Leng Yingchun, Chen Yiming, Li Rui, Wang Lihua, Wang Hao, Wang Lei, Xie Han, Duan Chang-Kui, Huang Pu, Du Jiangfeng
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.
CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China.
Phys Rev Lett. 2024 Mar 22;132(12):123601. doi: 10.1103/PhysRevLett.132.123601.
The precise measurement of the gravity of Earth plays a pivotal role in various fundamental research and application fields. Although a few gravimeters have been reported to achieve this goal, miniaturization of high-precision gravimetry remains a challenge. In this work, we have proposed and demonstrated a miniaturized gravimetry operating at room temperature based on a diamagnetic levitated micro-oscillator with a proof mass of only 215 mg. Compared with the latest reported miniaturized gravimeters based on microelectromechanical systems, the performance of our gravimetry has substantial improvements in that an acceleration sensitivity of 15 μGal/sqrt[Hz] and a drift as low as 61 μGal per day have been reached. Based on this diamagnetic levitation gravimetry, we observed Earth tides, and the correlation coefficient between the experimental data and theoretical data reached 0.97. Some moderate foreseeable improvements can develop this diamagnetic levitation gravimetry into a chip size device, making it suitable for mobile platforms such as drones. Our advancement in gravimetry is expected to facilitate a multitude of applications, including underground density surveying and the forecasting of natural hazards.
地球引力的精确测量在各个基础研究和应用领域都起着关键作用。尽管已有少数重力仪被报道能够实现这一目标，但高精度重力测量的小型化仍然是一个挑战。在这项工作中，我们提出并展示了一种基于抗磁悬浮微振荡器的室温小型化重力测量方法，其检验质量仅为215毫克。与最新报道的基于微机电系统的小型化重力仪相比，我们的重力测量性能有了显著提升，达到了15 μGal/√Hz的加速度灵敏度和每天低至61 μGal的漂移。基于这种抗磁悬浮重力测量，我们观测到了地球潮汐，实验数据与理论数据之间的相关系数达到了0.97。一些适度的可预见改进可以将这种抗磁悬浮重力测量发展成芯片尺寸的设备，使其适用于无人机等移动平台。我们在重力测量方面的进展有望推动众多应用，包括地下密度测量和自然灾害预测。
