正弦波调制的光纤环本征频率测量方法  

Method for fiber ring eigenfrequency by sine wave modulation

作　　者：陈宇中[1] 宋章启[1] 张学亮[1] CHEN Yuzhong;SONG Zhangqi;ZHANG Xueliang(College of Meteorology and Oceanology,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学气象海洋学院,湖南长沙410073

出　　处：《国防科技大学学报》2017年第6期193-196,共4页Journal of National University of Defense Technology

基　　金：国家部委基金资助项目(51302040302)

摘　　要：为了弥补传统光纤环本征频率测量方法中方波调制存在死区的缺陷,提出正弦波调制的本征频率测量方法。对正弦波调制下的光纤陀螺输出信号进行分析,得到二次谐波幅度与调制频率间的二次函数关系,通过计算抛物线顶点即可求得本征频率。依据该原理对已有的光纤陀螺进行升级改造,研制了一套本征频率测量系统。试验结果表明:该方法可达到1×10-5的测量精度,是一种成本低、精度高的光纤环本征频率测量方法。A new measuring method for fiber ring eigenfrequency was presented.Different from the common square wave modulating,the new method is based on the sine wave modulation,so the problem of dead zone was solved.The output signal of fiber optic gyroscope was analyzed when using sine wave modulation,quadratic relationship was obtained between second harmonic and modulation frequency,eigenfrequency can be obtained by calculating the parabolic vertex.On the basis of the new method,a test system was developed by updating fiber optic gyroscope system.Test result shows that the measuring precision of 10 ppm can be achieved,which shows that the proposed method is a method with low cost and highprecision method for fiber ring eigenfrequency.

关 键 词：光纤陀螺 光纤环 本征频率 正弦波调制 二次谐波 

分 类 号：V241.5[航空宇航科学与技术—飞行器设计]