Introduction and application of Helmholtz coil

Helmholtz coil definition

If there are a pair of identical, parallel and coaxial current-carrying circular coils, and the current flows in the same direction, then the total magnetic field coils of the two carriers are uniform over a large area near the midpoint of the axis when the coil spacing is equal to the coil radius. Therefore, it has great practical value in production and scientific research, and is often used as the measurement standard of weak magnetic field. This pair of coils is called Helmholtz coils. Named after the German physicist Hermann von Helmholtz.
A typical single-axis Helmholtz coil consists of two coils with the same number of turns, the same winding method and a radius equal to the pitch of the coil. The Helmholtz coil can generate a static DC or AC magnetic field depending on the application. Helmholtz coils are commonly used to generate magnetic fields with relatively large specified volumes and high uniformity but relatively weak field values.

The magnetic field of a Helmholtz coil

Helmholtz coils are a pair of identical circular coils parallel to each other. The distance between the two coils is equal to the coil radius, and the winding method is such that the current flowing through the two coils is in the same direction. This winding method produces a uniform magnetic field between the two coils, the main component of which is parallel to the axes of the two coils.
The uniform region of the Helmholtz coil is large, wide and easy to operate. It can realize one -, two - and three - dimensional combined magnetic fields, and can provide AC and DC magnetic fields. There is a good linear relationship between electric current and magnetic field.

Helmholtz coil applications

Applicable to various scientific research institutes, universities and enterprises to conduct magnetic materials or test experiments, suitable for materials, electronics, biology, medicine, aerospace, chemistry, applied physics and other disciplines. Its main purpose: to generate a standard magnetic field; Offsetting and compensation, geomagnetic environment simulation, magnetic shielding effect determination, electromagnetic interference simulation experiment, Hall probe and various magnetometers calibration, biological magnetic field research and magnetic properties of materials.
Applications of Helmholtz coils include eliminating the Earth's magnetic field, generating magnetic fields for experimental purposes, and applications requiring such magnetic fields. Depending on the field of application, the generated Helmholtz magnetic field may be static, time-varying DC or AC.