Teledyne 6200T - Sulfides Analyzer - Manual (Page 291)

6200T Total Sulfur Analyzer Principles of Operation
Teledyen Analytical Instruments 291
LA
M
P
OU
T
P
U
T
(A
rbi
trar
y U
nti
s)
10 5
10 4
10 2
2
0
2.5
3
0
7.6
481.1
10 3
10 1
1
100 200 300 400 500
WAVELENGTH (nm)
0
21
3.9
33
0.3
27
5
.6
SO
2
*
Fluorescent
Spectrum
LAMP OUT
P
UT
(Ar
bi
tra
ry
Un
tis
)
10 5
10 4
10 2
10 3
10 1
1
100 200 300 400 500
WAVELENGTH (nm)
0
2
13.9
33
0.3
SO
2
* FLUORESCENT
SPECTRUM
UV SOURCE OPTICAL FILTER
BANDWIDTH
BEFORE AFTER
Figure 13-4: Excitation Lamp UV Spectrum Before/After Filtration
To solve this problem, the light emitted by the excitation UV lamp passes through a
band pass filter that screens out photons with wavelengths outside the spectrum required
to excite SO
2
into SO
2
* (refer to
Figure 13-4).