Measuring the Strength and Direction of the Magnetic Fields with the Magnetometer

We all know that the magnetic fields are generated by magnets, and they are eventually used to produce electric power. Would you believe, if you were told that human organs can also generate some magnetic fields?

Yes, our heart and mind can produce some magnetic fields. Here, in this post a few of the magnetic fields which are produced by the magnets and human organs have been differentiated. We will also have a look how to calculate magnetic flux.


Magnetic fields in regular life

These take a huge space in our regular life. Most of the electrical items produce some of these fields, for example Televisions, computers, power transmission lines, etc. Our earth is surrounded by its own magnetic field. It is directly proportional to 1/r3 (At normal solar wind flow).

The highest potential of the magnetic field is at the poles (approximately 60,000 nT and the lowest potential at the equator (approximately 30,000 nT). To measure this specific sensing device is used, which is called Magnetometer.

How the magnetometer works?

It is a scientific device, which is used to calculate the strength and direction of the magnetic fields. Carl Friedrich Gauss invented the first magnetometer in 1833. A magnetometer has a sensor to measure the magnetic flux B in the units of Tesla or As/ m2. This device refers to a sensor or a system, which is connected with one or more sensors.

Magnetometer will be able to measure the fluctuations in the earth’s layers, till the magnetic field strength is directly proportional to the magnetic flux density in the air. Magnetic flux can be distorted by a few materials called magnets. These kinds of materials might have very high magnetic flux and conductivity.

A magnetomeeter can figure out the distortion in the earth’s magnetic flux caused by these materials. These fluxes are measured by a magnetometer at any point in the space. The intensity of the magnetic field drops with a cube distance from the object. Here, the maximum distance can be detected by the given this device is directly proportional to the cube root of the sensitivity of the magnetometer. Tesla is the unit to measure the sensitivity of a magnetometer.

Classifications of magnetometers

These devices are available in two types. The first type is vector magnetometer and the second type is scalar magnetometer.

  • Flux density in a specific direction in three-dimensional space can be measured by the vector magnetometers. Fluxgate measuring devices are the best example for the vector magnetometers.
  • Scalar magnetometers are used to measure the magnitude of the vector passing through the sensor irrespective to the direction. Quantum measuring devices are the best example for the scalar magnetometers.

These measuring devices are mostly used in geophysical surveys, magnetotellurics and magnetic surveys. It is also used to detect the archaeological sited, shipwrecks and buried or submerged objects, metal detectors like the device used to find the guns and knives and to detect the submarines in defence. Not just that, many of the building contractors use it to detect metal in while laying foundation of a home or commercial premises.

Author’s Bio:

Marian Rosen is an experienced engineer, and She also blogs on topics related to home and real estate. After reading this post, if you need more info on Magnetomeeter, please visit their website,

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