基于同频调制解调的谐振式光纤陀螺仪  

Resonant fiber optic gyroscope based on the reciprocal modulation-demodulation technique

作　　者：刘路 刘霜 钱伟文 李汉钊 马慧莲 金仲和[1] LIU Lu;LIU Shuang;QIAN Weiwen;LI Hanzhao;MA Huilian;JIN Zhonghe(School of Aeronautics and Astronautics,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学航空航天学院,杭州310027

出　　处：《中国惯性技术学报》2021年第4期532-535,540,共5页Journal of Chinese Inertial Technology

基　　金：国家自然科学基金(62175218,61675181)。

摘　　要：谐振式光纤陀螺仪(RFOG)是一种基于Sagnac效应的高精度惯性角速度传感器,具有灵敏度高,全固态结构,有利于小型化等各种优点。为有效抑制各种噪声以提高陀螺检测精度,同时进一步降低系统的复杂度以便于集成,提出了一种基于同频调制解调技术的谐振式光纤陀螺方案,从理论上指导了大幅度改善顺逆时针光路的互易性,有效抑制激光器频率噪声和相位调制器残余强度调制影响的机理。在前期实验的基础上加入第二闭环,完成了采用23 m谐振腔的集成化RFOG样机的研制。常温测试结果表明,与Honeywell公司研制的基于三光源拍频方案,腔长为100 m的RFOG样机相比,零偏不稳定性基本相同,但在陀螺角度随机游走上具有明显优势。The resonant fiber optic gyroscope(RFOG)based on the Sagnac effect is a kind of rotation velocity sensors which has various advantages,such as the high sensing accuracy,compactness,beneficial for miniaturization and so on.In order to improve the gyro sensitivity by suppressing the optical noises in the RFOG system,while further reducing the system complexity for easy integration,a RFOG scheme based on a reciprocal modulation-demodulation technique is proposed,which greatly improves the reciprocity of clockwise and counterclockwise optical paths,and the influence of the laser frequency noise and the residual amplitude modulation of the phase modulators are well suppressed.A second closed loop is added on the basis of the previous experiment.An integrated RFOG prototype with a 23-m long fiber ring resonator is fully developed.The experimental results at room temperature show that the proposed RFOG prototype has almost the same zero bias instability as that of the RFOG prototype based on the multi-frequency laser source scheme with 100 m long resonator developed by Honeywell,but has obvious advantages in gyroscopic angle random walk.

关 键 词：谐振式光纤陀螺仪 同频调制解调技术 RFOG样机 

分 类 号：V241.5[航空宇航科学与技术—飞行器设计]