
13-6 Sensors and Sensor Technology
emeasurementwas carried out using a thermography system [1]. To understand the working prin-
ciple, the eect of uid mechanics and heat transfer should be reviewed. e mathematical theory for
th
is
pr
oblem
is di
scussed
la
ter
in th
is
ch
apter
. Fi
gure
13.6b il
lustrates
th
e
in
uence
of th
e
o
w
ov
er
th
e
te
mperature
di
stribution
.
Be
cause
th
e
ca
lorimetric
ma
ss
o
w
se
nsors
ar
e
se
nsitive
in lo
w-ow
ra
nges,
by
pass
de
signs
ha
ve
be
en
in
troduced
in or
der
to ma
ke
th
e
se
nsors
su
itable
fo
r
th
e
me
asurement
of la
rger
o
w
ra
nges
. e se
nsor
el
ement
is a sm
all
ca
pillary
tu
be
(u
sually
le
ss
th
an
3 mm in di
ameter)
. e
y
en
sure
la