测量地球的潮与一个二磁微振荡器在室温
Yingchun Leng1, Yiming Chen1, Rui Li2,3,4
1National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.
Physical review letters
|April 5, 2024
概括
我们开发了一种使用二磁悬浮的微型重力计,在室温下达到高精度. 这个紧的设备为地球重力测量和潜在的移动应用提供了显著的改进.
科学领域:
- 地质物理学 地质物理学
- 传感器技术 传感器技术
- 材料科学 材料科学 材料科学
背景情况:
- 精确测量地球的重力对于基础研究和应用至关重要.
- 高精度重力计的小型化仍然是一个重大的技术挑战.
研究的目的:
- 提出并演示在室温下运行的小型重力计.
- 为了克服现有的微电子机械系统 (MEMS) 引力计的局限性.
主要方法:
- 使用了一种二磁悬浮式微振荡器,其证明质量为215毫克.
- 在室温下运行重量计,以提高可访问性.
主要成果:
- 实现了15μGal/√Hz的加速度灵敏度.
- 显示低漂移率为每天61μGal.
- 观测到的地球潮与理论数据的相关系数为0.97.
结论:
- 在二磁悬浮重力测量显示了相对于现有的MEMS设备的显著性能改进.
- 未来的发展可能会导致芯片大小的设备适合移动平台,如无人机.
- 这项技术在地下密度测量和自然灾害预测方面具有潜在的应用.
相关概念视频
01:17Magnetic Damping
454
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
454
01:11Atomic Nuclei: Larmor Precession Frequency
1.3K
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
1.3K