Zheng Dezhi, Liu Yixuan, Guo Zhanshe, Zhao Xiaomeng, Fan Shangchun
School of Instrument Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China.
Laser Medicine Laboratory, Institute of Biomedical Engineering, Chinese Academy of medical Sciences and Peking Union Medical College, Tianjin 300192, China.
Rev Sci Instrum. 2015 Oct;86(10):105001. doi: 10.1063/1.4931692.
A new maglev sensor is proposed to measure ultra-low frequency (ULF) vibration, which uses hybrid-magnet levitation structure with electromagnets and permanent magnets as the supporting component, rather than the conventional spring structure of magnetoelectric vibration sensor. Since the lower measurement limit needs to be reduced, the equivalent bearing stiffness coefficient and the equivalent damping coefficient are adjusted by the sensitivity unit structure of the sensor and the closed-loop control system, which realizes both the closed-loop control and the solving algorithms. A simple sensor experimental platform is then assembled based on a digital hardware system, and experimental results demonstrate that the lower measurement limit of the sensor is increased to 0.2 Hz under these experimental conditions, indicating promising results of the maglev sensor for ULF vibration measurements.
提出了一种用于测量超低频（ULF）振动的新型磁悬浮传感器，该传感器采用电磁体和永磁体的混合磁悬浮结构作为支撑部件，而非磁电式振动传感器的传统弹簧结构。由于需要降低下限测量值，通过传感器的敏感单元结构和闭环控制系统来调整等效支承刚度系数和等效阻尼系数，从而实现闭环控制和求解算法。然后基于数字硬件系统组装了一个简单的传感器实验平台，实验结果表明，在这些实验条件下，该传感器的下限测量值提高到了0.2Hz，这表明磁悬浮传感器在超低频振动测量方面具有良好的前景。
