使用滤波器和探测器阵列的光纤陀螺光源平均波长漂移监测  

Light source mean wavelength shift monitoring in fiber optic gyroscope with filter-detector array

作　　者：谢良平 宫晓宇[2] 张春熹 XIE Liangping;GONG Xiaoyu;ZHANG Chunxi(School of Instrumentation Science and Opto-Electronics Engineering,Beihang University,Beijing 100191,China;The Flight Automatic Control Research Institute of Aviation Industry Corporation of China,Xi’an 710065,China)

机构地区：[1]北京航空航天大学仪器科学与光电工程学院,北京100191 [2]中国航空工业集团公司西安飞行自动控制研究所,西安710065

出　　处：《中国惯性技术学报》2019年第6期799-803,共5页Journal of Chinese Inertial Technology

基　　金：装备预先研究基金项目(41417010102)资助

摘　　要：为了提升光纤陀螺在工作温度范围内的标度因数稳定性,提出了一种使用滤波器和探测器阵列对光源光谱平均波长漂移进行实时监测的技术方案。光纤陀螺光源光谱通常为平滑的类高斯函数,理论上可以借助少数采样点在较小的误差范围内计算其积分值,因此可以测量光源几个特定波长处的光强,结合适当的数值积分算法,计算其平均波长漂移。以掺铒光纤光源的左峰(中心波长约1530 nm)为例,分析了滤波器参数以及积分方法对监测精度的影响,结果表明当初级滤波器带宽为5 nm,次级滤波器带宽为1 nm,采用Gauss-Legendre积分法时,计算值与测量值的误差小于0.2×10^-6。实时监测结果可用于波长反馈控制或标度因数补偿,进一步提升光纤陀螺的环境适应性。In order to improve the scale factor stability of the fiber optic gyroscope(FOG) within the operating temperature range, a light source mean-wavelength shift monitoring scheme based on filter-detector array is proposed. The light source spectrum in FOG is usually a smooth Gaussian-like function, whose integral value can be theoretically estimated with the help of a few sampling points within small error range. Therefore, the average wavelength shift of the light source can be calculated by measuring the intensity of the light source at several specific wavelengths combining with using an appropriate numerical integration algorithm. Taking the left peak of the erbium-doped fiber super fluorescent source(the central wave-length is about 1530 nm) as an example, the influences of filter parameters and integration method on the monitoring accuracy are analyzed, which show that the difference between the calculated wave-length shift and the actual one could be smaller than 0.2×10^-6 by the proposed Gauss-Legendre integration method when the primary and the secondary filter bandwidths are 5 nm and 1 nm, respectively. These real-time monitoring results can be used for wavelength feedback control and scale factor compensation to further improve the FOG’s environmental adaptability.

关 键 词：光纤陀螺 光源 平均波长 标度因数稳定性 数值积分 

分 类 号：V241.5[航空宇航科学与技术—飞行器设计]