Huang Xiangqing, Deng Zhongguang, Xie Yafei, Li Zhu, Fan Ji, Tu Liangcheng
MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
School of Physics and Astronomy, Sun Yat-sen University, Guangzhou 510275, China.
Sensors (Basel). 2017 Oct 27;17(11):2471. doi: 10.3390/s17112471.
A new and simple method to adjust the scale factor of a magnetic force feedback accelerometer is presented, which could be used in developing a rotating accelerometer gravity gradient instrument (GGI). Adjusting and matching the acceleration-to-current transfer function of the four accelerometers automatically is one of the basic and necessary technologies for rejecting the common mode accelerations in the development of GGI. In order to adjust the scale factor of the magnetic force rebalance accelerometer, an external current is injected and combined with the normal feedback current; they are then applied together to the torque coil of the magnetic actuator. The injected current could be varied proportionally according to the external adjustment needs, and the change in the acceleration-to-current transfer function then realized dynamically. The new adjustment method has the advantages of no extra assembly and ease of operation. Changes in the scale factors range from 33% smaller to 100% larger are verified experimentally by adjusting the different external coefficients. The static noise of the used accelerometer is compared under conditions with and without the injecting current, and the experimental results find no change at the current noise level, which further confirms the validity of the presented method.
提出了一种用于调整磁力反馈加速度计比例因子的新的简单方法，该方法可用于开发旋转加速度计重力梯度仪（GGI）。自动调整和匹配四个加速度计的加速度-电流传递函数是GGI开发中抑制共模加速度的基本且必要的技术之一。为了调整磁力再平衡加速度计的比例因子，注入外部电流并将其与正常反馈电流相结合；然后将它们一起施加到磁致动器的扭矩线圈上。注入电流可根据外部调整需求成比例变化，从而动态实现加速度-电流传递函数的变化。新的调整方法具有无需额外组装且操作简便的优点。通过调整不同的外部系数，实验验证了比例因子变化范围从小33%到大一倍的情况。在有和没有注入电流的条件下比较了所用加速度计的静态噪声，实验结果发现在当前噪声水平下没有变化，这进一步证实了所提方法的有效性。
