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POZNANUNIVERSITYOFTECHNOLOGYACADEMICJOURNALS
No65
ElectricalEngineering
2011
MirosławWOŁOSZYN*
JacekŁUBKOWSKI*
MarekCHOMNICKI*
IMPLEMENTATIONOFLOCALIZATION
ANDIDENTIFICATIONOFFERROMAGNETICOBJECTS
ALGORITHMINLABVIEWENVIROMENT
1.INTRODUCTION
Theproblemwithdetectingdangerousobjectsisstillamatterofconcerntoday.
Oneofthemethodsofdetectingdangerousobjectsisthemagneticmethod[1].
Whilemeasuringamagneticfieldinthesurroundingofobjectswithferromagnetic
properties,itispossibletodetect,localizeandidentifysuchobject.
Themethodoflocalizationandidentificationofferromagneticobjectsproposed
bytheauthorshastheassumptionthatthedifference(1)betweenresultantvalueof
totalmagneticfluxdensityandmagneticfluxdensityoftheEarthisapproximately
equaltocomponentBzofobjectmagneticinduction.
B
±
B
T
-
B
E
(1)
where:BT-moduleofthetotalmagneticfluxdensity|BE+Bo|,
BE-Earth
magneticfluxdensity,Bo-objectmagneticfluxdensity.
Thisassumptionallowedauthorstoreceiveformulascharacterizingobject
location.Objectlocalizationandidentificationalgorithmeditedbytheauthoris
similartoalgorithm[3],butallformulaswheretheresultofnumericanalyzingof
thedifferenceofmagneticdipoleandusingtheapproximationmethod.
2.LOCALIZATIONANDIDENTIFICATION
OBJECTSALGORYTHM
Knowingtheextremedifferencevaluesitispossibletocomputeapproximated
angle
O
ave(Fig.1,Fig.2)valuefromtheequation:
O
ave
±
[
|
|
{
|
|
[
160
90
0
+
0
16
171
-
0
24
160
+
0
(
.
0
7
B
.
0
0
23
-
ln(
0
0
(
.
B
B
022
)
-
21
)
)
B
Ś
0
.
022
0
.
022
<
B
Ś
0
.
0475
(2)
0
.
0475
<
B
<
20
20
Ś
B
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*GdańskUniversityofTechnology.
