48-16 Optical
e complete analysis of a uorescent material requires that the emittance be separated from the
re
ectance
. Sp
ectrouorimeters
we
re
de
signed
to an
alyze
u
orescent
sa
mples
. e
se
in
struments
il
luminate
th
e
sa
mple
wi
th
mo
nochromatic
li
ght
. Re
ected
an
d
em
itted
ra
ys
pa
ss
th
rough
a se
cond
mo
nochromator
to is
olate
th
e
re
ceiver
wa
velengths
. By vi
ewing
th
e
sa
mple
at th
e
sa
me
wa
velength
as
it is il
luminated,
th
e
tr
ue
re
ectance
of th
e
sa
mple
ca
n
be de
termined
. Ei
ther
th
e
ex
citance
sp
ectra
or th
e
em
ittance
sp
ectra
ca
n
be st
udied
by se
tting
ea
ch
mo
nochromator
at di
erent
wa
velengths
.
Te
chniques
ha
ve
al
so
be
en
de
veloped
to co
rrect
sp
ectrophotometric
me
asurements
of u
orescent
samples [45,46].
48.8.2 Metallic and Pearlescent Samples
Mater ...