Helmholtz coils fluxmeter
Fluxmeter instrumentation with Helmholtz coils.
A very common use of the fluxmeter is for quality control. Using proper measuring system it’s possible to determine the absolute properties of a given material using flux values. In many cases, however, it is sufficient to have comparative data. For example, to select a large number of magnets based on their residual induction, it is not necessary to measure and calculate each magnet Br, using Helmholtz coils, for example, but it is sufficient to know the flux value corresponding to acceptable minimum and maximum values and make a selection with these values.
The most common case is when the measuring system is directly introduced into the magnetisation coil. After magnetisation, removing the part from the coil a flux variation occurs and the fluxmeter reads it. The quality of a given magnet is therefore immediately checked.
Various models of data collecting and data processing of data coming from the fluxmeter are available.
The software in use friendly and general is the STATI-200, produced by Laboratorio Elettrofisico, which allows on line and real time statistic control of magnetised parts. The fluxmeter, connected with the coil, measures a magnetic flux. The values of flux are sent, automatically or manually, to the PC, where the acquisition program elaborates statistically the data.