• Categories:Industry News
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• Time of issue:2020-12-28 15:04
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(Summary description)The Helmholtz coil is a device that generates a uniform magnetic field in a small area. Due to the openness of the Helmholtz coil, other instruments can be easily inserted or removed, and visual observation can also be performed directly. Therefore, it is a frequently used device in physics experiments. It consists of two completely equal parallel coils, the distance between the two coils is equal to the radius of the coil, and the signals of the two coils are connected in series. The radius of the coil should be selected to be at least 2.5 times the largest sample to be tested. This limitation can make all the samples in the uniform area of ​​the coil. When measuring, pay attention to the electromagnetic interference in the distance.

Double coil (Helmholtz coil) The frame and support system of the coil must be non-metallic, and the radius of the coil should be at least 2.5 times the largest sample to be tested. This restriction allows all samples to be in a unified volume area. The number of coil turns is usually 100 turns or more. Helmholtz coils are usually used to generate small uniform magnetic fields. This concept can be used in turn to measure the magnetic flux of open-circuit samples. During the measurement, please stay away from areas with magnetic field interference, such as other magnets, transformers or fluorescent sources.

When measuring small magnets, the measurement of the same Hall probe (Teslameter) becomes more and more unreliable, because the distance between the magnet surface and the probe has a great influence, and the distance between the probe and the sample surface must be accurate delete. The Helmholtz coil solves this problem by directly transmitting the signals of two coils connected in series to a digital flux meter. When measuring, place the magnet in the center of the coil (uniform area), adjust the zero point of the magnetic flux meter, and then move the magnet out of the coil to make it parallel to the coil axis. The distance is usually 75cm-100cm, so the sample has no effect on the reading.