For full-maglev vertical superconducting gravity instruments, displacement control in the non-sensitive axis is a key technique to suppress cross-coupling noise in a dynamic environment. Motion decoupling of the test mass is crucial for the control design. In practice, when levitated, the test mass is always in tilt, and unknown parameters will be introduced to the scale factors of displacement detection, which makes motion decoupling work extremely difficult. This paper proposes a method for decoupling the translation and rotation of the test mass in the non-sensitive axis for full-maglev vertical superconducting gravity instruments. In the method, superconducting circuits at low temperature and adjustable gain amplifiers at room temperature are combined to measure the difference between the scale factors caused by the tilt of the test mass. With the measured difference of the scale factors, the translation and rotation are decoupled according to the theoretical model. This method was verified with a test of a home-made full-maglev vertical superconducting accelerometer in which the translation and rotation were decoupled.

中文翻译：

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全磁悬浮垂直超导重力仪中测试质量平移和旋转解耦的方法

对于全磁悬浮垂直超导重力仪器，非敏感轴的位移控制是抑制动态环境中交叉耦合噪声的关键技术。测试质量的运动解耦对于控制设计至关重要。实际上，当悬浮时，测试质量始终处于倾斜状态，未知参数将被引入位移检测的比例因子，这使得运动解耦工作极为困难。本文提出了一种用于全磁悬浮垂直超导重力仪器在非敏感轴上解耦测试质量和平移和旋转的方法。在该方法中，将低温下的超导电路和室温下的可调增益放大器进行组合，以测量由测试质量的倾斜引起的比例因子之间的差异。利用所测量的比例因子的差异，根据理论模型将平移和旋转解耦。通过自制的全磁悬浮垂直超导加速度计的测试验证了该方法的有效性，在该加速度计中，平移和旋转解耦。