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Helmholtz Coils
The Helmholtz coil system concept, developed by a German physicist over a century ago, is a system that is normally used to generate magnetic field levels of specified volume and uniformity, allowing scientists and engineers to perform numerous experiments and test functions that require a known ambient magnetic field. Helmholtz field generation can be static, time-varying DC or AC, depending on applications.
Applications range from cancelling the earth's magnetic field for certain experiments as well as generating magnetic fields for applications such as determining magnetic shielding effectiveness, determining the susceptibility of electronic equipment to magnetic fields, calibration of magnetometers and navigational equipment and for many bio-magnetic studies, just to name a few.
Helmholtz coils can also be used to sense magnetic fields when coupled with an integrating fluxmeter. This becomes a convenient way to determine the open circuit intrinsic characteristics of permanent magnet materials.
Accessory equipment such as Walker gaussmeters and magnetometers are available for magnetic field verification or incorporated as part of a closed loop system. Walker fluxmeters are also widely used in the Helmholtz/fluxmeter magnet measurement systems.
Applications
* Radiated Magnetic Field Immunity Testing
* Susceptibility measurements
* Calibration for navigational equipment
* Permanent magnet inspection
* Earth's field cancellation for bio-magnetic studies, etc.
* Magnetometer calibration
* Magnetoresistance measurement
* Hall probe calibration
* CRT adjustments
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