Search results
Results from the WOW.Com Content Network
The first magnetometer capable of measuring the absolute magnetic intensity at a point in space was invented by Carl Friedrich Gauss in 1833 and notable developments in the 19th century included the Hall effect, which is still widely used. Magnetometers are widely used for measuring the Earth's magnetic field, in geophysical surveys, to detect ...
For comparison, a typical refrigerator magnet produces 0.01 tesla (10 −2 T), and some processes in animals produce very small magnetic fields between 10 −9 T and 10 −6 T. SERF atomic magnetometers, invented in the early 2000s are potentially more sensitive and do not require cryogenic refrigeration but are orders of magnitude larger in ...
It can also be used to correct for the roll- and heel-induced errors that often plague fluxgate compasses installed on steel vessels. The fluxgate magnetometer was invented by German physicist Friedrich Förster in 1937, [2] the fluxgate compass was invented by the Eclipse-Pioneer Division of Bendix in 1943. [3]
A magnetometer gives serious evidence that the Alligator Jr., a prototype craft that led to the U.S. submarine fleet, may have been found.
The most accurate magnetometer complexes on spacecraft contain two separate instruments, with a helium ionized gas magnetometer used to calibrate the fluxgate instrument for more accurate readings. Many later magnetometers contain small ring-coils oriented at 90° in two dimensions relative to each other forming a triaxial framework for ...
A magnetic anomaly detector (MAD) is an instrument used to detect minute variations in the Earth's magnetic field. [1] 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 ).
Surface-towed magnetometers allow for a wider range of detection but have lower precision than near-bottom magnetometers. [6] The most common type of magnetometer used for marine surveying is the fluxgate magnetometer. Fluxgate magnetometers utilize two ferromagnetic cores each wound with a primary coil (in opposite directions) and an outer ...
In 1958 Glenn A. Black and Eli Lilly, following the work of Martin Aitken and his associates at the Oxford University (UK) Archaeometric Laboratory, used proton magnetometers to locate and map buried archaeological features, including iron objects in the soil, thermoremanent magnetization of fired clays, and differences in the magnetic susceptibility of disturbed soils.