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ferromagnetic I-Process |
impurities I-Process |
in O |
non-magnetic O |
metallic O |
materials O |
is O |
based O |
on O |
their O |
remanence O |
. O |
Before O |
such O |
a O |
measurement B-Task |
can O |
be O |
carried O |
out O |
, O |
the O |
aeroengine O |
turbine O |
disks O |
are O |
premagnetised B-Process |
in O |
axial O |
direction O |
. O |
As O |
ferromagnetic O |
materials O |
show O |
the O |
well-known O |
hysteresis B-Process |
behaviour I-Process |
, O |
those O |
materials O |
can O |
be O |
magnetised O |
by O |
a O |
strong B-Process |
magnetic I-Process |
field I-Process |
which O |
drives O |
the O |
magnetic O |
material O |
into O |
saturation O |
. O |
When O |
removing B-Process |
the I-Process |
magnetic I-Process |
field I-Process |
, O |
the O |
remanence O |
is O |
left O |
. O |
This O |
remaining B-Process |
flux I-Process |
density I-Process |
is O |
used O |
to O |
detect O |
them O |
in O |
non-magnetic O |
materials O |
. O |
Although O |
the O |
presented O |
model O |
is O |
developed O |
and O |
tested O |
with O |
a-C B-Material |
: I-Material |
H I-Material |
layers I-Material |
in O |
mind O |
, O |
it O |