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Magnetometers used in geophysical survey may use a single sensor to measure the total magnetic field strength, or may use two (sometimes more) spatially separated sensors to measure the gradient of the magnetic field (the difference between the sensors). In most archaeological applications the latter (gradiometer) configuration is preferred ...
The term typically refers to magnetometers used by military forces to detect submarines (a mass of ferromagnetic material creates a detectable disturbance in the magnetic field). Military MAD equipment is a descendant of geomagnetic survey or aeromagnetic survey instruments used to search for minerals by detecting their disturbance of the ...
An aeromagnetic survey is a common type of geophysical survey carried out using a magnetometer aboard or towed behind an aircraft. The principle is similar to a magnetic survey carried out with a hand-held magnetometer, but allows much larger areas of the Earth's surface to be covered quickly for regional reconnaissance.
Magnetometers used in geophysical survey may use a single sensor to measure the total magnetic field strength, or may use two (sometimes more) spatially separated sensors to measure the gradient of the magnetic field (the difference between the sensors).
This type of survey is carried out to discover the structure of rock formations beneath the surface of the Earth. Magnetic techniques , including aeromagnetic surveys and magnetometers . Electrical techniques , including electrical resistivity tomography , induced polarization , spontaneous potential and marine control source electromagnetic ...
It had a caesium vapor scalar magnetometer and a fluxgate vector magnetometer. [7] CHAMP , a German satellite, made precise gravity and magnetic measurements from 2001 to 2010. [ 8 ] [ 9 ] A Danish satellite, Ørsted , was launched in 1999 and is still in operation, while the Swarm mission of the European Space Agency involves a "constellation ...
A proton magnetometer, also known as a proton precession magnetometer (PPM), uses the principle of Earth's field nuclear magnetic resonance (EFNMR) to measure very small variations in the Earth's magnetic field, allowing ferrous objects on land and at sea to be detected.
Survey magnetograph, a survey magnetometer that continuously records the time-variation in the geomagnetic field Topics referred to by the same term This disambiguation page lists articles associated with the title Magnetograph .