Helmholtz coils

Helmholtz coils

A pair of flat circular coils with equal numbers of turns and equal diameters, arranged with a common axis, and connected in series to have a common current (see illustration). The purpose of the arrangement is to obtain a magnetic field that is more nearly uniform than that of a single coil without the use of a long solenoid. The optimum arrangement is that in which the distance between the two coils is equal to the radius of one of the coils.

Helmholtz coils separated by distance r , resulting in a nearly uniform field of point P enlarge picture
Helmholtz coils separated by distance r, resulting in a nearly uniform field of point P

Helmholtz coils

[′helm‚hōlts ‚kȯilz]
(electromagnetism)
A pair of flat, circular coils having equal numbers of turns and equal diameters, arranged with a common axis, and connected in series; used to obtain a magnetic field more nearly uniform than that of a single coil.
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References in periodicals archive ?
In particular, with six coils type magnetometer three Helmholtz coils may be used, located in the center of the magnetic field shielding region [10] or six magnetometers disposed in respective planes and orthogonally oriented with respect to the control windings.
ANSI/IEEE standard [6], [7] defines two magnetic sensor calibration methods: single-layer square loop and round Helmholtz coils.
To that end a round Helmholtz coil with rather high diameter (55.
At low frequencies, large Helmholtz coils driven by power amplifiers are used to establish a uniform field.
According to the user manual for the ETS-Lindgren Model 6400 Series Helmholtz Coils, "Precision in the manufacture of the 12 ft to 8 ft dial coils and their support assembly is well within a design tolerance of 0.
Key words: Helmholtz coils, uniform magnetic field, COMSOL simulation, magnetic measurements
Helmholtz coils in one axis are consisted from two identical coils with defined radius R.
Kilaneh first computed and verified the magnetic field distribution caused by Helmholtz coils through numerical methods.
2 cm), a stop-watch timer, a thin string, a DC low voltage source, a set of Helmholtz coils of radius of 14.
The system comprises a dedicated controller with automated calibration and self-test features, an AC and DC magnetic sensor, and Helmholtz coils in a structural casing.
Dual coil magnet consists of two identical separate coils positioned axially as Helmholtz coils to insure maximal homogeneity of magnetic field in central area.
Orthogonal Helmholtz coils provide the magnetic bias and saturating fields required for the measurement.