Goudsmit HGM09S, Руководство по эксплуатации

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Gaussmeter HGM09s Operating Instructions
Chapter 3 Gaussmeter Function
Page 13 / 75
3.2
3.2 3.2
3.2 Measurement
Measurement Measurement
Measurement D
D D
De
e e
etails
tails tails
tails
The used Hall probes contain a very small active semiconductor area ranging at approx.
100µm. The local resolution of this measuring method is thus rather high. Also note that
individual Hall probes measure one field component only.
3.2.1
3.2.1 3.2.1
3.2.1 Sample
Sample Sample
Sample Measurement
Measurement Measurement
Measurement with
with with
with a
a a
an
n n
n NdFeB Magnet
NdFeB Magnet NdFeB Magnet
NdFeB Magnet
Due to the high local resolution, the near-surface measurement with magnets may lead
to misinterpretations because of the large field-strength gradients.
Figure 3 Flux Line Characteristics of NdFeB Induction Disks
Figure 3 shows an NdFeB magnet with a material remanence of 1400mT. In this exam-
ple the magnetic disk has a thickness of 5mm with a diameter of 20mm. The magnet is
supposed to be measured in 1mm distance from the surface.