Related topics: magnetic field

Quantum magnetometers for industrial applications

On April 1 2019, the Fraunhofer-Gesellschaft launches the lighthouse project "Quantum Magnetometry" (QMag): Freiburg's Fraunhofer institutes IAF, IPM and IWM want to transfer quantum magentometry from the field of university ...

Image: Magnetometer boom built for ESA's mission to Jupiter

A test version of the 10.5-m long magnetometer boom built for ESA's mission to Jupiter, developed by SENER in Spain, seen being tested at ESA's Test Centre in the Netherlands, its weight borne by balloons.

Image: BepiColombo magnetometer boom deployed

The 2.5 m long boom carrying the magnetometer sensors onboard ESA's BepiColombo Mercury Planetary Orbiter (MPO) has been successfully deployed. The sensors are now prepared to measure the magnetic field on the way to Mercury.

Minutest absolute magnetic field measurement

Every measurement is potentially prone to systematic error. The more sensitive the measurement method, the more important it is to make sure it is also accurate. This is key for example in measuring magnetic fields in state-of-the-art ...

CubeSat instruments to demonstrate NASA firsts

The Dellingr six-unit CubeSat, which is taking its developers just one year to design, build and integrate, won't be the only potentially groundbreaking capability for NASA. Its heliophysics payloads also are expected to ...

Researchers develop a simple but extremely sensitive magnetometer

VTT Technical Research Centre of Finland has developed an innovative magnetometer that can replace conventional technology in applications such as neuroimaging, mineral exploration and molecular diagnostics. Its manufacturing ...

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A magnetometer is a measuring instrument used to measure the strength or direction of a magnetic field either produced in the laboratory or existing in nature. Some countries such as the USA, Canada and Australia classify the more sensitive magnetometers as military technology, and control their distribution.

The International System of Units unit of measure for the strength of a magnetic field is the tesla. As this is a very large unit, workers in the earth sciences commonly use the nanotesla (nT) as their working unit of measure. Engineers often measure magnetic fields in Gauss. 1 Gauss = 100,000 nT or 1 Gauss = 100,000 gamma.

The Earth's magnetic field (the magnetosphere) is a potential field. It varies both temporally and spatially for various reasons, including inhomogeneity of rocks and interaction between charged particles from the Sun and the magnetosphere.

The earth's magnetic field is relatively weak. A simple magnet that may be purchased in a hardware store produces a field many hundreds of times stronger than the earth's field. The earth's magnetic field varies from around 20,000 nT near the equator to 80,000 nT near the poles. It also varies with time. There is a daily variation of around 30 nT at mid latitudes and hundreds of nT at the poles. Geomagnetic storms can cause much larger variations.

Magnetometers, which measure magnetic fields, are distinct from metal detectors, which detect hidden metals by their conductivity. When used for detecting metals, a magnetometer can detect only magnetic (ferrous) metals, but can detect such metals buried much deeper than a metal detector. Magnetometers are capable of detecting large objects like cars at tens of meters, while a metal detector's range is unlikely to exceed 2 meters.

This text uses material from Wikipedia, licensed under CC BY-SA