Goudsmit HGM09S, Руководство по эксплуатации

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Gaussmeter HGM09s Operating Instructions
Chapter 3 Gaussmeter Function
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Figure 4 Field Strength Pattern of NdFeB Induction Disk
The diagram in Figure 4 represents the measurement with a Hall probe which is moved
in parallel to the surface of the magnet with a distance of 1mm distance to the measur-
ing surface.
A minimum of the flux density emerges in the center of the magnet. Here approx.
230mT are measured. Due to the locally changing working points on the radius of the
magnet, the flux density increases toward the outside. In the center the magnet carries
the highest magnetic load in air and therefore provides the lowest flux density.
3.2.2 3.2.2 3.2.2 3.2.2 Remanence and Hall Gaussmeter Measurement Remanence and Hall Gaussmeter Measurement Remanence and Hall Gaussmeter Measurement Remanence and Hall Gaussmeter Measurement
The remanence
B
r
is a measure for the aligned magnetic dipoles in the center of the
magnet. B
r
is the theoretically maximal flux density that can be achieved if the magnet is
in magnetic idle. If it works against a magnetic resistance, it is always
B
<
B
r
.
On the surface of an individual magnet B < B
r
/2 applies even more.
Which value is actually measured in the pole center depends on the geometry of the
magnet.