
39-26 Electromagnetic Variables
and, therefore, is proportional to the magnetic eld strength. e optically pumped magnetometer
ca
n
be us
ed
to sa
mple
th
e
ma
gnetic
e
ld
at a mu
ch
hi
gher
ra
te
th
an
th
e
pr
oton
pr
ecession
ma
gne-
tometer
an
d
ge
nerally
ca
n
ac
hieve
a hi
gher
re
solution
. e sa
mple
ra
te
an
d
in
strument
re
solution
ar
e
in
terdependent
.
39.4.1 Proton Precession Magnetometer
e proton precession magnetometer works on the principle that a spinning nucleus, which has both
an
gular
mo
mentum
L
⃗
an
d
a ma
gnetic
mo
ment
μ
p
, will precess about a magnetic eld like a gyroscope,
as sh
own
in Fi
gure
39.22. e pr
ecession
fr
equency
ω
ρ
is proportional to the ...