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3D
1 D
2 D
a
b
x
x
x
x
ϕ
xx
y
y
y
y
x
x
x
y
y
y
ϕ
xy
Fig. 3.12
Polar diagrams of the phase tensor;
−
0
.
50
1D:
Z
=
4
−
2
i
[
Z
]
=
,
0
−
0
.
5
ske
−
ske
w
CBB
=
0
4
−
2
i
w
S
=
0
20
0
=
=
,
2D: [
Z
]
,[
]
0
−
1
+
2
i
0
ske
w
B
=
0
−
0
.
5
−
0
.
5
−
3
i
ske
w
S
=
0
ske
w
B
=
0
.
47
,
4
−
2
i
3D,a: [
Z
]
=
−
1
+
2
i
0
.
5
+
3
i
−
ske
2
.
53
−
3
.
47
3
◦
,
[
]
=
w
=
17
.
−
1
.
07
−
0
.
93
CBB
−
ske
0
.
5
−
3
i
4
−
2
i
w
S
=
0
.
63
3D,b: [
Z
]
=
44
,
−
1
+
2
i
0
.
1
−
i
ske
w
B
=
0
.
−
2
.
1
.
96
ske
w
CBB
=
19
.
15
◦
[
]
=
−
.
−
.
1
01
0
38
a regular oval with a well-defined waist. Its maximal and minimal diameters are as
large as doubled absolute value of the phases of the longitudinal and transverse (or
tangential and radial) regional impedances. They are oriented in the longitudinal and
transverse (or tangential and radial) directions. The
xy
-diagram looks like a flower
with four identical petals. The lines bisecting the angles between these petals are
oriented in the longitudinal and transverse (or tangential and radial) directions.
In the event of asymmetric three-dimensional regional structures, the regu-
lar form of phase-tensor polar diagrams is violated. In the quasi-symmetric case
(
ske
w
=
,
w
=
,
w
=
0
ske
0
ske
0) the 3D,a diagrams have petals of different
S
B
CBB
