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Active magnetic compensation systems DC 1 kHz

Magnetic field strength DC till 1 kHz can be reduced by creating a contra-field, so that the total strength of the field is nearly zero.

Active magnetic compensation systems DC 1 kHz

Background

Research methods used in medicine e.g electron microscopy and magnetic resource imaging (MRI) have improved a lot recently when it comes to the resolution used. At the same time, this also means that they have become more sensitive to ambient conditions. This is especially a problem when it comes to the effects of magnetic fields, temperature, vibrations and sound waves.

Principle

Magnetic fields are vector fields. It is possible to superimpose an interference field vector by a field of equal magnitude, provided the fields have opposite directions. In theory, this would lead to the eradication of the interference field. In practice, the field will not be completely eradicated, only the field strength will be reduced significantly.
To accomplish this, the prevailing magnetic field is measured with a probe. An arrangement of current-carrying coils generates a matching oposite field. If there are any fluctuations in the interference field, a control unit makes sure the flow is adjusted. Especially when the field changes, the active compensation system will be a superior way to get optimal reduction.
Magnetic field strength DC till 1 kHz can be reduced by creating a contra-field, so that the total strength of the field is nearly zero.

Implementation.

To compensate magnetic interference fields regardless of the waveform, a field reduction with the widest possible frequency range is required. A specially designed sensor can achieve this.

This is used for areas where it is difficult to implement regular shielding, or when the active shielding is combined with a magnetic Faraday cage.


Applications:

  • Medicine, Magnetic Resonance Imaging (MRI)
  • Research, Electron microscopy
  • Near transformers
  • Work areas where levels are above the limit
 

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