
39-11Magnetic Field Measurement
e inductance of the rod antenna can be computed using the following equations:
L
n d t l
l
=
+
µ µ π
0
2 2
4
e w
c
( )
(3
9
.25
)
µ µ
e
c
a
w
c
= +
+
−
1 1
2
d
d t
f
l
l
(3
9
.26
)
f
l
l
l
l
l
l
w
c
w
c
w
c
= −
−
+1 9088 0 8672 1 1217 0 82
2
. . . . 663
3
l
l
w
c
(3
9
.27
)
e
fu
nction
f(l
w
/l
c
) accounts for the variation in ux density from the middle of the winding to its ends
an
d
a
ssumes
t
he
w
inding
i
s
c
entered
a
bout
t
he
m
iddle
o
f
t
he
c
ore
.
Eq
uations
3
9
.15 a
nd
3
9
.16 c
an
b
e
u
sed
to c
ompute
t
he
r
esistance
a
nd
c
apacitance
o
f
a r
od
a
ntenna
.
39.2.4 Signal Conditioning
To be useful, the induction coil signal must be conditioned u