Seismic instruments: article

A new design version of vertical gravitational gradiometer
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences
Journal: Seismic instruments
Tome: 56
Number: 3
Year: 2020
Pages: 26-34
UDK: 528.568
DOI: 10.21455/si2020.3-2
Аnnotation file
Bibliographic list
Keywords: gravitational gradient, float, test mass, Archimedean force, coefficient of thermal expansion, compressibility coefficient
Аnnotation: The article considers a new version of the construction of a vertical gravitational gradiometer. The main idea is to use the height-separated test mass and float, rigidly connected to each other and placed in the liquid, and the weight of the system is balanced by the Archimedean force. Changing the gravitational gradient results in a small movement of the system, which is connected to the body by a soft spring. When measured by a sensor, this movement contains information about the gradient value. In despite of the external simplicity of the idea, its implementation is quite difficult due to the influence of temperature variations. We discuss four options for creating the device, which showed the fundamental possibility of implementing a measuring device with a resolution of hundredths - tenths of an etwesh.