Helmholtz Coils are a special arrangement of coils such that when an electric current is applied to them, the resultant magnetic field generated between the coils is extremely uniform. Coils configured in this way are also used for applying or measuring fields and are useful for experiments and calibration where a known ambient magnetic field is required.
This arrangement of coils was invented by the German physicist, Hermann von Helmholtz, over a century ago.
Multi axis systems allow the precise control of magnetic field in three dimensions.
Helmholtz field generation is produced using either AC or DC current.
i) Measurement, such as permanent magnet moment measurement.
ii) Removing or nulling backgroung magnetic fields, such as nulling the earths magnetic field to generate a low field environment.
iii) Apply a uniform magnetic field as in experimental physics
or TV production picture alignment proceedures.
Hirst Magnetic Instruments design and manufacture a number of arrangements including a Helmholtz Chamber or Cube described in more depth go to "Next" below.
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