Gradiometer - Wikipedia
A gradiometer measures the gradient (numerical rate of change) of a physical quantity, such as a magnetic field or gravity. [1] There are at least two types of gradiometer to measure magnetic fields: Axial gradiometer. This device consists of two magnetometers placed in series (i.e., one above the other).
Gravity gradiometry - Wikipedia
Gravity gradiometry is the study of variations (anomalies) in the Earth's gravity field via measurements of the spatial gradient of gravitational acceleration.
gravity gradiometer (SGG) has extremely stable scale factors due to the increased mechanical stability of materials at low temperatures and the ultrahigh stability of persistent currents [Chan and Paik, 1987; Chan, Moody, and Paik, 1987; Moody, Canavan, and Paik, 2002].
Gradiometers have shown that they can offer a high degree of immunity from diurnal and minor magnetic storm activity in the ambient magnetic field; they can enhance near-surface, small or weakly magnetic anomalies; and they can provide obvious improvements in spatial resolution over the total field measurement alone.
A gravity gradiometer is an instrument that measures the spatial rate of change of the components of the gravity field. In contrast to a gravimeter, which measures the strength of the gravity field, a gradiometer is more sen sitive to the high-frequency spatial variations in the field.
Gravity Gradiometers - an overview | ScienceDirect Topics
Gravity gradiometers are devices that measure all the independent tensor components of the gravity gradient field from a moving platform, allowing for accurate data acquisition to improve mineral and hydrocarbon exploration results. You might find these chapters and articles relevant to this topic. Orlando Alvarez, ...
In particular, space-borne gradiometers were proposed for gravitational mapping of planets and moons. critical for partial tensor gradiometers and FTGs that are not true full tensor gradiometers. They are modulated at twice the rotation rate, Ω, of the sensor disk. Airborne Gradiometry - BHP FalconTM (Fugro ... ...
Gravity gradiometry - Book chapter - IOPscience
In this chapter, a 'small world' of gravity gradiometery is presented. It starts from the history, goes through the latest developments and finishes at its strategic applications such as oil, gas and mineral exploration, defence and many more.
Two Paths to a Magnetic Gradiometer - Physics
2022年11月23日 · At the heart of an optically pumped atomic magnetometer lies a gas of alkali atoms whose spins are aligned by a circularly polarized laser—the optical pump.
Gravity, Gradiometry | SpringerLink
2021年1月1日 · Gravity gradiometry has a long and varied history of static (ground-based), shipborne, airborne, and spaceborne measurement systems. This entry includes the mathematical foundations and properties of gradients starting with Newton’s law of gravitation.