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hot products

  • Hall Effect Measurement System

    DX-100 Hall Effect Measurement System

  • soft magnetic material coercivity measuring device

    DX-2012HC soft magnetic material coercivity measuring device

  • Fluxgate Magnetometer

    DX-330F 3D Fluxgate Magnetometer

  • Gauss Meter

    DX-105 Gauss Meter

  • Double-Yoke Double-Tuning Adjustable Air Gap Electromagnet

    DXSB Double-Yoke Double-Tuning Adjustable Air Gap Electromagnet

  • 3 Axis Helmholtz Coils

    3 Axis Helmholtz Coils

Helmholtz coil magnetic field measurement experiment

        Helmholtz coils are two identical coils, parallel and coaxial to each other, the distance between the coils equal to the coil radius R. When the two coils are connected by current I in the same direction, the uniform magnetic field is generated in a large range on the coil axis (the line between the center of the two coils), and such coils are called Helmholtz coils.

一、The magnetic field of the current carrying circular coil
(a) shows the distribution of magnetic field intensity on the axis of a single liux-carrying coil; (b) shows the distribution of magnetic field intensity on the axis of two coaxial coils of the same coil.

二、Hall-effect sensor

  The experiment requires high magnetic field measurement. Here Hall effect method is used to measure the magnetic field.
When the conductor with current I is placed in a magnetic field, an additional potential difference Eh will be generated in the direction perpendicular to current I and magnetic field B. This phenomenon was first discovered by Hall in 1879, so it is called Hall effect. The potential difference uH is called the Hall voltage.
        As shown in the figure, under the action of Lorentz force F, the electrons of the conductor in the Hall effect deflected to the B side, which is located in the negative direction of the Y axis as indicated by the dotted arrow in the figure, and caused the accumulation of electrons on the B side and the accumulation of positive charges on the opposite side. At the same time, the moving electrons are also subjected to an opposing electric field force, f E, which is caused by the two accumulated dissimilar charges. With the increase of charge accumulation, f E increases. When the two forces are equal in magnitude (opposite in direction), f =-f E, then the accumulation of electrons will reach dynamic equilibrium.

Let's say the velocity of charge is V, F = bqV, so F =-f E
Bqv=Uq/l
U=Blv
Hall element current I= NQVLD
U = the IB/NQD - - - (a)
Hall coefficient Rh =1/ Nq
The magnitude of magnetic field B can be calculated from Equation (1) above.


三、experimental instrument

1. Milotesla meter
2. The ammeter
3. DC current source
4. Current regulating knob
5. Zero knob
6. Sensor plug
7. The fixed frame
8. Hall sensor


四、

  • Demonstrator


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