
340 Handbook of Magnetic Measurements
A KH
H
H H
H
H H
t
x x
s
s
s
s
=
+
−
+
⎡
⎣
⎢
⎤
⎦
⎥
4 3
0
2 2
3
0
2 2 2
( )
sin ω
(6.5)
Thus, by using phase coherent demodulation and rotat-
ing elds in two planes, it is possible to separate all three
components of the measured eld.
The measurement of the magnetic eld in spacecrafts
is a challenge for designers. If we need to measure the
magnetic eld with resolution of 0.01 nT, it is a signicant
problem to eliminate the stray internal eld of electronic
devices and spacecraft metal parts (especially ferromag-
netic ones). Commonly, the sensors are placed away
from the main body on the boom with length 8–10 m.
Moreover, the whol ...