光纤法珀压力传感器数据解调及改进算法研究  

Study of Improved Algorithm about Data Demodulation of Fiber Optic F-P Pressure Sensing System

作　　者：曹群[1] 贾平岗[1] 杨兵[1] 张海瑞[1] 洪应平[1] 熊继军[1] 

机构地区：[1]中北大学电子测试技术重点实验室仪器科学与动态测试教育部重点实验室,山西太原030051

出　　处：《仪表技术与传感器》2015年第12期15-18,共4页Instrument Technique and Sensor

基　　金：国家杰出青年科学基金项目(51425505);青年科学基金项目(51405454)

摘　　要：基于光纤法珀压力传感器的基本原理,针对相位解调方法中的条纹计数法,提出了优于双峰解调法的多峰平均改进算法,通过滤波实现数据预处理,进而寻找周期内所有数据点的局部极值点,然后根据格拉布斯准则剔除粗大误差,最终得到腔长变化与压力的关系曲线。在此基础上通过MATLAB进行理论仿真,搭建光纤传感压力测试系统并进行了相关实验,利用所设计的解调方法对实验数据进行处理,通过对比分析实验结果可知,改进算法可以明显的抑制应变测量系统误差,提高腔长的稳定性,证实了该改进算法具有较高的可行性。Based on the sensing principle of optical fiber F-P pressure sensor,a kind of multi-peaks average improved algorithm better than peak-peak method was proposed in view of the fringe counting method during phase demodulation method. Data preprocessing was realized through filter function and then the total local extremum points of one cycle were found. According to Grubbs criterion,gross errors were eliminated to obtain the relationship curve between cavity length change and pressure applied.On the basis,theoretical simulation was established using MATLAB and related experiments were taken on after the implementation of optical fiber sensing pressure testing system. By employing the designed demodulation method to complete the comparative analysis of the experimental results,the improved algorithm can significantly inhibit the indeterminacy of strain measurement system and enhance the stability of the cavity length,thus confirming the method of MEMS optical fiber pressure sensing system performs a potential high possibility.

关 键 词：光纤法珀传感 数据处理 光谱解调 改进算法 多峰计算 MATLAB 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]