双原子磁强计组合避免死区方法研究

Sensors and PartsResearch on the dead zone avoidance method for the combination of dual atomic magnetometers

关键词:  地磁场  原子磁强计  测量死区  电子顺磁共振

Key words:  Geomagnetic field  Atomic magnetometer  Dead zone  Electron paramagnetic resonance

摘要:

工作于地磁背景下的原子磁强计搭载于移动平台进行磁场测量时，在其探头方向与磁场方向间的某些夹角区域内，原子磁强计无法正常工作，即存在测量死区。通过理论分析测量死区的产生机理，提出了一种在实际应用中避免死区的双原子磁强计组合的通用方法。该方法将2台原子磁强计组合放置在实际测量位置处，即使安装平台姿态角在一定范围内变化，也至少有1台原子磁强计处于正常工作状态，从而有效地避免死区。通过建立双原子磁强计组合数学模型，根据实际地磁场方向和安装平台姿态角变化条件进行仿真实验研究，获得了最优组合方案，并在测试平台上进行了实验验证。在平台姿态角旋转变化为α∈［0°,180°］、俯仰角变化为β∈［－40°,40°］的条件下，实现了有效避免测量死区，结果表明该方法具有实用价值。

Abstract:

When an atomic magnetometer operating in the geomagnetic background is mounted on a mobile magnetic field measurement platform, within certain angular ranges between the probe direction and the magnetic field direction, the atomic magnetometer cannot operate properly. These areas are known as dead zones. Through theoretical analysis of the dead zone generation mechanism, a generalized method is proposed to avoid dead zones in a combination of two atomic magnetometers in practical applications. This method places two atomic magnetometers combinatorially at the actual measurement position, which makes at least one of the two atomic magnetometers is in the normal operating state within a certain range of changes in the attitude angle of the atomic magnetometer mounting platform, and thus effectively avoids the dead zone. By establishing the mathematical model of the dual atomic magnetometer, a simulation experimental research is carried out according to the actual geomagnetic field direction and the conditions of the attitude angle change of the mounting platform. The optimal combination scheme is obtained and the experiment is carried out on the test platform. Finally, the effective avoidance of dead zone is realized when the platform attitude angle rotation is varied as α∈［0°,180°］ and pitch angle is varied as β∈［－40°,40°］. The result shows that the method has practical value.