一种提高快速光纤珐-珀非扫描式相关解调系统信号稳定性的算法  

An Algorithm for Improving the Signal Stability of the Fast Fiber Optic Fabry-Perot Nonscanning Correlation Demodulation System

作　　者：李钧寿 朱永[1] 王宁[1] 李健宁[1] 

机构地区：[1]重庆大学光电工程学院光电技术与系统教育部重点实验室,重庆400044

出　　处：《光子学报》2015年第1期85-91,共7页Acta Photonica Sinica

基　　金：中央高校基本科研业务项目(No.106112013CDJZR120008)资助

摘　　要：光纤珐-珀非扫描式相关解调系统的解调速度是限制其应用的一个关键问题.本文提出了基于超辐射发光二极管的快速光纤珐-珀非扫描式相关解调系统,分析了该系统的光学模型和信号特性,设计了基于小波包络提取的信号稳定性算法.理论计算表明:噪声使系统采用最大值解调时有4.33%的误差,而采用小波提取包络最大值解调算法能使解调误差仅为0.33%.研制了快速光纤珐-珀非扫描式相关解调仪,并验证了该算法的可行性.当实验系统解调频率为1.5kHz时,采用该算法解调,解调的腔长误差仅为5nm.实验结果表明:该方法有效地提高了系统的稳定性和解调准确度,为快速光纤珐-珀非扫描式相关解调法的稳定解调提供了一种有效的算法.The demodulation speed has become the key issue limiting the application of fiber optic FabryPerot nonscanning correlation demodulator.A fast fiber-optic Fabry-Perot（F-P）nonscanning correlation demodulator based on Super Luminescent Diode（SLD） was proposed,its principle and signal characteristics were analyzed.To improve the signal stability,envelope detection based on wavelet was presented.Theoretical calculations show that the error of the result is only 0.33% with this algorithm,while the error is 4.33% without it.A experimental prototype was made and tested,when the demodulation speed is 1.5 KHz,the demodulation erorr is only 5 nm with this algorithm.The experimental results indicate that envelope detection based on wavelet can improve the demodulation stability and accuracy of the fast fiber optic Fabry-Perot nonscanning correlation demodulation system,providing a stable and efficient algorithm for the fast fiber optic Fabry-Perot nonscanning correlation demodulation system.

关 键 词：光纤传感 光纤珐-珀 相关解调 算法 稳定性 

分 类 号：TP212.6[自动化与计算机技术—检测技术与自动化装置]