布里渊光纤陀螺增大动态范围新方案  

New scheme of increasing dynamic range of Brillouin fiber optic gyroscope

作　　者：洪伟[1] 李绪友[1] 杨汉瑞[1] 赵春兰[1] 杨慧慧[1] 

机构地区：[1]哈尔滨工程大学自动化学院,哈尔滨150001

出　　处：《中国惯性技术学报》2011年第1期106-110,共5页Journal of Chinese Inertial Technology

基　　金：国家自然科学基金资助项目(60604019)

摘　　要：针对布里渊光纤陀螺动态范围较小的问题,在比较了以往各种方案动态范围的基础上,提出了一种基于光强补偿的布里渊光纤陀螺动态范围增大方案。该方案使用大功率窄带激光器做泵浦源,在光路中引入光衰减器以及分光比不对称的耦合器,并通过反馈回路对两路光光强进行实时调节,从而可以消除泵浦游走效应对布里渊光纤陀螺动态范围的影响。通过分析和仿真结果可知,该方案改进后的布里渊光纤陀螺拥有理论上的无限动态范围,同时该陀螺的克尔效应也得到了抑制,抑制程度取决于光源的强度噪声误差量。最后对改进后方案的检测精度进行了分析,结果表明该方案对布里渊光纤陀螺的检测精度不产生影响。The dynamic range of Brillouin fiber optic gyroscope is narrow.To solve this problem,a new scheme based on light intensity compensation was designed after comparing most of the past methods.This scheme adopts the following measures to removes the influences of pump walk-off effect： High-power narrow-band laser was used as the pump source;The light path applies light intensity attenuator and the coupler with unbalanced intensity coupling coefficients;and the light intensities of the two paths were real-time adjusted by feedback loop.The results of analysis and simulation show that the improved Brillouin fiber optic gyroscope has theoretical unlimited dynamic range,and the Kerr effect of the gyro can be restrained with the restraining degree depending on the light source intensity noises.Finally,the detection accuracy of the new scheme is analyzed,and the results show that the detection accuracy of Brillouin fiber optic gyroscope is not affected by this scheme.

关 键 词：布里渊 光纤陀螺 动态范围 克尔效应 

分 类 号：U666.1[交通运输工程—船舶及航道工程]