方法同样适用于应变和压力等实验中系统稳定性的测量。关键词：光纤传感器；解调系统；噪声分析；光纤布拉格光栅(FBG)；线性滤波
中图分类号：TN253
文献标识码：A
doi:10, 3788/OPE. 20132111., 2785
StabilityofdemodulationsystemforfiberBragggrating
based onlinearfilter
WANG Xi-chang,PANG Qi', XU Wen-jun, YANG Shang-ming, WANG Zhong-xun(InstituteofOpto-electronicInformation,YantaiUniversity,Yantai264005,China)
Correspondingauthor，E-mail:pangqi429@163.com
Abstract: The demodulation based on a linear filter determines the changes of external temperatures and pressures according to the ratio of optical powers from two beams. However, this paper points out that the ratio of two beams changes with the reduction of total powers of a light source under the same state of temperature and pressure by practical experiments and it effects the system stability seri-ously. In order to improve the stability of the system, this paper analyzes the changes of ratio of opti cal power from two beams, and obtains that the background noise is the significant reason that affects the two beams' ratio. Then it processes the background noise by a processed method. The experiment result shows that the Fiber Bragg Grating (FBG) sensor has a constant ratio under different tempera tures and changed light source powers after processing the background noise. Experiments demon strate that the method has improved the stability of the system and it also applies to the stability measurement in strain and pressure experiments.
Key words: optical fiber sensor; demodulation system; noise analysis; Fiber Bragg Grating(FBG);
linear filtering
收稿日期：2012-11-15；修订日期：2013-01-28.
基金项目：山东省省级攻关计划资助项目（No.W1.10K28）