TA8008 flux meter with Helmholtz coil
In the closed loop composed of the measuring coil and the movable frame winding of the fluxmeter, when the magnetic flux Φ changes in the measuring coil, there is an induced current through the frame winding, prompting the frame to produce a certain skewness α, Φ and α are proportional, and the magnetic flux (Wb) is
Φ=(cα/N)×10-3 (1)
Where c is the fluxmeter impact coefficient, mWb/ cell, standard fluxmeter, c=1; N indicates the number of turns of the measurement coil. The magnetic flux is related to the product of the magnetic field strength H at the location and the average cross-sectional area S of the measuring coil, so the magnetic field strength
H=Φ/S = (cα/NS)×10-3 (2)
The magnetic flux is measured directly, and the magnetic field strength is calculated. The fluxmeter needs to be corrected before use to ensure the accuracy of the measurement.
Secondly, magnetic field lines are used to depict the magnetic field visually. The magnetic field lines of various magnetic fields generated by the current are shown in Figure (1.1). It can be seen that the magnetic field line is a headless and tailless closed line around the current, and the direction of current and the direction of rotation of the magnetic field line conform to the right-hand rule.