1 惯性技术国家级重点实验室, 北京 100191
2 北京航空航天大学 仪器科学与光电工程学院, 北京 100191
核磁共振原子陀螺凭借其高精度、小体积、低成本的特点在国内外受到广泛关注。在获取检测目标的诸多方法中, 较为常用的方法是监测探测光极化面旋转角的平衡偏振法。由于小型化带来的尺寸效应明显, 光学元件间存在不可避免的方位误差, 导致微弱光信号产生偏置, 制约了该信号的提取与放大。为提高检测性能, 分析了激光偏振态的差分检测原理, 提出了一种基于比例积分(P-I)反馈回路的自动消偏方法, 设计了基于硅光二级管的低噪声、高增益前置放大电路。最后, 结合核磁共振陀螺样机系统, 给出了该方法的仿真分析和实验结果, 验证了该方法的有效性。
核磁共振陀螺 微弱信号放大 自动消偏 差分检测 NMRG weak signal amplify automatic zeroing of the bias differential detection 红外与激光工程
2018, 47(8): 0817004
Author Affiliations
Abstract
1 School of Instrumentation Science and Opto-Electronics Engineering, Beihang University, Beijing 100191, China
2 Key Laboratory on Inertial Technology, Beijing 100191, China
In this Letter, the liquid crystal variable phase retarder is applied for the accurate modulation of the laser power in a detection system and the construction of a system that suppresses the influence of laser noise on the gyro’s bias instability. A closed-loop control method for a laser noise suppression system is proposed. We obtain a power stability index of 0.038% in a 3-h continuous test, and the nuclear magnetic resonance gyroscope bias instability reaches 1°/h. The proposed control method effectively improves the signal-to-noise ratio of the gyroscope detection signal, which lays the technical foundation for future research work.
230.0230 Optical devices Chinese Optics Letters
2017, 15(8): 082302
