光纤磁场传感器信号解调方法及仿真研究  

Analysis and Simulation of Signal Processing in Magnetostrictive-fiber Magnetic sensor

作　　者：张琦[1] 潘孟春[1] 辛建光[1] 胡佳飞[1] 

机构地区：[1]国防科技大学机电工程与自动化学院,湖南长沙410073

出　　处：《计算机测量与控制》2009年第8期1635-1637,共3页Computer Measurement &Control

摘　　要：为了减少相位随机漂移和1/f噪声对信号检测灵敏度的影响,基于磁致伸缩效应的光纤干涉型磁场传感器必需在传感臂或参考臂施加高频调制磁场;考虑负载效应、退磁效应,给出了光纤/磁致伸缩耦合结构的等效应变;采用相位载波(PGC)外调制方案,在参考臂施加高频调制磁场,根据贝塞尔函数展开式,建立了被测磁场与载波磁场振幅、调制磁场振幅之间的关系式;借助Matlab/Simu-link,对相位解调方法进行仿真,仿真结果与理论分析结果十分吻合;研究了输出信号幅值随调制磁场幅值变化的趋势,得到高频调制磁场幅值的最优值。In order to reducing random phase excursion and 1/f noise, the sensor arm or the reference arm of magnetostrictive fiber optic magnetic sensor based on Mach--Zender interferometer must be in a high--frequency magnetic field. The equivalent strain of fiber--magnetostrictive coupling structure is deduced according to loading and demagnetizing effect. The phase generated carrier （PGC） technique is stud- fed in which the detected field and a high frequency carrier magnetic field are in sensor arm while a low frequency modulating one is in reference arm. Based on theory about magnetostrictive and M Z interferometer, the correlation expression between the detected magnetic field and other two fields is given with Bessel function. Lastly, the simulation about the method is done using Matlab/Simulink and simulation results accord with theoretic results. The relationshi Pbetween output signal amplitude and high frequence magnetic field amplitude is analysed and the optimization amplitude of high frequence magnetic field is achieved.

关 键 词：磁致伸缩 光纤传感器 相位载波调制 贝塞尔 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]