基于激光泵浦的钾光泵磁力仪关键技术研究

项目名称： 基于激光泵浦的钾光泵磁力仪关键技术研究

项目编号： No.61503283

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 自动化技术、计算机技术

项目作者： 杨颖

作者单位： 天津职业技术师范大学

项目金额： 20万元

中文摘要： 精确获取海洋磁场信息是水下机器人实现高精度地磁导航的先决条件。现有海洋磁力仪存在气体放电灯谱单色性差、强度低、共振元素光谱重叠等问题，磁测灵敏度难以满足深远海导航系统的要求。本项目基于激光泵浦、射频磁场对钾原子的作用机理，研究基于激光泵浦的钾光泵磁力仪，预期实现0.001nT/√Hz的磁测灵敏度。基于塞曼效应、激光光泵及磁共振研究系统磁测机理。研究钾原子在射频磁场中的运动机理及磁共振信号角相关性，揭示系统参数对磁测灵敏度、信噪比的影响机制。通过分析渐变磁场中钾原子超精细结构的塞曼效应对磁共振信号的影响机制，建立宽量程磁测模型。研究磁共振信号检测方法，主要突破基于无调制原子二向色性的激光稳频、数字锁相放大器、基于粒子群算法的磁共振点快速定位等关键技术。研究系统噪声理论，应用盲源分离分析噪声源。项目研究成果对高精度海洋磁力仪研究具有重要的理论价值，为实现高精度水下导航提供了新的技术途径。

中文关键词： 磁场；钾光泵磁力仪；海洋磁力仪；激光泵浦；粒子群算法

英文摘要： The prerequisite of underwater robot with high precision geomagnetic navigation is acquiring the marine magnetic field accurately. However, the resolution of existing marine magnetometers can not meet the requirements of high precision navigation system for deep sea because of some drawbacks such as poor monochromaticity, low light intensity of gas discharge lamp and spectral overlap of resonant vapor. In light of this, this project focuses on the basic mechanism of impact between potassium atoms and laser light in magnetic environment to establish a potassium magnetometer basing on laser pumping, which is expected to achieve magnetic measurement sensitivity of 0.001nT/√Hz. Magnetic measuring principle is analysed based on Zeeman effect, laser pumping and magnetic resonance. The movement mechanism of potassium atoms in magnetic environment and the angular correlation of magnetic resonance signal are researched in order to reveal the influence mechanism between laser parameters and magnetic measurement sensitivity and signal-to-noise ratio. The influence mechanism between Zeeman effect of potassium atoms with hyperfine structure and magnetic resonance signals are researched to establish the magnetic measurement model that can be used in wide range. Digital signal detection system contains laser frequency stabilization basing on modulation-free atomic dichroism, digital lock-in amplifier and particle swarm optimization for quick positioning. Magnetic measurement system noise theory is researched. In addition, blind source separation is used to analyse the error source in order to extract weak signals. All these research has great point in the improvement of high precision marine magnetometer and paves new way for high precision underwater navigation.

英文关键词： Magnetic field;Potassium optically pumped magnetometer;Marine magnetometer;Laser pumping;Particle swarm optimization