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Magnetic particle inspection A technician performs MPI on a pipeline to check for stress corrosion cracking using what is known as the "black on white" method. No indications of cracking appear in this picture; the only marks are the "footprints" of the magnetic yoke and drip marks.
The VSM relies on Faraday's law of induction, with the detection of the emf given by , [7] where N is the number of wire turns, A is the area, and the angle between the normal of the coil and the B field. However, N and A are often unnecessary if the VSM is properly calibrated. [7] By varying the strength of the electromagnet through computer software, the external field is sweeped from high ...
Magnetic Flux Leakage Principle [1] Magnetic flux leakage (TFI or Transverse Field Inspection technology) is a magnetic method of nondestructive testing to detect corrosion and pitting in steel structures, for instance: pipelines and storage tanks. The basic principle is that the magnetic field "leaks" from the steel at areas where there is corrosion or missing metal. To magnetize the steel, a ...
Helium vector magnetometer (HVM) of the Pioneer 10 and 11 spacecraft A magnetometer is a device that measures magnetic field or magnetic dipole moment. Different types of magnetometers measure the direction, strength, or relative change of a magnetic field at a particular location. A compass is one such device, one that measures the direction of an ambient magnetic field, in this case, the ...
This is a specific example of a general rule that magnets are attracted (or repulsed depending on the orientation of the magnet) into regions of higher magnetic field. Any non-uniform magnetic field, whether caused by permanent magnets or electric currents, exerts a force on a small magnet in this way.
Magnetic separation is the process of separating components of mixtures by using a magnet to attract magnetic substances. [1] The process that is used for magnetic separation separates non-magnetic substances from those which are magnetic.
The most elementary force between magnets is the magnetic dipole–dipole interaction. If all magnetic dipoles for each magnet are known then the net force on both magnets can be determined by summing all the interactions between the dipoles of the first magnet and the dipoles of the second magnet.
MRI is a medical application of nuclear magnetic resonance (NMR) which can also be used for imaging in other NMR applications, such as NMR spectroscopy. 1 MRI is widely used in hospitals and clinics for medical diagnosis, staging and follow-up of disease.