| 基于自动消偏的原子陀螺微弱光信号检测方法 |
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| 引用本文： | 王婧,周斌权,吴文峰,陈琳琳,赵兴华,梁晓阳,刘刚.基于自动消偏的原子陀螺微弱光信号检测方法[J].红外与激光工程,2018,47(8):817004-0817004(6). |
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| 作者姓名： | 王婧 周斌权 吴文峰 陈琳琳 赵兴华 梁晓阳 刘刚 |
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| 作者单位： | 1.惯性技术国家级重点实验室,北京 100191; |
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| 基金项目： | 国家自然科学基金（61627806，61227902） |
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| 摘 要： | 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。
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| 关 键 词： | 核磁共振陀螺 微弱信号放大 自动消偏 差分检测 |
| 收稿时间： | 2018-03-05 |
Weak light signal detection method for atomic gyroscope based on automatic zeroing of the bias |
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| Affiliation: | 1.National Key Laboratory of Inertial Technology,Beijing 100191,China;2.School of Instrument Science and Opto-electronics Engineering,Beihang University,Beijing 100191,China |
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| Abstract: | Nuclear Magnetic Resonance Atomic Gyroscope has attracted an extensive attention due to its high precision, compact size and less cost at home and abroad. Among numerous techniques for obtaining the detection target, the balanced polarimetry technique is a more general method which monitors the rotation of the polarization plane of the probe beam. Due to miniaturization installation, the size effect is obvious. So there is an inevitable azimuth deviation between optical elements that leads to a bias of the weak optical signal, which extremely restricts the extraction and amplification. For the purpose of improving the detection performance, the differential detection principle of the laser polarization was analysed and a circuit method was proposed which could automatic eliminate the photodiode current bias based on the proportional-integral (P-I) feedback loop. A low-noise and high-gain preamplifier for silicon photodiode was presented. Finally, combined with the NMRG prototype system, the simulation analyses and experimental results were given, which verified the validity of this method. |
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