Wang Lulu, Chen Daiyong, Liu Xikai, Chen Liang, Liu Xiangdong
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.
Sensors (Basel). 2020 Sep 27;20(19):5527. doi: 10.3390/s20195527.
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.
对于全磁悬浮垂直超导重力仪而言，在非敏感轴上进行位移控制是抑制动态环境中交叉耦合噪声的一项关键技术。测试质量块的运动解耦对于控制设计至关重要。在实际应用中，当测试质量块悬浮时，它总是处于倾斜状态，这会给位移检测的比例因子引入未知参数，使得运动解耦工作极具难度。本文提出了一种针对全磁悬浮垂直超导重力仪在非敏感轴上对测试质量块的平移和旋转进行解耦的方法。该方法将低温超导电路与室温可调增益放大器相结合，以测量由测试质量块倾斜引起的比例因子之间的差异。利用所测得的比例因子差异，根据理论模型对平移和旋转进行解耦。通过对自制的全磁悬浮垂直加速度计进行测试，验证了该方法能够实现平移和旋转的解耦。
