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Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
book

Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition

by John G. Webster, Halit Eren
February 2014
Intermediate to advanced content levelIntermediate to advanced
1921 pages
82h 13m
English
CRC Press
Content preview from Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
42-11Frequency Measurement
oscillators are oen found in telecommunication networks and as time base oscillators in test and mea-
surement
eq
uipment
. e
y
op
erate
at 6,
834,682,610
.90
4
Hz
,
th
e
re
sonance
fr
equency
of th
e
ru
bidium
ato
m
(
87
Rb), and use the rubidium frequency to control the frequency of a quartz oscillator. A micro-
wave
sig
nal
de
rived
fr
om
th
e
cr
ystal
os
cillator
is ap
plied
to th
e
87
Rb vapor within a cell, forcing the
ato
ms
in
to
a pa
rticular
en
ergy
st
ate
. An opt
ical
be
am
is th
en
pu
mped
in
to
th
e
ce
ll
an
d
is ab
sorbed
by
th
e
ato
ms
as it fo
rces
th
em
in
to
a se
parate
en
ergy
st
ate
. A ph
otocell
de
tector
me
asures
ho
w
mu
ch
of
th
e
be
am
is ab
sorbe ...
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Publisher Resources

ISBN: 9781439848913