Prasad Abhinav, Middlemiss Richard P, Noack Andreas, Anastasiou Kristian, Bramsiepe Steven G, Toland Karl, Utting Phoebe R, Paul Douglas J, Hammond Giles D
School of Physics and Astronomy, University of Glasgow, Kelvin Building, University Avenue, Glasgow, G12 8QQ, UK.
James Watt School of Engineering, University of Glasgow, Rankine Building, Oakfield Avenue, Glasgow, G12 8LT, UK.
Sci Rep. 2022 Jul 29;12(1):13091. doi: 10.1038/s41598-022-16881-1.
The measurement of tiny variations in local gravity enables the observation of subterranean features. Gravimeters have historically been extremely expensive instruments, but usable gravity measurements have recently been conducted using MEMS (microelectromechanical systems) sensors. Such sensors are cheap to produce, since they rely on the same fabrication techniques used to produce mobile phone accelerometers. A significant challenge in the development of MEMS gravimeters is maintaining stability over long time periods, which is essential for long term monitoring applications. A standard way to demonstrate gravimeter stability and sensitivity is to measure the periodic elastic distortion of the Earth due to tidal forces-the Earth tides. Here, a 19 day measurement of the Earth tides, with a correlation coefficient to the theoretical signal of 0.975, has been presented. This result demonstrates that this MEMS gravimeter is capable of conducting long-term time-lapse gravimetry, a functionality essential for applications such as volcanology.
对局部重力微小变化的测量能够实现对地下特征的观测。重力仪在历史上一直是极其昂贵的仪器，但最近已开始使用微机电系统（MEMS）传感器进行可用的重力测量。这类传感器生产成本低廉，因为它们采用了与制造手机加速度计相同的制造技术。MEMS重力仪开发过程中的一个重大挑战是要在很长一段时间内保持稳定性，这对于长期监测应用至关重要。证明重力仪稳定性和灵敏度的一种标准方法是测量由于潮汐力——地球潮汐——导致的地球周期性弹性变形。在此，展示了对地球潮汐进行的为期19天的测量，与理论信号的相关系数为0.975。这一结果表明，这种MEMS重力仪能够进行长期的延时重力测量，这是火山学等应用所必需的一项功能。
