论文部分内容阅读
本文提出一种补偿地磁场的方法。地磁场的恒定分量用一个可动的 Fanselau线圈补偿,所用的“零场”检测器是磁通门磁强计。地磁场的垂向变化用专门的磁通门磁强计反馈环路进行补偿。获得残余磁场小于10nT,垂直分量不稳定性小于0.5nT。“跟随误差”是由于工作区距补偿区不够远所引起的,可用测量、归算的方法修正。本方法已用于弱磁场中测定γ′p,此时跟随误差小于1×10~(-7),而不确定性优于1×10~(-6)。
This paper presents a method to compensate for the geomagnetic field. The constant component of the geomagnetic field is compensated by a movable Fanselau coil. The “zero field” detector used is a fluxgate magnetometer. Vertical changes in the geomagnetic field with a special fluxgate magnetometer feedback loop to compensate. The residual magnetic field is less than 10 nT and the vertical component instability is less than 0.5 nT. “Following error” is due to the work area is not far enough from the compensation area caused by the measurement, calculation method can be amended. The method has been applied to the determination of γ’p in weak magnetic field. The following error is less than 1 × 10 ~ (-7), while the uncertainty is better than 1 × 10 ~ (-6).